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Optimize transmogrify() function, assign __class__ instead.

fix_request_path_info
Diederik van der Boor 2013-04-07 22:26:31 +02:00
parent a0ab068449
commit bb0a4daddc
1 changed files with 11 additions and 4 deletions
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15
polymorphic/query.py
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@ -19,13 +19,20 @@ Polymorphic_QuerySet_objects_per_request = CHUNK_SIZE
def transmogrify(cls, obj): def transmogrify(cls, obj):
""" """
Clone an object as a different class, by instantiating that class and copying the __dict__ Upcast a class to a different type without asking questions.
""" """
new = cls() if not '__init__' in obj.__dict__:
for k,v in obj.__dict__.items(): # Just assign __class__ to a different value.
new.__dict__[k] = v new = obj
new.__class__ = cls
else:
# Run constructor, reassign values
new = cls()
for k,v in obj.__dict__.items():
new.__dict__[k] = v
return new return new
################################################################################### ###################################################################################
### PolymorphicQuerySet ### PolymorphicQuerySet