added all server files

1 files changed, 1718 insertions, 0 deletions

diff --git a/lib/python2.7/site-packages/django/contrib/admin/options.py b/lib/python2.7/site-packages/django/contrib/admin/options.py
new file mode 100644
index 0000000..9dddcb0
--- /dev/null
+++ b/lib/python2.7/site-packages/django/contrib/admin/options.py
@@ -0,0 +1,1718 @@
+import copy
+import operator
+from functools import partial, reduce, update_wrapper
+
+from django import forms
+from django.conf import settings
+from django.contrib import messages
+from django.contrib.admin import widgets, helpers
+from django.contrib.admin.util import (unquote, flatten_fieldsets, get_deleted_objects,
+    model_format_dict, NestedObjects, lookup_needs_distinct)
+from django.contrib.admin import validation
+from django.contrib.admin.templatetags.admin_static import static
+from django.contrib.admin.templatetags.admin_urls import add_preserved_filters
+from django.contrib.auth import get_permission_codename
+from django.contrib.contenttypes.models import ContentType
+from django.core.exceptions import PermissionDenied, ValidationError, FieldError
+from django.core.paginator import Paginator
+from django.core.urlresolvers import reverse
+from django.db import models, transaction, router
+from django.db.models.constants import LOOKUP_SEP
+from django.db.models.related import RelatedObject
+from django.db.models.fields import BLANK_CHOICE_DASH, FieldDoesNotExist
+from django.db.models.sql.constants import QUERY_TERMS
+from django.forms.formsets import all_valid, DELETION_FIELD_NAME
+from django.forms.models import (modelform_factory, modelformset_factory,
+    inlineformset_factory, BaseInlineFormSet, modelform_defines_fields)
+from django.http import Http404, HttpResponseRedirect
+from django.http.response import HttpResponseBase
+from django.shortcuts import get_object_or_404
+from django.template.response import SimpleTemplateResponse, TemplateResponse
+from django.utils.decorators import method_decorator
+from django.utils.datastructures import SortedDict
+from django.utils.html import escape, escapejs
+from django.utils.safestring import mark_safe
+from django.utils import six
+from django.utils.deprecation import RenameMethodsBase
+from django.utils.http import urlencode
+from django.utils.text import capfirst, get_text_list
+from django.utils.translation import ugettext as _
+from django.utils.translation import ungettext
+from django.utils.encoding import force_text
+from django.views.decorators.csrf import csrf_protect
+
+
+IS_POPUP_VAR = '_popup'
+
+HORIZONTAL, VERTICAL = 1, 2
+# returns the <ul> class for a given radio_admin field
+get_ul_class = lambda x: 'radiolist%s' % (' inline' if x == HORIZONTAL else '')
+
+
+class IncorrectLookupParameters(Exception):
+    pass
+
+# Defaults for formfield_overrides. ModelAdmin subclasses can change this
+# by adding to ModelAdmin.formfield_overrides.
+
+FORMFIELD_FOR_DBFIELD_DEFAULTS = {
+    models.DateTimeField: {
+        'form_class': forms.SplitDateTimeField,
+        'widget': widgets.AdminSplitDateTime
+    },
+    models.DateField: {'widget': widgets.AdminDateWidget},
+    models.TimeField: {'widget': widgets.AdminTimeWidget},
+    models.TextField: {'widget': widgets.AdminTextareaWidget},
+    models.URLField: {'widget': widgets.AdminURLFieldWidget},
+    models.IntegerField: {'widget': widgets.AdminIntegerFieldWidget},
+    models.BigIntegerField: {'widget': widgets.AdminBigIntegerFieldWidget},
+    models.CharField: {'widget': widgets.AdminTextInputWidget},
+    models.ImageField: {'widget': widgets.AdminFileWidget},
+    models.FileField: {'widget': widgets.AdminFileWidget},
+    models.EmailField: {'widget': widgets.AdminEmailInputWidget},
+}
+
+csrf_protect_m = method_decorator(csrf_protect)
+
+
+class RenameBaseModelAdminMethods(forms.MediaDefiningClass, RenameMethodsBase):
+    renamed_methods = (
+        ('queryset', 'get_queryset', PendingDeprecationWarning),
+    )
+
+
+class BaseModelAdmin(six.with_metaclass(RenameBaseModelAdminMethods)):
+    """Functionality common to both ModelAdmin and InlineAdmin."""
+
+    raw_id_fields = ()
+    fields = None
+    exclude = None
+    fieldsets = None
+    form = forms.ModelForm
+    filter_vertical = ()
+    filter_horizontal = ()
+    radio_fields = {}
+    prepopulated_fields = {}
+    formfield_overrides = {}
+    readonly_fields = ()
+    ordering = None
+
+    # validation
+    validator_class = validation.BaseValidator
+
+    @classmethod
+    def validate(cls, model):
+        validator = cls.validator_class()
+        validator.validate(cls, model)
+
+    def __init__(self):
+        overrides = FORMFIELD_FOR_DBFIELD_DEFAULTS.copy()
+        overrides.update(self.formfield_overrides)
+        self.formfield_overrides = overrides
+
+    def formfield_for_dbfield(self, db_field, **kwargs):
+        """
+        Hook for specifying the form Field instance for a given database Field
+        instance.
+
+        If kwargs are given, they're passed to the form Field's constructor.
+        """
+        request = kwargs.pop("request", None)
+
+        # If the field specifies choices, we don't need to look for special
+        # admin widgets - we just need to use a select widget of some kind.
+        if db_field.choices:
+            return self.formfield_for_choice_field(db_field, request, **kwargs)
+
+        # ForeignKey or ManyToManyFields
+        if isinstance(db_field, (models.ForeignKey, models.ManyToManyField)):
+            # Combine the field kwargs with any options for formfield_overrides.
+            # Make sure the passed in **kwargs override anything in
+            # formfield_overrides because **kwargs is more specific, and should
+            # always win.
+            if db_field.__class__ in self.formfield_overrides:
+                kwargs = dict(self.formfield_overrides[db_field.__class__], **kwargs)
+
+            # Get the correct formfield.
+            if isinstance(db_field, models.ForeignKey):
+                formfield = self.formfield_for_foreignkey(db_field, request, **kwargs)
+            elif isinstance(db_field, models.ManyToManyField):
+                formfield = self.formfield_for_manytomany(db_field, request, **kwargs)
+
+            # For non-raw_id fields, wrap the widget with a wrapper that adds
+            # extra HTML -- the "add other" interface -- to the end of the
+            # rendered output. formfield can be None if it came from a
+            # OneToOneField with parent_link=True or a M2M intermediary.
+            if formfield and db_field.name not in self.raw_id_fields:
+                related_modeladmin = self.admin_site._registry.get(
+                                                            db_field.rel.to)
+                can_add_related = bool(related_modeladmin and
+                            related_modeladmin.has_add_permission(request))
+                formfield.widget = widgets.RelatedFieldWidgetWrapper(
+                            formfield.widget, db_field.rel, self.admin_site,
+                            can_add_related=can_add_related)
+
+            return formfield
+
+        # If we've got overrides for the formfield defined, use 'em. **kwargs
+        # passed to formfield_for_dbfield override the defaults.
+        for klass in db_field.__class__.mro():
+            if klass in self.formfield_overrides:
+                kwargs = dict(copy.deepcopy(self.formfield_overrides[klass]), **kwargs)
+                return db_field.formfield(**kwargs)
+
+        # For any other type of field, just call its formfield() method.
+        return db_field.formfield(**kwargs)
+
+    def formfield_for_choice_field(self, db_field, request=None, **kwargs):
+        """
+        Get a form Field for a database Field that has declared choices.
+        """
+        # If the field is named as a radio_field, use a RadioSelect
+        if db_field.name in self.radio_fields:
+            # Avoid stomping on custom widget/choices arguments.
+            if 'widget' not in kwargs:
+                kwargs['widget'] = widgets.AdminRadioSelect(attrs={
+                    'class': get_ul_class(self.radio_fields[db_field.name]),
+                })
+            if 'choices' not in kwargs:
+                kwargs['choices'] = db_field.get_choices(
+                    include_blank=db_field.blank,
+                    blank_choice=[('', _('None'))]
+                )
+        return db_field.formfield(**kwargs)
+
+    def get_field_queryset(self, db, db_field, request):
+        """
+        If the ModelAdmin specifies ordering, the queryset should respect that
+        ordering.  Otherwise don't specify the queryset, let the field decide
+        (returns None in that case).
