Comment 1 for bug 1582649

The issue is with a floatingip resource with definition:

api_pool_floating:
    type: OS::Neutron::FloatingIP
    depends_on:
      - extrouter_inside
    properties:
      floating_network: {get_param: external_network}
      port_id: {get_attr: [api_pool, vip, port_id]}

When creating the floating IP, heat is not able to resolve the port_id. We have a similar test case with neutron autoscaling LB (test_autoscaling_lb.py) scenario test but it works: https://github.com/openstack/heat/blob/master/heat_integrationtests/scenario/templates/test_autoscaling_lb_neutron.yaml#L97

The difference is with the template version, magnum uses version 2013-05-23 and the neutron autoscaling LB test uses template of version 2015-04-30

In hot template version 2013-05-23 the get_attr is mapped to GetAttrThenSelect function and all other versions it is mapped to GetAttr function. Looks like the problem is with GetAttrThenSelect function.