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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: neutron
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1312124

Title:
  Downgrade doesn't work in 4eca4a84f08a_remove_ml2_cisco_cred_db
  migration

Status in OpenStack Neutron (virtual network service):
  Fix Released

Bug description:
  In downgrade for 4eca4a84f08a_remove_ml2_cisco_cred_db there is a
  mistake in usage SQLAlchemy String type. Used sa.string instead of
  sa.String

  akamyshnikova@akamyshnikova:/opt/stack/neutron$ neutron-db-manage --config-file /etc/neutron/neutron.conf --config-file /etc/neutron/plugins/ml2/ml2_conf.ini downgrade -10
  INFO  [alembic.migration] Context impl MySQLImpl.
  INFO  [alembic.migration] Will assume non-transactional DDL.
  INFO  [alembic.migration] Running downgrade 1dde83e0359e -> 26a933acf533, add_index_psql_cisco
  INFO  [alembic.migration] Running downgrade 26a933acf533 -> 30231c78a878, add_index_psql_packetfilter
  INFO  [alembic.migration] Running downgrade 30231c78a878 -> 168ce7333432, add_index_psql_metering
  INFO  [alembic.migration] Running downgrade 168ce7333432 -> 6be312499f9, add_index_psql_fwaas
  INFO  [alembic.migration] Running downgrade 6be312499f9 -> d06e871c0d5, set_not_null_vlan_id_cisco
  INFO  [alembic.migration] Running downgrade d06e871c0d5 -> 4eca4a84f08a, set_admin_state_up_not_null_ml2
  INFO  [alembic.migration] Running downgrade 4eca4a84f08a -> 33c3db036fe4, Remove ML2 Cisco Credentials DB
  Traceback (most recent call last):
    File "/usr/local/bin/neutron-db-manage", line 10, in <module>
      sys.exit(main())
    File "/opt/stack/neutron/neutron/db/migration/cli.py", line 167, in main
      CONF.command.func(config, CONF.command.name)
    File "/opt/stack/neutron/neutron/db/migration/cli.py", line 81, in do_upgrade_downgrade
      do_alembic_command(config, cmd, revision, sql=CONF.command.sql)
    File "/opt/stack/neutron/neutron/db/migration/cli.py", line 59, in do_alembic_command
      getattr(alembic_command, cmd)(config, *args, **kwargs)
    File "/usr/local/lib/python2.7/dist-packages/alembic/command.py", line 150, in downgrade
      script.run_env()
    File "/usr/local/lib/python2.7/dist-packages/alembic/script.py", line 199, in run_env
      util.load_python_file(self.dir, 'env.py')
    File "/usr/local/lib/python2.7/dist-packages/alembic/util.py", line 205, in load_python_file
      module = load_module_py(module_id, path)
    File "/usr/local/lib/python2.7/dist-packages/alembic/compat.py", line 58, in load_module_py
      mod = imp.load_source(module_id, path, fp)
    File "/opt/stack/neutron/neutron/db/migration/alembic_migrations/env.py", line 103, in <module>
      run_migrations_online()
    File "/opt/stack/neutron/neutron/db/migration/alembic_migrations/env.py", line 87, in run_migrations_online
      options=build_options())
    File "<string>", line 7, in run_migrations
    File "/usr/local/lib/python2.7/dist-packages/alembic/environment.py", line 681, in run_migrations
      self.get_context().run_migrations(**kw)
    File "/usr/local/lib/python2.7/dist-packages/alembic/migration.py", line 225, in run_migrations
      change(**kw)
    File "/opt/stack/neutron/neutron/db/migration/alembic_migrations/versions/4eca4a84f08a_remove_ml2_cisco_cred_db.py", line 53, in downgrade
      sa.Column('credential_id', sa.string(length=255), nullable=True),
  AttributeError: 'module' object has no attribute 'string'

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