+        """
+        related_admin = self.admin_site._registry.get(db_field.rel.to, None)
+        if related_admin is not None:
+            ordering = related_admin.get_ordering(request)
+            if ordering is not None and ordering != ():
+                return db_field.rel.to._default_manager.using(db).order_by(*ordering).complex_filter(db_field.rel.limit_choices_to)
+        return None
+
+    def formfield_for_foreignkey(self, db_field, request=None, **kwargs):
+        """
+        Get a form Field for a ForeignKey.
+        """
+        db = kwargs.get('using')
+        if db_field.name in self.raw_id_fields:
+            kwargs['widget'] = widgets.ForeignKeyRawIdWidget(db_field.rel,
+                                    self.admin_site, using=db)
+        elif db_field.name in self.radio_fields:
+            kwargs['widget'] = widgets.AdminRadioSelect(attrs={
+                'class': get_ul_class(self.radio_fields[db_field.name]),
+            })
+            kwargs['empty_label'] = _('None') if db_field.blank else None
+
+        if not 'queryset' in kwargs:
+            queryset = self.get_field_queryset(db, db_field, request)
+            if queryset is not None:
+                kwargs['queryset'] = queryset
+
+        return db_field.formfield(**kwargs)
+
+    def formfield_for_manytomany(self, db_field, request=None, **kwargs):
+        """
+        Get a form Field for a ManyToManyField.
+        """
+        # If it uses an intermediary model that isn't auto created, don't show
+        # a field in admin.
+        if not db_field.rel.through._meta.auto_created:
+            return None
+        db = kwargs.get('using')
+
+        if db_field.name in self.raw_id_fields:
+            kwargs['widget'] = widgets.ManyToManyRawIdWidget(db_field.rel,
+                                    self.admin_site, using=db)
+            kwargs['help_text'] = ''
+        elif db_field.name in (list(self.filter_vertical) + list(self.filter_horizontal)):
+            kwargs['widget'] = widgets.FilteredSelectMultiple(db_field.verbose_name, (db_field.name in self.filter_vertical))
+
+        if not 'queryset' in kwargs:
+            queryset = self.get_field_queryset(db, db_field, request)
+            if queryset is not None:
+                kwargs['queryset'] = queryset
+
+        return db_field.formfield(**kwargs)
+
+    def _declared_fieldsets(self):
+        if self.fieldsets:
+            return self.fieldsets
+        elif self.fields:
+            return [(None, {'fields': self.fields})]
+        return None
+    declared_fieldsets = property(_declared_fieldsets)
+
+    def get_ordering(self, request):
+        """
+        Hook for specifying field ordering.
+        """
+        return self.ordering or ()  # otherwise we might try to *None, which is bad ;)
+
+    def get_readonly_fields(self, request, obj=None):
+        """
+        Hook for specifying custom readonly fields.
+        """
+        return self.readonly_fields
+
+    def get_prepopulated_fields(self, request, obj=None):
+        """
+        Hook for specifying custom prepopulated fields.
+        """
+        return self.prepopulated_fields
+
+    def get_queryset(self, request):
+        """
+        Returns a QuerySet of all model instances that can be edited by the
+        admin site. This is used by changelist_view.
+        """
+        qs = self.model._default_manager.get_queryset()
+        # TODO: this should be handled by some parameter to the ChangeList.
+        ordering = self.get_ordering(request)
+        if ordering:
+            qs = qs.order_by(*ordering)
+        return qs
+
+    def lookup_allowed(self, lookup, value):
+        model = self.model
+        # Check FKey lookups that are allowed, so that popups produced by
+        # ForeignKeyRawIdWidget, on the basis of ForeignKey.limit_choices_to,
+        # are allowed to work.
+        for l in model._meta.related_fkey_lookups:
+            for k, v in widgets.url_params_from_lookup_dict(l).items():
+                if k == lookup and v == value:
+                    return True
+
+        parts = lookup.split(LOOKUP_SEP)
+
+        # Last term in lookup is a query term (__exact, __startswith etc)
+        # This term can be ignored.
+        if len(parts) > 1 and parts[-1] in QUERY_TERMS:
+            parts.pop()
+
+        # Special case -- foo__id__exact and foo__id queries are implied
+        # if foo has been specifically included in the lookup list; so
+        # drop __id if it is the last part. However, first we need to find
+        # the pk attribute name.
+        rel_name = None
+        for part in parts[:-1]:
+            try:
+                field, _, _, _ = model._meta.get_field_by_name(part)
+            except FieldDoesNotExist:
+                # Lookups on non-existent fields are ok, since they're ignored
+                # later.
+                return True
+            if hasattr(field, 'rel'):
+                if field.rel is None:
+                    # This property or relation doesn't exist, but it's allowed
+                    # since it's ignored in ChangeList.get_filters().
+                    return True
+                model = field.rel.to
+                rel_name = field.rel.get_related_field().name
+            elif isinstance(field, RelatedObject):
+                model = field.model
+                rel_name = model._meta.pk.name
+            else:
+                rel_name = None
+        if rel_name and len(parts) > 1 and parts[-1] == rel_name:
+            parts.pop()
+
+        if len(parts) == 1:
+            return True
+        clean_lookup = LOOKUP_SEP.join(parts)
+        return clean_lookup in self.list_filter or clean_lookup == self.date_hierarchy
+
+    def has_add_permission(self, request):
+        """
+        Returns True if the given request has permission to add an object.
+        Can be overridden by the user in subclasses.
+        """
+        opts = self.opts
+        codename = get_permission_codename('add', opts)
+        return request.user.has_perm("%s.%s" % (opts.app_label, codename))
+
+    def has_change_permission(self, request, obj=None):
+        """
+        Returns True if the given request has permission to change the given
+        Django model instance, the default implementation doesn't examine the
+        `obj` parameter.
+
+        Can be overridden by the user in subclasses. In such case it should
+        return True if the given request has permission to change the `obj`
+        model instance. If `obj` is None, this should return True if the given
+        request has permission to change *any* object of the given type.
+        """
+        opts = self.opts
+        codename = get_permission_codename('change', opts)
+        return request.user.has_perm("%s.%s" % (opts.app_label, codename))
+
+    def has_delete_permission(self, request, obj=None):
+        """
+        Returns True if the given request has permission to change the given
+        Django model instance, the default implementation doesn't examine the
+        `obj` parameter.
+
+        Can be overridden by the user in subclasses. In such case it should
+        return True if the given request has permission to delete the `obj`
+        model instance. If `obj` is None, this should return True if the given
+        request has permission to delete *any* object of the given type.
+        """
+        opts = self.opts
+        codename = get_permission_codename('delete', opts)
+        return request.user.has_perm("%s.%s" % (opts.app_label, codename))
+
+
+class ModelAdmin(BaseModelAdmin):
+    "Encapsulates all admin options and functionality for a given model."
