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"""
Generally helpful utility functions.
"""
def _ask_for_it_by_name(name):
"Returns an object referenced by absolute path."
bits = str(name).split(".")
## what if there is no absolute reference?
if len(bits) > 1:
modulename = ".".join(bits[:-1])
else:
modulename = bits[0]
module = __import__(modulename, {}, {}, bits[-1])
if len(bits) == 1:
return module
else:
return getattr(module, bits[-1])
def ask_for_it_by_name(name):
"Returns an object referenced by absolute path. (Memoised outer wrapper)"
if name not in ask_for_it_by_name.cache:
ask_for_it_by_name.cache[name] = _ask_for_it_by_name(name)
return ask_for_it_by_name.cache[name]
ask_for_it_by_name.cache = {}
def get_attribute(item, attribute):
"""
Like getattr, but recursive (i.e. you can ask for 'foo.bar.yay'.)
"""
value = item
for part in attribute.split("."):
value = getattr(value, part)
return value
def auto_through(field):
"Returns if the M2M class passed in has an autogenerated through table or not."
return (
# Django 1.0/1.1
(not field.rel.through)
or
# Django 1.2+
getattr(getattr(field.rel.through, "_meta", None), "auto_created", False)
)
def auto_model(model):
"Returns if the given model was automatically generated."
return getattr(model._meta, "auto_created", False)
def memoize(function):
"Standard memoization decorator."
name = function.__name__
_name = '_' + name
def method(self):
if not hasattr(self, _name):
value = function(self)
setattr(self, _name, value)
return getattr(self, _name)
def invalidate():
if hasattr(method, _name):
delattr(method, _name)
method.__name__ = function.__name__
method.__doc__ = function.__doc__
method._invalidate = invalidate
return method
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