Fixed #27310 -- Stopped rendering apps in RenameModel.state_forwards.
Thanks Tim for the review.
This commit is contained in:
Simon Charette
parent
8e3a72f4fb
commit
ecd625e830
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@ -3,6 +3,7 @@ from __future__ import unicode_literals
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from django.db import models
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from django.db.migrations.operations.base import Operation
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from django.db.migrations.state import ModelState
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from django.db.models.fields.related import RECURSIVE_RELATIONSHIP_CONSTANT
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from django.db.models.options import normalize_together
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from django.utils import six
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from django.utils.functional import cached_property
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@ -277,70 +278,50 @@ class RenameModel(ModelOperation):
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kwargs
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)
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def _get_model_tuple(self, remote_model, app_label, model_name):
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if remote_model == RECURSIVE_RELATIONSHIP_CONSTANT:
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return app_label, model_name.lower()
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elif '.' in remote_model:
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return tuple(remote_model.lower().split('.'))
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else:
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return app_label, remote_model.lower()
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def state_forwards(self, app_label, state):
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# In cases where state doesn't have rendered apps, prevent subsequent
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# reload_model() calls from rendering models for performance
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# reasons. This method should be refactored to avoid relying on
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# state.apps (#27310).
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reset_apps = 'apps' not in state.__dict__
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apps = state.apps
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model = apps.get_model(app_label, self.old_name)
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model._meta.apps = apps
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# Get all of the related objects we need to repoint
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all_related_objects = (
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f for f in model._meta.get_fields(include_hidden=True)
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if f.auto_created and not f.concrete and (not f.hidden or f.many_to_many)
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)
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if reset_apps:
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del state.__dict__['apps']
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# Rename the model
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state.models[app_label, self.new_name_lower] = state.models[app_label, self.old_name_lower]
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state.models[app_label, self.new_name_lower].name = self.new_name
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# Add a new model.
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renamed_model = state.models[app_label, self.old_name_lower].clone()
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renamed_model.name = self.new_name
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state.models[app_label, self.new_name_lower] = renamed_model
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# Repoint all fields pointing to the old model to the new one.
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old_model_tuple = app_label, self.old_name_lower
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new_remote_model = '%s.%s' % (app_label, self.new_name)
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for (model_app_label, model_name), model_state in state.models.items():
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model_changed = False
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for index, (name, field) in enumerate(model_state.fields):
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changed_field = None
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remote_field = field.remote_field
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if remote_field:
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remote_model_tuple = self._get_model_tuple(
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remote_field.model, model_app_label, model_name
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)
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if remote_model_tuple == old_model_tuple:
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changed_field = field.clone()
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changed_field.remote_field.model = new_remote_model
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through_model = getattr(remote_field, 'through', None)
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if through_model:
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through_model_tuple = self._get_model_tuple(
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through_model, model_app_label, model_name
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)
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if through_model_tuple == old_model_tuple:
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if changed_field is None:
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changed_field = field.clone()
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changed_field.remote_field.through = new_remote_model
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if changed_field:
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model_state.fields[index] = name, changed_field
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model_changed = True
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if model_changed:
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state.reload_model(model_app_label, model_name)
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# Remove the old model.
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state.remove_model(app_label, self.old_name_lower)
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# Repoint the FKs and M2Ms pointing to us
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for related_object in all_related_objects:
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if related_object.model is not model:
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# The model being renamed does not participate in this relation
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# directly. Rather, a superclass does.
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continue
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# Use the new related key for self referential related objects.
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if related_object.related_model == model:
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related_key = (app_label, self.new_name_lower)
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else:
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related_key = (
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related_object.related_model._meta.app_label,
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related_object.related_model._meta.model_name,
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)
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new_fields = []
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for name, field in state.models[related_key].fields:
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if name == related_object.field.name:
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field = field.clone()
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field.remote_field.model = "%s.%s" % (app_label, self.new_name)
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new_fields.append((name, field))
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state.models[related_key].fields = new_fields
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state.reload_model(*related_key)
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# Repoint M2Ms with through pointing to us
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related_models = {
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f.remote_field.model for f in model._meta.fields
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if getattr(f.remote_field, 'model', None)
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}
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model_name = '%s.%s' % (app_label, self.old_name)
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for related_model in related_models:
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if related_model == model:
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related_key = (app_label, self.new_name_lower)
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else:
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related_key = (related_model._meta.app_label, related_model._meta.model_name)
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new_fields = []
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changed = False
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for name, field in state.models[related_key].fields:
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if field.is_relation and field.many_to_many and field.remote_field.through == model_name:
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field = field.clone()
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field.remote_field.through = '%s.%s' % (app_label, self.new_name)
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changed = True
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new_fields.append((name, field))
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if changed:
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state.models[related_key].fields = new_fields
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state.reload_model(*related_key)
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state.reload_model(app_label, self.new_name_lower)
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def database_forwards(self, app_label, schema_editor, from_state, to_state):
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@ -624,9 +624,11 @@ class OperationTests(OperationTestBase):
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self.assertIn(("test_rmwsrf", "horserider"), new_state.models)
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# Remember, RenameModel also repoints all incoming FKs and M2Ms
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self.assertEqual(
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"test_rmwsrf.HorseRider",
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'self',
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new_state.models["test_rmwsrf", "horserider"].fields[2][1].remote_field.model
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)
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HorseRider = new_state.apps.get_model('test_rmwsrf', 'horserider')
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self.assertIs(HorseRider._meta.get_field('horserider').remote_field.model, HorseRider)
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# Test the database alteration
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self.assertTableExists("test_rmwsrf_rider")
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self.assertTableNotExists("test_rmwsrf_horserider")
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