+
+    list_display = ('__str__',)
+    list_display_links = ()
+    list_filter = ()
+    list_select_related = False
+    list_per_page = 100
+    list_max_show_all = 200
+    list_editable = ()
+    search_fields = ()
+    date_hierarchy = None
+    save_as = False
+    save_on_top = False
+    paginator = Paginator
+    preserve_filters = True
+    inlines = []
+
+    # Custom templates (designed to be over-ridden in subclasses)
+    add_form_template = None
+    change_form_template = None
+    change_list_template = None
+    delete_confirmation_template = None
+    delete_selected_confirmation_template = None
+    object_history_template = None
+
+    # Actions
+    actions = []
+    action_form = helpers.ActionForm
+    actions_on_top = True
+    actions_on_bottom = False
+    actions_selection_counter = True
+
+    # validation
+    validator_class = validation.ModelAdminValidator
+
+    def __init__(self, model, admin_site):
+        self.model = model
+        self.opts = model._meta
+        self.admin_site = admin_site
+        super(ModelAdmin, self).__init__()
+
+    def get_inline_instances(self, request, obj=None):
+        inline_instances = []
+        for inline_class in self.inlines:
+            inline = inline_class(self.model, self.admin_site)
+            if request:
+                if not (inline.has_add_permission(request) or
+                        inline.has_change_permission(request, obj) or
+                        inline.has_delete_permission(request, obj)):
+                    continue
+                if not inline.has_add_permission(request):
+                    inline.max_num = 0
+            inline_instances.append(inline)
+
+        return inline_instances
+
+    def get_urls(self):
+        from django.conf.urls import patterns, url
+
+        def wrap(view):
+            def wrapper(*args, **kwargs):
+                return self.admin_site.admin_view(view)(*args, **kwargs)
+            return update_wrapper(wrapper, view)
+
+        info = self.model._meta.app_label, self.model._meta.model_name
+
+        urlpatterns = patterns('',
+            url(r'^$',
+                wrap(self.changelist_view),
+                name='%s_%s_changelist' % info),
+            url(r'^add/$',
+                wrap(self.add_view),
+                name='%s_%s_add' % info),
+            url(r'^(.+)/history/$',
+                wrap(self.history_view),
+                name='%s_%s_history' % info),
+            url(r'^(.+)/delete/$',
+                wrap(self.delete_view),
+                name='%s_%s_delete' % info),
+            url(r'^(.+)/$',
+                wrap(self.change_view),
+                name='%s_%s_change' % info),
+        )
+        return urlpatterns
+
+    def urls(self):
+        return self.get_urls()
+    urls = property(urls)
+
+    @property
+    def media(self):
+        extra = '' if settings.DEBUG else '.min'
+        js = [
+            'core.js',
+            'admin/RelatedObjectLookups.js',
+            'jquery%s.js' % extra,
+            'jquery.init.js'
+        ]
+        if self.actions is not None:
+            js.append('actions%s.js' % extra)
+        if self.prepopulated_fields:
+            js.extend(['urlify.js', 'prepopulate%s.js' % extra])
+        return forms.Media(js=[static('admin/js/%s' % url) for url in js])
+
+    def get_model_perms(self, request):
+        """
+        Returns a dict of all perms for this model. This dict has the keys
+        ``add``, ``change``, and ``delete`` mapping to the True/False for each
+        of those actions.
+        """
+        return {
+            'add': self.has_add_permission(request),
+            'change': self.has_change_permission(request),
+            'delete': self.has_delete_permission(request),
+        }
+
+    def get_fieldsets(self, request, obj=None):
+        "Hook for specifying fieldsets for the add form."
+        if self.declared_fieldsets:
+            return self.declared_fieldsets
+        form = self.get_form(request, obj, fields=None)
+        fields = list(form.base_fields) + list(self.get_readonly_fields(request, obj))
+        return [(None, {'fields': fields})]
+
+    def get_form(self, request, obj=None, **kwargs):
+        """
+        Returns a Form class for use in the admin add view. This is used by
+        add_view and change_view.
+        """
+        if 'fields' in kwargs:
+            fields = kwargs.pop('fields')
+        else:
+            fields = flatten_fieldsets(self.get_fieldsets(request, obj))
+        if self.exclude is None:
+            exclude = []
+        else:
+            exclude = list(self.exclude)
+        exclude.extend(self.get_readonly_fields(request, obj))
+        if self.exclude is None and hasattr(self.form, '_meta') and self.form._meta.exclude:
+            # Take the custom ModelForm's Meta.exclude into account only if the
+            # ModelAdmin doesn't define its own.
+            exclude.extend(self.form._meta.exclude)
+        # if exclude is an empty list we pass None to be consistent with the
+        # default on modelform_factory
+        exclude = exclude or None
+        defaults = {
+            "form": self.form,
+            "fields": fields,
+            "exclude": exclude,
+            "formfield_callback": partial(self.formfield_for_dbfield, request=request),
+        }
+        defaults.update(kwargs)
+
+        if defaults['fields'] is None and not modelform_defines_fields(defaults['form']):
+            defaults['fields'] = forms.ALL_FIELDS
+
+        try:
+            return modelform_factory(self.model, **defaults)
+        except FieldError as e:
+            raise FieldError('%s. Check fields/fieldsets/exclude attributes of class %s.'
+                             % (e, self.__class__.__name__))
+
+    def get_changelist(self, request, **kwargs):
+        """
+        Returns the ChangeList class for use on the changelist page.
+        """
+        from django.contrib.admin.views.main import ChangeList
+        return ChangeList
+
+    def get_object(self, request, object_id):
+        """
+        Returns an instance matching the primary key provided. ``None``  is
+        returned if no match is found (or the object_id failed validation
+        against the primary key field).
+        """
+        queryset = self.get_queryset(request)
+        model = queryset.model
+        try:
+            object_id = model._meta.pk.to_python(object_id)
+            return queryset.get(pk=object_id)
+        except (model.DoesNotExist, ValidationError, ValueError):
+            return None
+
+    def get_changelist_form(self, request, **kwargs):
+        """
+        Returns a Form class for use in the Formset on the changelist page.
+        """
+        defaults = {
+            "formfield_callback": partial(self.formfield_for_dbfield, request=request),
+        }
+        defaults.update(kwargs)
+        if (defaults.get('fields') is None
+            and not modelform_defines_fields(defaults.get('form'))):
+            defaults['fields'] = forms.ALL_FIELDS
+
+        return modelform_factory(self.model, **defaults)
+
+    def get_changelist_formset(self, request, **kwargs):
+        """
+        Returns a FormSet class for use on the changelist page if list_editable
+        is used.
+        """
+        defaults = {
+            "formfield_callback": partial(self.formfield_for_dbfield, request=request),
+        }
+        defaults.update(kwargs)
+        return modelformset_factory(self.model,
+            self.get_changelist_form(request), extra=0,
+            fields=self.list_editable, **defaults)
+
+    def get_formsets(self, request, obj=None):
+        for inline in self.get_inline_instances(request, obj):
+            yield inline.get_formset(request, obj)
+
+    def get_paginator(self, request, queryset, per_page, orphans=0, allow_empty_first_page=True):
+        return self.paginator(queryset, per_page, orphans, allow_empty_first_page)
+
+    def log_addition(self, request, object):
+        """
+        Log that an object has been successfully added.
+
+        The default implementation creates an admin LogEntry object.
+        """
+        from django.contrib.admin.models import LogEntry, ADDITION
+        LogEntry.objects.log_action(
+            user_id=request.user.pk,
+            content_type_id=ContentType.objects.get_for_model(object).pk,
+            object_id=object.pk,
+            object_repr=force_text(object),
+            action_flag=ADDITION
+        )
+
+    def log_change(self, request, object, message):
+        """
+        Log that an object has been successfully changed.
+
+        The default implementation creates an admin LogEntry object.
+        """
+        from django.contrib.admin.models import LogEntry, CHANGE
+        LogEntry.objects.log_action(
+            user_id=request.user.pk,
+            content_type_id=ContentType.objects.get_for_model(object).pk,
+            object_id=object.pk,
+            object_repr=force_text(object),
+            action_flag=CHANGE,
+            change_message=message
+        )
+
+    def log_deletion(self, request, object, object_repr):
+        """
+        Log that an object will be deleted. Note that this method is called
+        before the deletion.
+
+        The default implementation creates an admin LogEntry object.
+        """
+        from django.contrib.admin.models import LogEntry, DELETION
+        LogEntry.objects.log_action(
+            user_id=request.user.pk,
+            content_type_id=ContentType.objects.get_for_model(self.model).pk,
+            object_id=object.pk,
+            object_repr=object_repr,
+            action_flag=DELETION
+        )
+
+    def action_checkbox(self, obj):
+        """
+        A list_display column containing a checkbox widget.
+        """
+        return helpers.checkbox.render(helpers.ACTION_CHECKBOX_NAME, force_text(obj.pk))
+    action_checkbox.short_description = mark_safe('<input type="checkbox" id="action-toggle" />')
+    action_checkbox.allow_tags = True
+
+    def get_actions(self, request):
+        """
+        Return a dictionary mapping the names of all actions for this
+        ModelAdmin to a tuple of (callable, name, description) for each action.
+        """
+        # If self.actions is explicitly set to None that means that we don't
+        # want *any* actions enabled on this page.
