#28824: Allow different Foreign Keys to share same underlying DB column
-------------------------------------+-------------------------------------
Reporter: klass- | Owner: nobody
ivan |
Type: New | Status: new
feature |
Component: Database | Version: 1.11
layer (models, ORM) | Keywords: foreigh key,
Severity: Normal | db_column,
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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{{{
class A(Model):
uid = CharField(unique=True)
# other fields
class B(Model):
uid = CharField(unique=True)
# other fields
class C(Model):
# other fields
uid = CharField(unique=False)
a = ForeignKey(to=A, to_field='uid', db_column='uid', null=True)
b = ForeignKey(to=B, to_field='uid', db_column='uid', null=True)
}}}
Gives an error:
{{{
Field 'b' has column name 'uid' that is used by another field.
HINT: Specify a 'db_column' for the field.
}}}
However, ForeignKey field is a ORM relation based on underlying column
anyway.
I think it won't break anything if we allow different foreign keys to
share same underlying column.
This adds more flexibility and will allow better django "on-boarding"
process for legacy projects.
It will be also useful when A or B is proxy model - so we can get
different proxy objects by different foreign keys referencing same DB row.
Another example can be found here:
[https://stackoverflow.com/questions/36911804/django-use-same-column-for-
two-foreign-keys]
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Ticket URL: <https://code.djangoproject.com/ticket/28824>
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