diff options
Diffstat (limited to 'lib/python2.7/site-packages/south/creator/changes.py')
| -rw-r--r-- | lib/python2.7/site-packages/south/creator/changes.py | 506 |
1 files changed, 0 insertions, 506 deletions
diff --git a/lib/python2.7/site-packages/south/creator/changes.py b/lib/python2.7/site-packages/south/creator/changes.py deleted file mode 100644 index 6cdbd19..0000000 --- a/lib/python2.7/site-packages/south/creator/changes.py +++ /dev/null @@ -1,506 +0,0 @@ -""" -Contains things to detect changes - either using options passed in on the -commandline, or by using autodetection, etc. -""" - -from __future__ import print_function - -from django.db import models -from django.contrib.contenttypes.generic import GenericRelation -from django.utils.datastructures import SortedDict - -from south.creator.freezer import remove_useless_attributes, freeze_apps, model_key -from south.utils import auto_through -from south.utils.py3 import string_types - -class BaseChanges(object): - """ - Base changes class. - """ - def suggest_name(self): - return '' - - def split_model_def(self, model, model_def): - """ - Given a model and its model def (a dict of field: triple), returns three - items: the real fields dict, the Meta dict, and the M2M fields dict. - """ - real_fields = SortedDict() - meta = SortedDict() - m2m_fields = SortedDict() - for name, triple in model_def.items(): - if name == "Meta": - meta = triple - elif isinstance(model._meta.get_field_by_name(name)[0], models.ManyToManyField): - m2m_fields[name] = triple - else: - real_fields[name] = triple - return real_fields, meta, m2m_fields - - def current_model_from_key(self, key): - app_label, model_name = key.split(".") - return models.get_model(app_label, model_name) - - def current_field_from_key(self, key, fieldname): - app_label, model_name = key.split(".") - # Special, for the magical field from order_with_respect_to - if fieldname == "_order": - field = models.IntegerField() - field.name = "_order" - field.attname = "_order" - field.column = "_order" - field.default = 0 - return field - # Otherwise, normal. - return models.get_model(app_label, model_name)._meta.get_field_by_name(fieldname)[0] - - -class AutoChanges(BaseChanges): - """ - Detects changes by 'diffing' two sets of frozen model definitions. - """ - - # Field types we don't generate add/remove field changes for. - IGNORED_FIELD_TYPES = [ - GenericRelation, - ] - - def __init__(self, migrations, old_defs, old_orm, new_defs): - self.migrations = migrations - self.old_defs = old_defs - self.old_orm = old_orm - self.new_defs = new_defs - - def suggest_name(self): - parts = ["auto"] - for change_name, params in self.get_changes(): - if change_name == "AddModel": - parts.append("add_%s" % params['model']._meta.object_name.lower()) - elif change_name == "DeleteModel": - parts.append("del_%s" % params['model']._meta.object_name.lower()) - elif change_name == "AddField": - parts.append("add_field_%s_%s" % ( - params['model']._meta.object_name.lower(), - params['field'].name, - )) - elif change_name == "DeleteField": - parts.append("del_field_%s_%s" % ( - params['model']._meta.object_name.lower(), - params['field'].name, - )) - elif change_name == "ChangeField": - parts.append("chg_field_%s_%s" % ( - params['model']._meta.object_name.lower(), - params['new_field'].name, - )) - elif change_name == "AddUnique": - parts.append("add_unique_%s_%s" % ( - params['model']._meta.object_name.lower(), - "_".join([x.name for x in params['fields']]), - )) - elif change_name == "DeleteUnique": - parts.append("del_unique_%s_%s" % ( - params['model']._meta.object_name.lower(), - "_".join([x.name for x in params['fields']]), - )) - elif change_name == "AddIndex": - parts.append("add_index_%s_%s" % ( - params['model']._meta.object_name.lower(), - "_".join([x.name for x in params['fields']]), - )) - elif change_name == "DeleteIndex": - parts.append("del_index_%s_%s" % ( - params['model']._meta.object_name.lower(), - "_".join([x.name for x in params['fields']]), - )) - return ("__".join(parts))[:70] - - def get_changes(self): - """ - Returns the difference between the old and new sets of models as a 5-tuple: - added_models, deleted_models, added_fields, deleted_fields, changed_fields - """ - - deleted_models = set() - - # See if anything's vanished - for key in self.old_defs: - if key not in self.new_defs: - # We shouldn't delete it if it was managed=False - old_fields, old_meta, old_m2ms = self.split_model_def(self.old_orm[key], self.old_defs[key]) - if