#29691: Support ForeignKey based model inheritance
-------------------------------------+-------------------------------------
Reporter: James Pic | Owner: nobody
Type: New | Status: new
feature |
Component: Database | Version: 2.1
layer (models, ORM) |
Severity: Normal | Keywords:
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Currently, a model inheriting another will have a 1:1 relation with an
automatically managed OneToOneField. This means a parent model instance
may only have one child model instance. However, sometimes it may be
interresting to have several child model instances for one parent model
instance.
For example, creating a new child model with the same parent results in an
error like:
django.db.utils.IntegrityError: UNIQUE constraint failed:
djcall_call.callable_ptr_id
But overriding the parent field with a ForeignKey is not accepted:
django.core.exceptions.FieldError: Auto-generated field
'callable_ptr' in class 'Call' for parent_link to base class 'Callable'
clashes with declared field of the same name.
Can we perhaps add an exception (not Exception!) for child models that
override the automatic ptr field that is a OneToOneField, with a
ForeignKey ?
Thanks
--
Ticket URL: <https://code.djangoproject.com/ticket/29691>
Django <https://code.djangoproject.com/>
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