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Code Issues 25 Releases Wiki Activity

Fixed #22889: Unneeded to_field in fk.deconstruct causing swap issues

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This commit is contained in:
Andrew Godwin 2014-06-23 20:39:17 -07:00
parent 0fba4c0ed7
commit 0b571753a8
2 changed files with 11 additions and 1 deletions
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3
django/db/models/fields/related.py
View File

@ -1673,7 +1673,8 @@ class ForeignKey(ForeignObject):
if self.rel.on_delete is not CASCADE:
kwargs['on_delete'] = self.rel.on_delete
# Rel needs more work.
if self.rel.field_name:
to_meta = getattr(self.rel.to, "_meta", None)
if self.rel.field_name and (not to_meta or (to_meta.pk and self.rel.field_name != to_meta.pk.name)):
kwargs['to_field'] = self.rel.field_name
return name, path, args, kwargs

9
tests/field_deconstruction/tests.py
View File

@ -169,7 +169,10 @@ class FieldDeconstructionTests(TestCase):
def test_foreign_key(self):
# Test basic pointing
from django.contrib.auth.models import Permission
field = models.ForeignKey("auth.Permission")
field.rel.to = Permission
field.rel.field_name = "id"
name, path, args, kwargs = field.deconstruct()
self.assertEqual(path, "django.db.models.ForeignKey")
self.assertEqual(args, [])
@ -194,6 +197,12 @@ class FieldDeconstructionTests(TestCase):
self.assertEqual(path, "django.db.models.ForeignKey")
self.assertEqual(args, [])
self.assertEqual(kwargs, {"to": "auth.User", "on_delete": models.SET_NULL})
# Test to_field preservation
field = models.ForeignKey("auth.Permission", to_field="foobar")
name, path, args, kwargs = field.deconstruct()
self.assertEqual(path, "django.db.models.ForeignKey")
self.assertEqual(args, [])
self.assertEqual(kwargs, {"to": "auth.Permission", "to_field": "foobar"})
@override_settings(AUTH_USER_MODEL="auth.Permission")
def test_foreign_key_swapped(self):