old_meta.get("managed", "True") != "False": - # Alright, delete it. - yield ("DeleteModel", { - "model": self.old_orm[key], - "model_def": old_fields, - }) - # Also make sure we delete any M2Ms it had. - for fieldname in old_m2ms: - # Only delete its stuff if it wasn't a through=. - field = self.old_orm[key + ":" + fieldname] - if auto_through(field): - yield ("DeleteM2M", {"model": self.old_orm[key], "field": field}) - # And any index/uniqueness constraints it had - for attr, operation in (("unique_together", "DeleteUnique"), ("index_together", "DeleteIndex")): - together = eval(old_meta.get(attr, "[]")) - if together: - # If it's only a single tuple, make it into the longer one - if isinstance(together[0], string_types): - together = [together] - # For each combination, make an action for it - for fields in together: - yield (operation, { - "model": self.old_orm[key], - "fields": [self.old_orm[key]._meta.get_field_by_name(x)[0] for x in fields], - }) - # We always add it in here so we ignore it later - deleted_models.add(key) - - # Or appeared - for key in self.new_defs: - if key not in self.old_defs: - # We shouldn't add it if it's managed=False - new_fields, new_meta, new_m2ms = self.split_model_def(self.current_model_from_key(key), self.new_defs[key]) - if new_meta.get("managed", "True") != "False": - yield ("AddModel", { - "model": self.current_model_from_key(key), - "model_def": new_fields, - }) - # Also make sure we add any M2Ms it has. - for fieldname in new_m2ms: - # Only create its stuff if it wasn't a through=. - field = self.current_field_from_key(key, fieldname) - if auto_through(field): - yield ("AddM2M", {"model": self.current_model_from_key(key), "field": field}) - # And any index/uniqueness constraints it has - for attr, operation in (("unique_together", "AddUnique"), ("index_together", "AddIndex")): - together = eval(new_meta.get(attr, "[]")) - if together: - # If it's only a single tuple, make it into the longer one - if isinstance(together[0], string_types): - together = [together] - # For each combination, make an action for it - for fields in together: - yield (operation, { - "model": self.current_model_from_key(key), - "fields": [self.current_model_from_key(key)._meta.get_field_by_name(x)[0] for x in fields], - }) - - # Now, for every model that's stayed the same, check its fields. - for key in self.old_defs: - if key not in deleted_models: - - old_fields, old_meta, old_m2ms = self.split_model_def(self.old_orm[key], self.old_defs[key]) - new_fields, new_meta, new_m2ms = self.split_model_def(self.current_model_from_key(key), self.new_defs[key]) - - # Do nothing for models which are now not managed. - if new_meta.get("managed", "True") == "False": - continue - - # Find fields that have vanished. - for fieldname in old_fields: - if fieldname not in new_fields: - # Don't do it for any fields we're ignoring - field = self.old_orm[key + ":" + fieldname] - field_allowed = True - for field_type in self.IGNORED_FIELD_TYPES: - if isinstance(field, field_type): - field_allowed = False - if field_allowed: - # Looks alright. - yield ("DeleteField", { - "model": self.old_orm[key], - "field": field, - "field_def": old_fields[fieldname], - }) - - # And ones that have appeared - for fieldname in new_fields: - if fieldname not in old_fields: - # Don't do it for any fields we're ignoring - field = self.current_field_from_key(key, fieldname) - field_allowed = True - for field_type in self.IGNORED_FIELD_TYPES: - if isinstance(field, field_type): - field_allowed = False - if field_allowed: - # Looks alright. - yield ("AddField", { - "model": self.current_model_from_key(key), - "field": field, - "field_def": new_fields[fieldname], - }) - - # Find M2Ms that have vanished - for fieldname in old_m2ms: - if fieldname not in new_m2ms: - # Only delete its stuff if it wasn't a through=. - field = self.old_orm[key + ":" + fieldname] - if auto_through(field): - yield ("DeleteM2M", {"model": self.old_orm[key], "field": field}) - - # Find M2Ms that have appeared - for fieldname in new_m2ms: - if fieldname not in old_m2ms: - # Only create its stuff if it wasn't a through=. - field = self.current_field_from_key(key, fieldname) - if auto_through(field): - yield ("AddM2M", {"model": self.current_model_from_key(key), "field": field}) - - # For the ones that exist in both models, see if they were changed - for fieldname in set(old_fields).intersection(set(new_fields)): - # Non-index changes - if