36 lines
1.1 KiB
Python
36 lines
1.1 KiB
Python
def deconstructible(*args, **kwargs):
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"""
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Class decorator that allow the decorated class to be serialized
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by the migrations subsystem.
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Accepts an optional kwarg `path` to specify the import path.
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"""
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path = kwargs.pop('path', None)
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def decorator(klass):
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def __new__(cls, *args, **kwargs):
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# We capture the arguments to make returning them trivial
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obj = super(klass, cls).__new__(cls)
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obj._constructor_args = (args, kwargs)
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return obj
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def deconstruct(obj):
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"""
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Returns a 3-tuple of class import path, positional arguments,
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and keyword arguments.
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"""
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return (
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path or '%s.%s' % (obj.__class__.__module__, obj.__class__.__name__),
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obj._constructor_args[0],
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obj._constructor_args[1],
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)
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klass.__new__ = staticmethod(__new__)
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klass.deconstruct = deconstruct
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return klass
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if not args:
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return decorator
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return decorator(*args, **kwargs)
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