#10112: Python Crash with ORM Inheritance
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Reporter: [email protected] | Owner: nobody
Status: new | Milestone: post-1.0
Component: Database layer (models, ORM) | Version: 1.0
Resolution: | Keywords:
Stage: Unreviewed | Has_patch: 0
Needs_docs: 0 | Needs_tests: 0
Needs_better_patch: 0 |
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Changes (by Alex):
* needs_better_patch: => 0
* needs_tests: => 0
* needs_docs: => 0
Old description:
> This bug causes a reproducible crash in the python interpreter [python
> issue5014] on my system, so I can't give a specific traceback, but I
> believe that an infinite recursion is generated when I try and use the
> db_column in a TextField.
>
> Basically, I'm modifying one of my models to allow inheritance of a field
> so rather than keep the existing field which cannot be overridden with a
> function in the subclass, I'm creating a property to access the field -
> ie:
>
> class Foo(model):
> _bar = TextField(db_column = 'bar')
>
> bar = property(lambda x: x.bar)
>
> class Bla(Foo):
> @property
> def bar(self): whatever
>
> I think the db_column = 'bar' causes problems as there is a Foo.bar
> attribute so somewhere in the model this is screwing things up by making
> an infinite loop which for some reason is breaking the python runtime.
>
> Reproducible with revision 9787
New description:
This bug causes a reproducible crash in the python interpreter [python
issue5014] on my system, so I can't give a specific traceback, but I
believe that an infinite recursion is generated when I try and use the
db_column in a TextField.
Basically, I'm modifying one of my models to allow inheritance of a field
so rather than keep the existing field which cannot be overridden with a
function in the subclass, I'm creating a property to access the field -
ie:
{{{
class Foo(model):
_bar = TextField(db_column = 'bar')
bar = property(lambda x: x.bar)
class Bla(Foo):
@property
def bar(self): whatever
}}}
I think the db_column = 'bar' causes problems as there is a Foo.bar
attribute so somewhere in the model this is screwing things up by making
an infinite loop which for some reason is breaking the python runtime.
Reproducible with revision 9787
Comment:
edited for readability, please use the preview feature :)
--
Ticket URL: <http://code.djangoproject.com/ticket/10112#comment:1>
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