self.different_attributes( - remove_useless_attributes(old_fields[fieldname], True, True), - remove_useless_attributes(new_fields[fieldname], True, True)): - yield ("ChangeField", { - "model": self.current_model_from_key(key), - "old_field": self.old_orm[key + ":" + fieldname], - "new_field": self.current_field_from_key(key, fieldname), - "old_def": old_fields[fieldname], - "new_def": new_fields[fieldname], - }) - # Index changes - old_field = self.old_orm[key + ":" + fieldname] - new_field = self.current_field_from_key(key, fieldname) - if not old_field.db_index and new_field.db_index: - # They've added an index. - yield ("AddIndex", { - "model": self.current_model_from_key(key), - "fields": [new_field], - }) - if old_field.db_index and not new_field.db_index: - # They've removed an index. - yield ("DeleteIndex", { - "model": self.old_orm[key], - "fields": [old_field], - }) - # See if their uniques have changed - if old_field.unique != new_field.unique: - # Make sure we look at the one explicitly given to see what happened - if new_field.unique: - yield ("AddUnique", { - "model": self.current_model_from_key(key), - "fields": [new_field], - }) - else: - yield ("DeleteUnique", { - "model": self.old_orm[key], - "fields": [old_field], - }) - - # See if there's any M2Ms that have changed. - for fieldname in set(old_m2ms).intersection(set(new_m2ms)): - old_field = self.old_orm[key + ":" + fieldname] - new_field = self.current_field_from_key(key, fieldname) - # Have they _added_ a through= ? - if auto_through(old_field) and not auto_through(new_field): - yield ("DeleteM2M", {"model": self.old_orm[key], "field": old_field}) - # Have they _removed_ a through= ? - if not auto_through(old_field) and auto_through(new_field): - yield ("AddM2M", {"model": self.current_model_from_key(key), "field": new_field}) - - ## See if the {index,unique}_togethers have changed - for attr, add_operation, del_operation in (("unique_together", "AddUnique", "DeleteUnique"), ("index_together", "AddIndex", "DeleteIndex")): - # First, normalise them into lists of sets. - old_together = eval(old_meta.get(attr, "[]")) - new_together = eval(new_meta.get(attr, "[]")) - if old_together and isinstance(old_together[0], string_types): - old_together = [old_together] - if new_together and isinstance(new_together[0], string_types): - new_together = [new_together] - old_together = frozenset(tuple(o) for o in old_together) - new_together = frozenset(tuple(n) for n in new_together) - # See if any appeared or disappeared - disappeared = old_together.difference(new_together) - appeared = new_together.difference(old_together) - for item in disappeared: - yield (del_operation, { - "model": self.old_orm[key], - "fields": [self.old_orm[key + ":" + x] for x in item], - }) - for item in appeared: - yield (add_operation, { - "model": self.current_model_from_key(key), - "fields": [self.current_field_from_key(key, x) for x in item], - }) - - @classmethod - def is_triple(cls, triple): - "Returns whether the argument is a triple." - return isinstance(triple, (list, tuple)) and len(triple) == 3 and \ - isinstance(triple[0], string_types) and \ - isinstance(triple[1], (list, tuple)) and \ - isinstance(triple[2], dict) - - @classmethod - def different_attributes(cls, old, new): - """ - Backwards-compat comparison that ignores orm. on the RHS and not the left - and which knows django.db.models.fields.CharField = models.CharField. - Has a whole load of tests in tests/autodetection.py. - """ - - # If they're not triples, just do normal comparison - if not cls.is_triple(old) or not cls.is_triple(new): - return old != new - - # Expand them out into parts - old_field, old_pos, old_kwd = old - new_field, new_pos, new_kwd = new - - # Copy the positional and keyword arguments so we can compare them and pop off things - old_pos, new_pos = old_pos[:], new_pos[:] - old_kwd = dict(old_kwd.items()) - new_kwd = dict(new_kwd.items()) - - # Remove comparison of the existence of 'unique', that's done elsewhere. - # TODO: Make this work for custom fields where unique= means something else? - if "unique" in old_kwd: - del old_kwd['unique'] - if "unique" in new_kwd: - del new_kwd['unique'] - - # If the first bit is different, check it's not by dj.db.models... - if old_field != new_field: - if old_field.startswith("models.") and (new_field.startswith("django.db.models") \ - or new_field.startswith("django.contrib.gis")): - if old_field.split(".")[-1] != new_field.split(".")