+        from django.contrib.admin.views.main import _is_changelist_popup
+        if self.actions is None or _is_changelist_popup(request):
+            return SortedDict()
+
+        actions = []
+
+        # Gather actions from the admin site first
+        for (name, func) in self.admin_site.actions:
+            description = getattr(func, 'short_description', name.replace('_', ' '))
+            actions.append((func, name, description))
+
+        # Then gather them from the model admin and all parent classes,
+        # starting with self and working back up.
+        for klass in self.__class__.mro()[::-1]:
+            class_actions = getattr(klass, 'actions', [])
+            # Avoid trying to iterate over None
+            if not class_actions:
+                continue
+            actions.extend([self.get_action(action) for action in class_actions])
+
+        # get_action might have returned None, so filter any of those out.
+        actions = filter(None, actions)
+
+        # Convert the actions into a SortedDict keyed by name.
+        actions = SortedDict([
+            (name, (func, name, desc))
+            for func, name, desc in actions
+        ])
+
+        return actions
+
+    def get_action_choices(self, request, default_choices=BLANK_CHOICE_DASH):
+        """
+        Return a list of choices for use in a form object.  Each choice is a
+        tuple (name, description).
+        """
+        choices = [] + default_choices
+        for func, name, description in six.itervalues(self.get_actions(request)):
+            choice = (name, description % model_format_dict(self.opts))
+            choices.append(choice)
+        return choices
+
+    def get_action(self, action):
+        """
+        Return a given action from a parameter, which can either be a callable,
+        or the name of a method on the ModelAdmin.  Return is a tuple of
+        (callable, name, description).
+        """
+        # If the action is a callable, just use it.
+        if callable(action):
+            func = action
+            action = action.__name__
+
+        # Next, look for a method. Grab it off self.__class__ to get an unbound
+        # method instead of a bound one; this ensures that the calling
+        # conventions are the same for functions and methods.
+        elif hasattr(self.__class__, action):
+            func = getattr(self.__class__, action)
+
+        # Finally, look for a named method on the admin site
+        else:
+            try:
+                func = self.admin_site.get_action(action)
+            except KeyError:
+                return None
+
+        if hasattr(func, 'short_description'):
+            description = func.short_description
+        else:
+            description = capfirst(action.replace('_', ' '))
+        return func, action, description
+
+    def get_list_display(self, request):
+        """
+        Return a sequence containing the fields to be displayed on the
+        changelist.
+        """
+        return self.list_display
+
+    def get_list_display_links(self, request, list_display):
+        """
+        Return a sequence containing the fields to be displayed as links
+        on the changelist. The list_display parameter is the list of fields
+        returned by get_list_display().
+        """
+        if self.list_display_links or not list_display:
+            return self.list_display_links
+        else:
+            # Use only the first item in list_display as link
+            return list(list_display)[:1]
+
+    def get_list_filter(self, request):
+        """
+        Returns a sequence containing the fields to be displayed as filters in
+        the right sidebar of the changelist page.
+        """
+        return self.list_filter
+
+    def get_search_results(self, request, queryset, search_term):
+        """
+        Returns a tuple containing a queryset to implement the search,
+        and a boolean indicating if the results may contain duplicates.
+        """
+        # Apply keyword searches.
+        def construct_search(field_name):
+            if field_name.startswith('^'):
+                return "%s__istartswith" % field_name[1:]
+            elif field_name.startswith('='):
+                return "%s__iexact" % field_name[1:]
+            elif field_name.startswith('@'):
+                return "%s__search" % field_name[1:]
+            else:
+                return "%s__icontains" % field_name
+
+        use_distinct = False
+        if self.search_fields and search_term:
+            orm_lookups = [construct_search(str(search_field))
+                           for search_field in self.search_fields]
+            for bit in search_term.split():
+                or_queries = [models.Q(**{orm_lookup: bit})
+                              for orm_lookup in orm_lookups]
+                queryset = queryset.filter(reduce(operator.or_, or_queries))
+            if not use_distinct:
+                for search_spec in orm_lookups:
+                    if lookup_needs_distinct(self.opts, search_spec):
+                        use_distinct = True
+                        break
+
+        return queryset, use_distinct
+
+    def get_preserved_filters(self, request):
+        """
+        Returns the preserved filters querystring.
+        """
+        match = request.resolver_match
+        if self.preserve_filters and match:
+            opts = self.model._meta
+            current_url = '%s:%s' % (match.app_name, match.url_name)
+            changelist_url = 'admin:%s_%s_changelist' % (opts.app_label, opts.model_name)
+            if current_url == changelist_url:
+                preserved_filters = request.GET.urlencode()
+            else:
+                preserved_filters = request.GET.get('_changelist_filters')
+
+            if preserved_filters:
+                return urlencode({'_changelist_filters': preserved_filters})
+        return ''
+
+    def construct_change_message(self, request, form, formsets):
+        """
+        Construct a change message from a changed object.
+        """
+        change_message = []
+        if form.changed_data:
+            change_message.append(_('Changed %s.') % get_text_list(form.changed_data, _('and')))
+
+        if formsets:
+            for formset in formsets:
+                for added_object in formset.new_objects:
+                    change_message.append(_('Added %(name)s "%(object)s".')
+                                          % {'name': force_text(added_object._meta.verbose_name),
+                                             'object': force_text(added_object)})
+                for changed_object, changed_fields in formset.changed_objects:
+                    change_message.append(_('Changed %(list)s for %(name)s "%(object)s".')
+                                          % {'list': get_text_list(changed_fields, _('and')),
+                                             'name': force_text(changed_object._meta.verbose_name),
+                                             'object': force_text(changed_object)})
+                for deleted_object in formset.deleted_objects:
+                    change_message.append(_('Deleted %(name)s "%(object)s".')
+                                          % {'name': force_text(deleted_object._meta.verbose_name),
+                                             'object': force_text(deleted_object)})
+        change_message = ' '.join(change_message)
+        return change_message or _('No fields changed.')
+
+    def message_user(self, request, message, level=messages.INFO, extra_tags='',
+                     fail_silently=False):
+        """
+        Send a message to the user. The default implementation
+        posts a message using the django.contrib.messages backend.
+
+        Exposes almost the same API as messages.add_message(), but accepts the
+        positional arguments in a different order to maintain backwards
+        compatibility. For convenience, it accepts the `level` argument as
+        a string rather than the usual level number.
+        """
+
+        if not isinstance(level, int):
+            # attempt to get the level if passed a string
+            try:
+                level = getattr(messages.constants, level.upper())
+            except AttributeError:
+                levels = messages.constants.DEFAULT_TAGS.values()
+                levels_repr = ', '.join('`%s`' % l for l in levels)
+                raise ValueError('Bad message level string: `%s`. '
+                        'Possible values are: %s' % (level, levels_repr))
+
+        messages.add_message(request, level, message, extra_tags=extra_tags,
+                fail_silently=fail_silently)
+
+    def save_form(self, request, form, change):
+        """
+        Given a ModelForm return an unsaved instance. ``change`` is True if
+        the object is being changed, and False if it's being added.
+        """
+        return form.save(commit=False)
+
+    def save_model(self, request, obj, form, change):
+        """
+        Given a model instance save it to the database.
+        """
+        obj.save()
+
+    def delete_model(self, request, obj):
+        """
+        Given a model instance delete it from the database.
+        """
+        obj.delete()
+
+    def save_formset(self, request, form, formset, change):
+        """
+        Given an inline formset save it to the database.
+        """
+        formset.save()
+
+    def save_related(self, request, form, formsets, change):
+        """
+        Given the ``HttpRequest``, the parent ``ModelForm`` instance, the
+        list of inline formsets and a boolean value based on whether the
+        parent is being added or changed, save the related objects to the
+        database. Note that at this point save_form() and save_model() have
+        already been called.
