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