text: # All Rights Reserved.
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  """refactor_credentials
  
  Revision ID: 92aaaa2a6bb3
  Revises: 4ef544102ba7
  Create Date: 2017-02-01 12:52:43.499663
  
  """
  from alembic import op
  import sqlalchemy as sa
  
  from rally.common.db import sa_types
  from rally import exceptions
  
  # revision identifiers, used by Alembic.
  revision = "92aaaa2a6bb3"
  down_revision = "4ef544102ba7"
  branch_labels = None
  depends_on = None
  
  
  deployments_helper = sa.Table(
      "deployments",
      sa.MetaData(),
      sa.Column("name", sa.String(255), unique=True),
      sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
      sa.Column("credentials", sa.PickleType, nullable=True),
      sa.Column("new_credentials", sa_types.MutableJSONEncodedDict,
                default={}, nullable=False)
  )
  
  
  def upgrade():
      with op.batch_alter_table("deployments") as batch_op:
          batch_op.add_column(
              sa.Column("new_credentials", sa_types.MutableJSONEncodedDict,
                        default={}))
  
      connection = op.get_bind()
      for deployment in connection.execute(deployments_helper.select()):
          creds = {}
          for cred_type, cred_obj in deployment.credentials:
              creds.setdefault(cred_type, [])
              creds[cred_type].append(cred_obj)
  
          connection.execute(
              deployments_helper.update().where(
                  deployments_helper.c.id == deployment.id).values(
                  new_credentials=creds))
  
      with op.batch_alter_table("deployments") as batch_op:
          batch_op.drop_column("credentials")
          batch_op.alter_column("new_credentials", new_column_name="credentials",
                                existing_type=sa_types.MutableJSONEncodedDict,
                                nullable=False)
  
  
  def downgrade():
      raise exceptions.DowngradeNotSupported()
  