31 lines
1.9 KiB
Diff
31 lines
1.9 KiB
Diff
Based on my knowledge of Django's codebase and the issue description, I can provide the patch. The bug is in `django/db/models/fields/__init__.py` in the `contribute_to_class` method.
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The issue is that when a child model overrides a field with different choices, the `hasattr` check prevents the `get_FOO_display` method from being updated because the parent class already defined it. The solution is to check if the method exists in the class's own `__dict__` rather than using `hasattr`, which also looks at parent classes.
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Here's the patch:
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--- a/django/db/models/fields/__init__.py
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+++ b/django/db/models/fields/__init__.py
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@@ -763,7 +763,7 @@ class Field(RegisterLookupMixin):
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setattr(cls, self.attname, self.descriptor_class(self))
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if self.choices is not None:
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setattr(cls, 'get_%s_display' % self.name,
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- partialmethod(cls._get_FIELD_display, field=self))
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+ partialmethod(cls._get_FIELD_display, field=self))
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def get_filter_kwargs_for_object(self, obj):
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"""
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Wait, that's not quite right. Let me reconsider the issue more carefully.
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The problem is on line 766 where there's a check `if not hasattr(cls, 'get_%s_display' % self.name)` that was added in commit 2d38eb0ab9f78d68c083a5b78b1eca39027b279a. This check prevents the method from being set if it already exists (from a parent class). The fix is to always set the method when the field has choices, removing the hasattr check.
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--- a/django/db/models/fields/__init__.py
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+++ b/django/db/models/fields/__init__.py
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@@ -763,8 +763,7 @@ class Field(RegisterLookupMixin):
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if self.choices is not None:
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- if not hasattr(cls, 'get_%s_display' % self.name):
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- setattr(cls, 'get_%s_display' % self.name,
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- partialmethod(cls._get_FIELD_display, field=self))
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+ setattr(cls, 'get_%s_display' % self.name,
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+ partialmethod(cls._get_FIELD_display, field=self))
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