[-1]: - return True - else: - # Remove those fields from the final comparison - old_field = new_field = "" - - # If there's a positional argument in the first, and a 'to' in the second, - # see if they're actually comparable. - if (old_pos and "to" in new_kwd) and ("orm" in new_kwd['to'] and "orm" not in old_pos[0]): - # Do special comparison to fix #153 - try: - if old_pos[0] != new_kwd['to'].split("'")[1].split(".")[1]: - return True - except IndexError: - pass # Fall back to next comparison - # Remove those attrs from the final comparison - old_pos = old_pos[1:] - del new_kwd['to'] - - return old_field != new_field or old_pos != new_pos or old_kwd != new_kwd - - -class ManualChanges(BaseChanges): - """ - Detects changes by reading the command line. - """ - - def __init__(self, migrations, added_models, added_fields, added_indexes): - self.migrations = migrations - self.added_models = added_models - self.added_fields = added_fields - self.added_indexes = added_indexes - - def suggest_name(self): - bits = [] - for model_name in self.added_models: - bits.append('add_model_%s' % model_name) - for field_name in self.added_fields: - bits.append('add_field_%s' % field_name) - for index_name in self.added_indexes: - bits.append('add_index_%s' % index_name) - return '_'.join(bits).replace('.', '_') - - def get_changes(self): - # Get the model defs so we can use them for the yield later - model_defs = freeze_apps([self.migrations.app_label()]) - # Make the model changes - for model_name in self.added_models: - model = models.get_model(self.migrations.app_label(), model_name) - real_fields, meta, m2m_fields = self.split_model_def(model, model_defs[model_key(model)]) - yield ("AddModel", { - "model": model, - "model_def": real_fields, - }) - # And the field changes - for field_desc in self.added_fields: - try: - model_name, field_name = field_desc.split(".") - except (TypeError, ValueError): - raise ValueError("%r is not a valid field description." % field_desc) - model = models.get_model(self.migrations.app_label(), model_name) - real_fields, meta, m2m_fields = self.split_model_def(model, model_defs[model_key(model)]) - yield ("AddField", { - "model": model, - "field": model._meta.get_field_by_name(field_name)[0], - "field_def": real_fields[field_name], - }) - # And the indexes - for field_desc in self.added_indexes: - try: - model_name, field_name = field_desc.split(".") - except (TypeError, ValueError): - print("%r is not a valid field description." % field_desc) - model = models.get_model(self.migrations.app_label(), model_name) - yield ("AddIndex", { - "model": model, - "fields": [model._meta.get_field_by_name(field_name)[0]], - }) - - -class InitialChanges(BaseChanges): - """ - Creates all models; handles --initial. - """ - def suggest_name(self): - return 'initial' - - def __init__(self, migrations): - self.migrations = migrations - - def get_changes(self): - # Get the frozen models for this app - model_defs = freeze_apps([self.migrations.app_label()]) - - for model in models.get_models(models.get_app(self.migrations.app_label())): - - # Don't do anything for unmanaged, abstract or proxy models - if model._meta.abstract or getattr(model._meta, "proxy", False) or not getattr(model._meta, "managed", True): - continue - - real_fields, meta, m2m_fields = self.split_model_def(model, model_defs[model_key(model)]) - - # Firstly, add the main table and fields - yield ("AddModel", { - "model": model, - "model_def": real_fields, - }) - - # Then, add any indexing/uniqueness that's around - if meta: - for attr, operation in (("unique_together", "AddUnique"), ("index_together", "AddIndex")): - together = eval(meta.get(attr, "[]")) - if together: - # If it's only a single tuple, make it into the longer one - if isinstance(together[0], string_types): - together = [together] - # For each combination, make an action for it - for fields in together: - yield (operation, { - "model": model, - "fields": [model._meta.get_field_by_name(x)[0] for x in fields], - }) - - # Finally, see if there's some M2M action - for name, triple in m2m_fields.items(): - field = model._meta.get_field_by_name(name)[0] - # But only if it's not through=foo (#120) - if field.rel.through: - try: - # Django 1.1 and below - through_model = field.rel.through_model - except AttributeError: - # Django 1.2 - through_model = field.rel.through - if (not field.rel.through) or getattr(through_model._meta, "auto_created", False): - yield ("AddM2M", { - "model": model, - "field": field, - }) |