+        """
+        form.save_m2m()
+        for formset in formsets:
+            self.save_formset(request, form, formset, change=change)
+
+    def render_change_form(self, request, context, add=False, change=False, form_url='', obj=None):
+        opts = self.model._meta
+        app_label = opts.app_label
+        preserved_filters = self.get_preserved_filters(request)
+        form_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, form_url)
+        context.update({
+            'add': add,
+            'change': change,
+            'has_add_permission': self.has_add_permission(request),
+            'has_change_permission': self.has_change_permission(request, obj),
+            'has_delete_permission': self.has_delete_permission(request, obj),
+            'has_file_field': True,  # FIXME - this should check if form or formsets have a FileField,
+            'has_absolute_url': hasattr(self.model, 'get_absolute_url'),
+            'form_url': form_url,
+            'opts': opts,
+            'content_type_id': ContentType.objects.get_for_model(self.model).id,
+            'save_as': self.save_as,
+            'save_on_top': self.save_on_top,
+        })
+        if add and self.add_form_template is not None:
+            form_template = self.add_form_template
+        else:
+            form_template = self.change_form_template
+
+        return TemplateResponse(request, form_template or [
+            "admin/%s/%s/change_form.html" % (app_label, opts.model_name),
+            "admin/%s/change_form.html" % app_label,
+            "admin/change_form.html"
+        ], context, current_app=self.admin_site.name)
+
+    def response_add(self, request, obj, post_url_continue=None):
+        """
+        Determines the HttpResponse for the add_view stage.
+        """
+        opts = obj._meta
+        pk_value = obj._get_pk_val()
+        preserved_filters = self.get_preserved_filters(request)
+
+        msg_dict = {'name': force_text(opts.verbose_name), 'obj': force_text(obj)}
+        # Here, we distinguish between different save types by checking for
+        # the presence of keys in request.POST.
+        if IS_POPUP_VAR in request.POST:
+            return SimpleTemplateResponse('admin/popup_response.html', {
+                'pk_value': escape(pk_value),
+                'obj': escapejs(obj)
+            })
+
+        elif "_continue" in request.POST:
+            msg = _('The %(name)s "%(obj)s" was added successfully. You may edit it again below.') % msg_dict
+            self.message_user(request, msg, messages.SUCCESS)
+            if post_url_continue is None:
+                post_url_continue = reverse('admin:%s_%s_change' %
+                                            (opts.app_label, opts.model_name),
+                                            args=(pk_value,),
+                                            current_app=self.admin_site.name)
+            post_url_continue = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, post_url_continue)
+            return HttpResponseRedirect(post_url_continue)
+
+        elif "_addanother" in request.POST:
+            msg = _('The %(name)s "%(obj)s" was added successfully. You may add another %(name)s below.') % msg_dict
+            self.message_user(request, msg, messages.SUCCESS)
+            redirect_url = request.path
+            redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
+            return HttpResponseRedirect(redirect_url)
+
+        else:
+            msg = _('The %(name)s "%(obj)s" was added successfully.') % msg_dict
+            self.message_user(request, msg, messages.SUCCESS)
+            return self.response_post_save_add(request, obj)
+
+    def response_change(self, request, obj):
+        """
+        Determines the HttpResponse for the change_view stage.
+        """
+        opts = self.model._meta
+        pk_value = obj._get_pk_val()
+        preserved_filters = self.get_preserved_filters(request)
+
+        msg_dict = {'name': force_text(opts.verbose_name), 'obj': force_text(obj)}
+        if "_continue" in request.POST:
+            msg = _('The %(name)s "%(obj)s" was changed successfully. You may edit it again below.') % msg_dict
+            self.message_user(request, msg, messages.SUCCESS)
+            redirect_url = request.path
+            redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
+            return HttpResponseRedirect(redirect_url)
+
+        elif "_saveasnew" in request.POST:
+            msg = _('The %(name)s "%(obj)s" was added successfully. You may edit it again below.') % msg_dict
+            self.message_user(request, msg, messages.SUCCESS)
+            redirect_url = reverse('admin:%s_%s_change' %
+                                   (opts.app_label, opts.model_name),
+                                   args=(pk_value,),
+                                   current_app=self.admin_site.name)
+            redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
+            return HttpResponseRedirect(redirect_url)
+
+        elif "_addanother" in request.POST:
+            msg = _('The %(name)s "%(obj)s" was changed successfully. You may add another %(name)s below.') % msg_dict
+            self.message_user(request, msg, messages.SUCCESS)
+            redirect_url = reverse('admin:%s_%s_add' %
+                                   (opts.app_label, opts.model_name),
+                                   current_app=self.admin_site.name)
+            redirect_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, redirect_url)
+            return HttpResponseRedirect(redirect_url)
+
+        else:
+            msg = _('The %(name)s "%(obj)s" was changed successfully.') % msg_dict
+            self.message_user(request, msg, messages.SUCCESS)
+            return self.response_post_save_change(request, obj)
+
+    def response_post_save_add(self, request, obj):
+        """
+        Figure out where to redirect after the 'Save' button has been pressed
+        when adding a new object.
+        """
+        opts = self.model._meta
+        if self.has_change_permission(request, None):
+            post_url = reverse('admin:%s_%s_changelist' %
+                               (opts.app_label, opts.model_name),
+                               current_app=self.admin_site.name)
+            preserved_filters = self.get_preserved_filters(request)
+            post_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, post_url)
+        else:
+            post_url = reverse('admin:index',
+                               current_app=self.admin_site.name)
+        return HttpResponseRedirect(post_url)
+
+    def response_post_save_change(self, request, obj):
+        """
+        Figure out where to redirect after the 'Save' button has been pressed
+        when editing an existing object.
+        """
+        opts = self.model._meta
+
+        if self.has_change_permission(request, None):
+            post_url = reverse('admin:%s_%s_changelist' %
+                               (opts.app_label, opts.model_name),
+                               current_app=self.admin_site.name)
+            preserved_filters = self.get_preserved_filters(request)
+            post_url = add_preserved_filters({'preserved_filters': preserved_filters, 'opts': opts}, post_url)
+        else:
+            post_url = reverse('admin:index',
+                               current_app=self.admin_site.name)
+        return HttpResponseRedirect(post_url)
+
+    def response_action(self, request, queryset):
+        """
+        Handle an admin action. This is called if a request is POSTed to the
+        changelist; it returns an HttpResponse if the action was handled, and
+        None otherwise.
+        """
+
+        # There can be multiple action forms on the page (at the top
+        # and bottom of the change list, for example). Get the action
+        # whose button was pushed.
+        try:
+            action_index = int(request.POST.get('index', 0))
+        except ValueError:
+            action_index = 0
+
+        # Construct the action form.
+        data = request.POST.copy()
+        data.pop(helpers.ACTION_CHECKBOX_NAME, None)
+        data.pop("index", None)
+
+        # Use the action whose button was pushed
+        try:
+            data.update({'action': data.getlist('action')[action_index]})
+        except IndexError:
+            # If we didn't get an action from the chosen form that's invalid
+            # POST data, so by deleting action it'll fail the validation check
+            # below. So no need to do anything here
+            pass
+
+        action_form = self.action_form(data, auto_id=None)
+        action_form.fields['action'].choices = self.get_action_choices(request)
+
+        # If the form's valid we can handle the action.
+        if action_form.is_valid():
+            action = action_form.cleaned_data['action']
+            select_across = action_form.cleaned_data['select_across']
+            func = self.get_actions(request)[action][0]
+
+            # Get the list of selected PKs. If nothing's selected, we can't
+            # perform an action on it, so bail. Except we want to perform
+            # the action explicitly on all objects.
+            selected = request.POST.getlist(helpers.ACTION_CHECKBOX_NAME)
+            if not selected and not select_across:
+                # Reminder that something needs to be selected or nothing will happen
+                msg = _("Items must be selected in order to perform "
+                        "actions on them. No items have been changed.")
+                self.message_user(request, msg, messages.WARNING)
+                return None
+
+            if not select_across:
+                # Perform the action only on the selected objects
+                queryset = queryset.filter(pk__in=selected)
+
+            response = func(self, request, queryset)
+
+            # Actions may return an HttpResponse-like object, which will be
+            # used as the response from the POST. If not, we'll be a good
+            # little HTTP citizen and redirect back to the changelist page.
+            if isinstance(response, HttpResponseBase):
+                return response
+            else:
+                return HttpResponseRedirect(request.get_full_path())
+        else:
+            msg = _("No action selected.")
