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Code Issues 32 Releases Wiki Activity

Fix AlterField migrations that are related to a RenameModel migration

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This commit is contained in:
Chris Beaven
2014-03-11 15:52:29 +13:00
parent 40f6ca54f8
commit 107c9f5453
2 changed files with 53 additions and 5 deletions
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17
django/db/migrations/operations/fields.py
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@@ -1,5 +1,6 @@
from django.db import router
from django.db.models.fields import NOT_PROVIDED
from django.utils import six
from .base import Operation
@@ -116,11 +117,17 @@ class AlterField(Operation):
from_model = from_state.render().get_model(app_label, self.model_name)
to_model = to_state.render().get_model(app_label, self.model_name)
if router.allow_migrate(schema_editor.connection.alias, to_model):
schema_editor.alter_field(
from_model,
from_model._meta.get_field_by_name(self.name)[0],
to_model._meta.get_field_by_name(self.name)[0],
)
from_field = from_model._meta.get_field_by_name(self.name)[0]
to_field = to_model._meta.get_field_by_name(self.name)[0]
# If the field is a relatedfield with an unresolved rel.to, just
# set it equal to the other field side. Bandaid fix for AlterField
# migrations that are part of a RenameModel change.
if from_field.rel and from_field.rel.to:
if isinstance(from_field.rel.to, six.string_types):
from_field.rel.to = to_field.rel.to
elif isinstance(to_field.rel.to, six.string_types):
to_field.rel.to = from_field.rel.to
schema_editor.alter_field(from_model, from_field, to_field)
def database_backwards(self, app_label, schema_editor, from_state, to_state):
self.database_forwards(app_label, schema_editor, from_state, to_state)