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Code Issues 32 Releases Wiki Activity

Fixed #25044 -- Fixed migrations for renaming ManyToManyField's through model.

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This commit is contained in:
Vytis Banaitis
2016-05-10 23:20:27 +03:00
committed by Tim Graham
parent 16a842b379
commit f1e408ff40
5 changed files with 95 additions and 0 deletions
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22
django/db/migrations/operations/models.py
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@@ -307,6 +307,28 @@ class RenameModel(ModelOperation):
new_fields.append((name, field))
state.models[related_key].fields = new_fields
state.reload_model(*related_key)
# Repoint M2Ms with through pointing to us
related_models = {
f.remote_field.model for f in model._meta.fields
if getattr(f.remote_field, 'model', None)
}
model_name = '%s.%s' % (app_label, self.old_name)
for related_model in related_models:
if related_model == model:
related_key = (app_label, self.new_name_lower)
else:
related_key = (related_model._meta.app_label, related_model._meta.model_name)
new_fields = []
changed = False
for name, field in state.models[related_key].fields:
if field.is_relation and field.many_to_many and field.remote_field.through == model_name:
field = field.clone()
field.remote_field.through = '%s.%s' % (app_label, self.new_name)
changed = True
new_fields.append((name, field))
if changed:
state.models[related_key].fields = new_fields
state.reload_model(*related_key)
state.reload_model(app_label, self.new_name_lower)
def database_forwards(self, app_label, schema_editor, from_state, to_state):