+            self.message_user(request, msg, messages.WARNING)
+            return None
+
+    @csrf_protect_m
+    @transaction.atomic
+    def add_view(self, request, form_url='', extra_context=None):
+        "The 'add' admin view for this model."
+        model = self.model
+        opts = model._meta
+
+        if not self.has_add_permission(request):
+            raise PermissionDenied
+
+        ModelForm = self.get_form(request)
+        formsets = []
+        inline_instances = self.get_inline_instances(request, None)
+        if request.method == 'POST':
+            form = ModelForm(request.POST, request.FILES)
+            if form.is_valid():
+                new_object = self.save_form(request, form, change=False)
+                form_validated = True
+            else:
+                form_validated = False
+                new_object = self.model()
+            prefixes = {}
+            for FormSet, inline in zip(self.get_formsets(request), inline_instances):
+                prefix = FormSet.get_default_prefix()
+                prefixes[prefix] = prefixes.get(prefix, 0) + 1
+                if prefixes[prefix] != 1 or not prefix:
+                    prefix = "%s-%s" % (prefix, prefixes[prefix])
+                formset = FormSet(data=request.POST, files=request.FILES,
+                                  instance=new_object,
+                                  save_as_new="_saveasnew" in request.POST,
+                                  prefix=prefix, queryset=inline.get_queryset(request))
+                formsets.append(formset)
+            if all_valid(formsets) and form_validated:
+                self.save_model(request, new_object, form, False)
+                self.save_related(request, form, formsets, False)
+                self.log_addition(request, new_object)
+                return self.response_add(request, new_object)
+        else:
+            # Prepare the dict of initial data from the request.
+            # We have to special-case M2Ms as a list of comma-separated PKs.
+            initial = dict(request.GET.items())
+            for k in initial:
+                try:
+                    f = opts.get_field(k)
+                except models.FieldDoesNotExist:
+                    continue
+                if isinstance(f, models.ManyToManyField):
+                    initial[k] = initial[k].split(",")
+            form = ModelForm(initial=initial)
+            prefixes = {}
+            for FormSet, inline in zip(self.get_formsets(request), inline_instances):
+                prefix = FormSet.get_default_prefix()
+                prefixes[prefix] = prefixes.get(prefix, 0) + 1
+                if prefixes[prefix] != 1 or not prefix:
+                    prefix = "%s-%s" % (prefix, prefixes[prefix])
+                formset = FormSet(instance=self.model(), prefix=prefix,
+                                  queryset=inline.get_queryset(request))
+                formsets.append(formset)
+
+        adminForm = helpers.AdminForm(form, list(self.get_fieldsets(request)),
+            self.get_prepopulated_fields(request),
+            self.get_readonly_fields(request),
+            model_admin=self)
+        media = self.media + adminForm.media
+
+        inline_admin_formsets = []
+        for inline, formset in zip(inline_instances, formsets):
+            fieldsets = list(inline.get_fieldsets(request))
+            readonly = list(inline.get_readonly_fields(request))
+            prepopulated = dict(inline.get_prepopulated_fields(request))
+            inline_admin_formset = helpers.InlineAdminFormSet(inline, formset,
+                fieldsets, prepopulated, readonly, model_admin=self)
+            inline_admin_formsets.append(inline_admin_formset)
+            media = media + inline_admin_formset.media
+
+        context = {
+            'title': _('Add %s') % force_text(opts.verbose_name),
+            'adminform': adminForm,
+            'is_popup': IS_POPUP_VAR in request.REQUEST,
+            'media': media,
+            'inline_admin_formsets': inline_admin_formsets,
+            'errors': helpers.AdminErrorList(form, formsets),
+            'app_label': opts.app_label,
+            'preserved_filters': self.get_preserved_filters(request),
+        }
+        context.update(extra_context or {})
+        return self.render_change_form(request, context, form_url=form_url, add=True)
+
+    @csrf_protect_m
+    @transaction.atomic
+    def change_view(self, request, object_id, form_url='', extra_context=None):
+        "The 'change' admin view for this model."
+        model = self.model
+        opts = model._meta
+
+        obj = self.get_object(request, unquote(object_id))
+
+        if not self.has_change_permission(request, obj):
+            raise PermissionDenied
+
+        if obj is None:
+            raise Http404(_('%(name)s object with primary key %(key)r does not exist.') % {'name': force_text(opts.verbose_name), 'key': escape(object_id)})
+
+        if request.method == 'POST' and "_saveasnew" in request.POST:
+            return self.add_view(request, form_url=reverse('admin:%s_%s_add' %
+                                    (opts.app_label, opts.model_name),
+                                    current_app=self.admin_site.name))
+
+        ModelForm = self.get_form(request, obj)
+        formsets = []
+        inline_instances = self.get_inline_instances(request, obj)
+        if request.method == 'POST':
+            form = ModelForm(request.POST, request.FILES, instance=obj)
+            if form.is_valid():
+                form_validated = True
+                new_object = self.save_form(request, form, change=True)
+            else:
+                form_validated = False
+                new_object = obj
+            prefixes = {}
+            for FormSet, inline in zip(self.get_formsets(request, new_object), inline_instances):
+                prefix = FormSet.get_default_prefix()
+                prefixes[prefix] = prefixes.get(prefix, 0) + 1
+                if prefixes[prefix] != 1 or not prefix:
+                    prefix = "%s-%s" % (prefix, prefixes[prefix])
+                formset = FormSet(request.POST, request.FILES,
+                                  instance=new_object, prefix=prefix,
+                                  queryset=inline.get_queryset(request))
+
+                formsets.append(formset)
+
+            if all_valid(formsets) and form_validated:
+                self.save_model(request, new_object, form, True)
+                self.save_related(request, form, formsets, True)
+                change_message = self.construct_change_message(request, form, formsets)
+                self.log_change(request, new_object, change_message)
+                return self.response_change(request, new_object)
+
+        else:
+            form = ModelForm(instance=obj)
+            prefixes = {}
+            for FormSet, inline in zip(self.get_formsets(request, obj), inline_instances):
+                prefix = FormSet.get_default_prefix()
+                prefixes[prefix] = prefixes.get(prefix, 0) + 1
+                if prefixes[prefix] != 1 or not prefix:
+                    prefix = "%s-%s" % (prefix, prefixes[prefix])
+                formset = FormSet(instance=obj, prefix=prefix,
+                                  queryset=inline.get_queryset(request))
+                formsets.append(formset)
+
+        adminForm = helpers.AdminForm(form, self.get_fieldsets(request, obj),
+            self.get_prepopulated_fields(request, obj),
+            self.get_readonly_fields(request, obj),
+            model_admin=self)
+        media = self.media + adminForm.media
+
+        inline_admin_formsets = []
+        for inline, formset in zip(inline_instances, formsets):
+            fieldsets = list(inline.get_fieldsets(request, obj))
+            readonly = list(inline.get_readonly_fields(request, obj))
+            prepopulated = dict(inline.get_prepopulated_fields(request, obj))
+            inline_admin_formset = helpers.InlineAdminFormSet(inline, formset,
+                fieldsets, prepopulated, readonly, model_admin=self)
+            inline_admin_formsets.append(inline_admin_formset)
+            media = media + inline_admin_formset.media
+
+        context = {
+            'title': _('Change %s') % force_text(opts.verbose_name),
+            'adminform': adminForm,
+            'object_id': object_id,
+            'original': obj,
+            'is_popup': IS_POPUP_VAR in request.REQUEST,
+            'media': media,
+            'inline_admin_formsets': inline_admin_formsets,
+            'errors': helpers.AdminErrorList(form, formsets),
+            'app_label': opts.app_label,
+            'preserved_filters': self.get_preserved_filters(request),
+        }
+        context.update(extra_context or {})
+        return self.render_change_form(request, context, change=True, obj=obj, form_url=form_url)
+
+    @csrf_protect_m
+    def changelist_view(self, request, extra_context=None):
+        """
+        The 'change list' admin view for this model.
+        """
+        from django.contrib.admin.views.main import ERROR_FLAG
+        opts = self.model._meta
+        app_label = opts.app_label
+        if not self.has_change_permission(request, None):
+            raise PermissionDenied
+
+        list_display = self.get_list_display(request)
+        list_display_links = self.get_list_display_links(request, list_display)
+        list_filter = self.get_list_filter(request)
+
+        # Check actions to see if any are available on this changelist
+        actions = self.get_actions(request)
+        if actions:
+            # Add the action checkboxes if there are any actions available.
