text: #    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.
  
  from neutron_lib.db import model_base
  import sqlalchemy as sa
  from sqlalchemy import orm
  
  from neutron.db.models import agent as agent_model
  
  
  class NetworkDhcpAgentBinding(model_base.BASEV2):
      """Represents binding between neutron networks and DHCP agents."""
  
      network_id = sa.Column(sa.String(36),
                             sa.ForeignKey("networks.id", ondelete='CASCADE'),
                             primary_key=True)
      dhcp_agent = orm.relation(agent_model.Agent)
      dhcp_agent_id = sa.Column(sa.String(36),
                                sa.ForeignKey("agents.id",
                                              ondelete='CASCADE'),
                                primary_key=True)
  