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Fixed #21275 -- Migration serializer look for a deconstruct method on…
… any object.
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,35 @@ | ||
def deconstructible(*args, **kwargs): | ||
""" | ||
Class decorator that allow the decorated class to be serialized | ||
by the migrations subsystem. | ||
Accepts an optional kwarg `path` to specify the import path. | ||
""" | ||
path = kwargs.pop('path', None) | ||
|
||
def decorator(klass): | ||
def __new__(cls, *args, **kwargs): | ||
# We capture the arguments to make returning them trivial | ||
obj = super(klass, cls).__new__(cls) | ||
obj._constructor_args = (args, kwargs) | ||
return obj | ||
|
||
def deconstruct(obj): | ||
""" | ||
Returns a 3-tuple of class import path, positional arguments, | ||
and keyword arguments. | ||
""" | ||
return ( | ||
path or '%s.%s' % (obj.__class__.__module__, obj.__class__.__name__), | ||
obj._constructor_args[0], | ||
obj._constructor_args[1], | ||
) | ||
|
||
klass.__new__ = staticmethod(__new__) | ||
klass.deconstruct = deconstruct | ||
|
||
return klass | ||
|
||
if not args: | ||
return decorator | ||
return decorator(*args, **kwargs) |
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