+            list_display = ['action_checkbox'] + list(list_display)
+
+        ChangeList = self.get_changelist(request)
+        try:
+            cl = ChangeList(request, self.model, list_display,
+                list_display_links, list_filter, self.date_hierarchy,
+                self.search_fields, self.list_select_related,
+                self.list_per_page, self.list_max_show_all, self.list_editable,
+                self)
+        except IncorrectLookupParameters:
+            # Wacky lookup parameters were given, so redirect to the main
+            # changelist page, without parameters, and pass an 'invalid=1'
+            # parameter via the query string. If wacky parameters were given
+            # and the 'invalid=1' parameter was already in the query string,
+            # something is screwed up with the database, so display an error
+            # page.
+            if ERROR_FLAG in request.GET.keys():
+                return SimpleTemplateResponse('admin/invalid_setup.html', {
+                    'title': _('Database error'),
+                })
+            return HttpResponseRedirect(request.path + '?' + ERROR_FLAG + '=1')
+
+        # If the request was POSTed, this might be a bulk action or a bulk
+        # edit. Try to look up an action or confirmation first, but if this
+        # isn't an action the POST will fall through to the bulk edit check,
+        # below.
+        action_failed = False
+        selected = request.POST.getlist(helpers.ACTION_CHECKBOX_NAME)
+
+        # Actions with no confirmation
+        if (actions and request.method == 'POST' and
+                'index' in request.POST and '_save' not in request.POST):
+            if selected:
+                response = self.response_action(request, queryset=cl.get_queryset(request))
+                if response:
+                    return response
+                else:
+                    action_failed = True
+            else:
+                msg = _("Items must be selected in order to perform "
+                        "actions on them. No items have been changed.")
+                self.message_user(request, msg, messages.WARNING)
+                action_failed = True
+
+        # Actions with confirmation
+        if (actions and request.method == 'POST' and
+                helpers.ACTION_CHECKBOX_NAME in request.POST and
+                'index' not in request.POST and '_save' not in request.POST):
+            if selected:
+                response = self.response_action(request, queryset=cl.get_queryset(request))
+                if response:
+                    return response
+                else:
+                    action_failed = True
+
+        # If we're allowing changelist editing, we need to construct a formset
+        # for the changelist given all the fields to be edited. Then we'll
+        # use the formset to validate/process POSTed data.
+        formset = cl.formset = None
+
+        # Handle POSTed bulk-edit data.
+        if (request.method == "POST" and cl.list_editable and
+                '_save' in request.POST and not action_failed):
+            FormSet = self.get_changelist_formset(request)
+            formset = cl.formset = FormSet(request.POST, request.FILES, queryset=cl.result_list)
+            if formset.is_valid():
+                changecount = 0
+                for form in formset.forms:
+                    if form.has_changed():
+                        obj = self.save_form(request, form, change=True)
+                        self.save_model(request, obj, form, change=True)
+                        self.save_related(request, form, formsets=[], change=True)
+                        change_msg = self.construct_change_message(request, form, None)
+                        self.log_change(request, obj, change_msg)
+                        changecount += 1
+
+                if changecount:
+                    if changecount == 1:
+                        name = force_text(opts.verbose_name)
+                    else:
+                        name = force_text(opts.verbose_name_plural)
+                    msg = ungettext("%(count)s %(name)s was changed successfully.",
+                                    "%(count)s %(name)s were changed successfully.",
+                                    changecount) % {'count': changecount,
+                                                    'name': name,
+                                                    'obj': force_text(obj)}
+                    self.message_user(request, msg, messages.SUCCESS)
+
+                return HttpResponseRedirect(request.get_full_path())
+
+        # Handle GET -- construct a formset for display.
+        elif cl.list_editable:
+            FormSet = self.get_changelist_formset(request)
+            formset = cl.formset = FormSet(queryset=cl.result_list)
+
+        # Build the list of media to be used by the formset.
+        if formset:
+            media = self.media + formset.media
+        else:
+            media = self.media
+
+        # Build the action form and populate it with available actions.
+        if actions:
+            action_form = self.action_form(auto_id=None)
+            action_form.fields['action'].choices = self.get_action_choices(request)
+        else:
+            action_form = None
+
+        selection_note_all = ungettext('%(total_count)s selected',
+            'All %(total_count)s selected', cl.result_count)
+
+        context = {
+            'module_name': force_text(opts.verbose_name_plural),
+            'selection_note': _('0 of %(cnt)s selected') % {'cnt': len(cl.result_list)},
+            'selection_note_all': selection_note_all % {'total_count': cl.result_count},
+            'title': cl.title,
+            'is_popup': cl.is_popup,
+            'cl': cl,
+            'media': media,
+            'has_add_permission': self.has_add_permission(request),
+            'opts': cl.opts,
+            'app_label': app_label,
+            'action_form': action_form,
+            'actions_on_top': self.actions_on_top,
+            'actions_on_bottom': self.actions_on_bottom,
+            'actions_selection_counter': self.actions_selection_counter,
+            'preserved_filters': self.get_preserved_filters(request),
+        }
+        context.update(extra_context or {})
+
+        return TemplateResponse(request, self.change_list_template or [
+            'admin/%s/%s/change_list.html' % (app_label, opts.model_name),
+            'admin/%s/change_list.html' % app_label,
+            'admin/change_list.html'
+        ], context, current_app=self.admin_site.name)
+
+    @csrf_protect_m
+    @transaction.atomic
+    def delete_view(self, request, object_id, extra_context=None):
+        "The 'delete' admin view for this model."
+        opts = self.model._meta
+        app_label = opts.app_label
+
+        obj = self.get_object(request, unquote(object_id))
+
+        if not self.has_delete_permission(request, obj):
+            raise PermissionDenied
+
+        if obj is None:
+            raise Http404(
+                _('%(name)s object with primary key %(key)r does not exist.') %
+                    {'name': force_text(opts.verbose_name), 'key': escape(object_id)}
+            )
+
+        using = router.db_for_write(self.model)
+
+        # Populate deleted_objects, a data structure of all related objects that
+        # will also be deleted.
+        (deleted_objects, perms_needed, protected) = get_deleted_objects(
+            [obj], opts, request.user, self.admin_site, using)
+
+        if request.POST:  # The user has already confirmed the deletion.
+            if perms_needed:
+                raise PermissionDenied
+            obj_display = force_text(obj)
+            self.log_deletion(request, obj, obj_display)
+            self.delete_model(request, obj)
+
+            self.message_user(request, _(
+                'The %(name)s "%(obj)s" was deleted successfully.') % {
+                                       'name': force_text(opts.verbose_name),
+                                       'obj': force_text(obj_display)},
+                              messages.SUCCESS)
+
+            if self.has_change_permission(request, None):
+                post_url = reverse('admin:%s_%s_changelist' %
+                                   (opts.app_label, opts.model_name),
+                                   current_app=self.admin_site.name)
+                preserved_filters = self.get_preserved_filters(request)
+                post_url = add_preserved_filters(
+                    {'preserved_filters': preserved_filters, 'opts': opts}, post_url
+                )
+            else:
+                post_url = reverse('admin:index',
+                                   current_app=self.admin_site.name)
+            return HttpResponseRedirect(post_url)
+
+        object_name = force_text(opts.verbose_name)
+
+        if perms_needed or protected:
+            title = _("Cannot delete %(name)s") % {"name": object_name}
+        else:
+            title = _("Are you sure?")
+
+        context = {
+            "title": title,
+            "object_name": object_name,
+            "object": obj,
+            "deleted_objects": deleted_objects,
+            "perms_lacking": perms_needed,
+            "protected": protected,
+            "opts": opts,
+            "app_label": app_label,
+            'preserved_filters': self.get_preserved_filters(request),
+        }
+        context.update(extra_context or {})
+
+        return TemplateResponse(request, self.delete_confirmation_template or [
+            "admin/%s/%s/delete_confirmation.html" % (app_label, opts.model_name),
+            "admin/%s/delete_confirmation.html" % app_label,
+            "admin/delete_confirmation.html"
+        ], context, current_app=self.admin_site.name)
+
+    def history_view(self, request, object_id, extra_context=None):
+        "The 'history' admin view for this model."
