id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 22332 intra-app dependencies from models with circular references cause exceptions on database creation bernie_sumption nobody "Here is some minimal sample code that triggers this bug. Create a new project and a new app called ""bug"", then add this code to bug/models.py: {{{#!python from django.db import models class A(models.Model): intra_app_fk = models.ForeignKey(""contenttypes.ContentType"") circular_fk = models.ForeignKey(""bug.A"") }}} Run `python manage.py makemigrations` and `python manage.py test`, and it will fail with the stack trace below. Notes: * there's nothing special about contenttypes.ContentType. If you create a second app in the same project with a model called ""B"" and try to create a FK relationship to B, it will fail with the same error * It does however have to be an intra-app relationship. Creating a model ""B"" in the same models.py does not trigger the bug * `circular_fk` does not have to be a self-reference. It can be a circular reference that passes through another model Full stack trace: {{{ Creating test database for alias 'default'... Traceback (most recent call last): File ""manage.py"", line 10, in execute_from_command_line(sys.argv) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/core/management/__init__.py"", line 427, in execute_from_command_line utility.execute() File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/core/management/__init__.py"", line 419, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/core/management/commands/test.py"", line 50, in run_from_argv super(Command, self).run_from_argv(argv) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/core/management/base.py"", line 288, in run_from_argv self.execute(*args, **options.__dict__) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/core/management/commands/test.py"", line 71, in execute super(Command, self).execute(*args, **options) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/core/management/base.py"", line 337, in execute output = self.handle(*args, **options) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/core/management/commands/test.py"", line 88, in handle failures = test_runner.run_tests(test_labels) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/test/runner.py"", line 147, in run_tests old_config = self.setup_databases() File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/test/runner.py"", line 109, in setup_databases return setup_databases(self.verbosity, self.interactive, **kwargs) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/test/runner.py"", line 297, in setup_databases verbosity, autoclobber=not interactive) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/backends/creation.py"", line 368, in create_test_db test_database=True) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/core/management/__init__.py"", line 167, in call_command return klass.execute(*args, **defaults) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/core/management/base.py"", line 337, in execute output = self.handle(*args, **options) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/core/management/commands/migrate.py"", line 145, in handle executor.migrate(targets, plan, fake=options.get(""fake"", False)) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/migrations/executor.py"", line 60, in migrate self.apply_migration(migration, fake=fake) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/migrations/executor.py"", line 94, in apply_migration migration.apply(project_state, schema_editor) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/migrations/migration.py"", line 97, in apply operation.database_forwards(self.app_label, schema_editor, project_state, new_state) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/migrations/operations/models.py"", line 28, in database_forwards schema_editor.create_model(model) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/backends/schema.py"", line 191, in create_model definition, extra_params = self.column_sql(model, field) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/backends/schema.py"", line 108, in column_sql db_params = field.db_parameters(connection=self.connection) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/models/fields/related.py"", line 1758, in db_parameters return {""type"": self.db_type(connection), ""check"": []} File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/models/fields/related.py"", line 1749, in db_type rel_field = self.related_field File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/models/fields/related.py"", line 1655, in related_field return self.foreign_related_fields[0] File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/models/fields/related.py"", line 1414, in foreign_related_fields return tuple(rhs_field for lhs_field, rhs_field in self.related_fields) File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/models/fields/related.py"", line 1401, in related_fields self._related_fields = self.resolve_related_fields() File ""/Users/bernie/.virtualenvs/mgerp/lib/python2.7/site-packages/django/db/models/fields/related.py"", line 1386, in resolve_related_fields raise ValueError('Related model %r cannot be resolved' % self.rel.to) ValueError: Related model 'contenttypes.ContentType' cannot be resolved }}}" Uncategorized closed Migrations 1.7-beta-1 Normal duplicate loic@… Unreviewed 0 0 0 0 0 0