+        from django.contrib.admin.models import LogEntry
+        # First check if the user can see this history.
+        model = self.model
+        obj = get_object_or_404(model, pk=unquote(object_id))
+
+        if not self.has_change_permission(request, obj):
+            raise PermissionDenied
+
+        # Then get the history for this object.
+        opts = model._meta
+        app_label = opts.app_label
+        action_list = LogEntry.objects.filter(
+            object_id=unquote(object_id),
+            content_type__id__exact=ContentType.objects.get_for_model(model).id
+        ).select_related().order_by('action_time')
+
+        context = {
+            'title': _('Change history: %s') % force_text(obj),
+            'action_list': action_list,
+            'module_name': capfirst(force_text(opts.verbose_name_plural)),
+            'object': obj,
+            'app_label': app_label,
+            'opts': opts,
+            'preserved_filters': self.get_preserved_filters(request),
+        }
+        context.update(extra_context or {})
+        return TemplateResponse(request, self.object_history_template or [
+            "admin/%s/%s/object_history.html" % (app_label, opts.model_name),
+            "admin/%s/object_history.html" % app_label,
+            "admin/object_history.html"
+        ], context, current_app=self.admin_site.name)
+
+
+class InlineModelAdmin(BaseModelAdmin):
+    """
+    Options for inline editing of ``model`` instances.
+
+    Provide ``name`` to specify the attribute name of the ``ForeignKey`` from
+    ``model`` to its parent. This is required if ``model`` has more than one
+    ``ForeignKey`` to its parent.
+    """
+    model = None
+    fk_name = None
+    formset = BaseInlineFormSet
+    extra = 3
+    max_num = None
+    template = None
+    verbose_name = None
+    verbose_name_plural = None
+    can_delete = True
+
+    # validation
+    validator_class = validation.InlineValidator
+
+    def __init__(self, parent_model, admin_site):
+        self.admin_site = admin_site
+        self.parent_model = parent_model
+        self.opts = self.model._meta
+        super(InlineModelAdmin, self).__init__()
+        if self.verbose_name is None:
+            self.verbose_name = self.model._meta.verbose_name
+        if self.verbose_name_plural is None:
+            self.verbose_name_plural = self.model._meta.verbose_name_plural
+
+    @property
+    def media(self):
+        extra = '' if settings.DEBUG else '.min'
+        js = ['jquery%s.js' % extra, 'jquery.init.js', 'inlines%s.js' % extra]
+        if self.prepopulated_fields:
+            js.extend(['urlify.js', 'prepopulate%s.js' % extra])
+        if self.filter_vertical or self.filter_horizontal:
+            js.extend(['SelectBox.js', 'SelectFilter2.js'])
+        return forms.Media(js=[static('admin/js/%s' % url) for url in js])
+
+    def get_extra(self, request, obj=None, **kwargs):
+        """Hook for customizing the number of extra inline forms."""
+        return self.extra
+
+    def get_max_num(self, request, obj=None, **kwargs):
+        """Hook for customizing the max number of extra inline forms."""
+        return self.max_num
+
+    def get_formset(self, request, obj=None, **kwargs):
+        """Returns a BaseInlineFormSet class for use in admin add/change views."""
+        if 'fields' in kwargs:
+            fields = kwargs.pop('fields')
+        else:
+            fields = flatten_fieldsets(self.get_fieldsets(request, obj))
+        if self.exclude is None:
+            exclude = []
+        else:
+            exclude = list(self.exclude)
+        exclude.extend(self.get_readonly_fields(request, obj))
+        if self.exclude is None and hasattr(self.form, '_meta') and self.form._meta.exclude:
+            # Take the custom ModelForm's Meta.exclude into account only if the
+            # InlineModelAdmin doesn't define its own.
+            exclude.extend(self.form._meta.exclude)
+        # if exclude is an empty list we use None, since that's the actual
+        # default
+        exclude = exclude or None
+        can_delete = self.can_delete and self.has_delete_permission(request, obj)
+        defaults = {
+            "form": self.form,
+            "formset": self.formset,
+            "fk_name": self.fk_name,
+            "fields": fields,
+            "exclude": exclude,
+            "formfield_callback": partial(self.formfield_for_dbfield, request=request),
+            "extra": self.get_extra(request, obj, **kwargs),
+            "max_num": self.get_max_num(request, obj, **kwargs),
+            "can_delete": can_delete,
+        }
+
+        defaults.update(kwargs)
+        base_model_form = defaults['form']
+
+        class DeleteProtectedModelForm(base_model_form):
+            def hand_clean_DELETE(self):
+                """
+                We don't validate the 'DELETE' field itself because on
+                templates it's not rendered using the field information, but
+                just using a generic "deletion_field" of the InlineModelAdmin.
+                """
+                if self.cleaned_data.get(DELETION_FIELD_NAME, False):
+                    using = router.db_for_write(self._meta.model)
+                    collector = NestedObjects(using=using)
+                    collector.collect([self.instance])
+                    if collector.protected:
+                        objs = []
+                        for p in collector.protected:
+                            objs.append(
+                                # Translators: Model verbose name and instance representation, suitable to be an item in a list
+                                _('%(class_name)s %(instance)s') % {
+                                    'class_name': p._meta.verbose_name,
+                                    'instance': p}
+                            )
+                        params = {'class_name': self._meta.model._meta.verbose_name,
+                                  'instance': self.instance,
+                                  'related_objects': get_text_list(objs, _('and'))}
+                        msg = _("Deleting %(class_name)s %(instance)s would require "
+                                "deleting the following protected related objects: "
+                                "%(related_objects)s")
+                        raise ValidationError(msg, code='deleting_protected', params=params)
+
+            def is_valid(self):
+                result = super(DeleteProtectedModelForm, self).is_valid()
+                self.hand_clean_DELETE()
+                return result
+
+        defaults['form'] = DeleteProtectedModelForm
+
+        if defaults['fields'] is None and not modelform_defines_fields(defaults['form']):
+            defaults['fields'] = forms.ALL_FIELDS
+
+        return inlineformset_factory(self.parent_model, self.model, **defaults)
+
+    def get_fieldsets(self, request, obj=None):
+        if self.declared_fieldsets:
+            return self.declared_fieldsets
+        form = self.get_formset(request, obj, fields=None).form
+        fields = list(form.base_fields) + list(self.get_readonly_fields(request, obj))
+        return [(None, {'fields': fields})]
+
+    def get_queryset(self, request):
+        queryset = super(InlineModelAdmin, self).get_queryset(request)
+        if not self.has_change_permission(request):
+            queryset = queryset.none()
+        return queryset
+
+    def has_add_permission(self, request):
+        if self.opts.auto_created:
+            # We're checking the rights to an auto-created intermediate model,
+            # which doesn't have its own individual permissions. The user needs
+            # to have the change permission for the related model in order to
+            # be able to do anything with the intermediate model.
+            return self.has_change_permission(request)
+        return super(InlineModelAdmin, self).has_add_permission(request)
+
+    def has_change_permission(self, request, obj=None):
+        opts = self.opts
+        if opts.auto_created:
+            # The model was auto-created as intermediary for a
+            # ManyToMany-relationship, find the target model
+            for field in opts.fields:
+                if field.rel and field.rel.to != self.parent_model:
+                    opts = field.rel.to._meta
+                    break
+        codename = get_permission_codename('change', opts)
+        return request.user.has_perm("%s.%s" % (opts.app_label, codename))
+
+    def has_delete_permission(self, request, obj=None):
+        if self.opts.auto_created:
+            # We're checking the rights to an auto-created intermediate model,
+            # which doesn't have its own individual permissions. The user needs
+            # to have the change permission for the related model in order to
+            # be able to do anything with the intermediate model.
+            return self.has_change_permission(request, obj)
+        return super(InlineModelAdmin, self).has_delete_permission(request, obj)
+
+
+class StackedInline(InlineModelAdmin):
+    template = 'admin/edit_inline/stacked.html'
+
+
+class TabularInline(InlineModelAdmin):
+    template = 'admin/edit_inline/tabular.html'