Add the flavor-id option to router create

The --flavor-id option is added to the router create command. The
flavor_id attribute has been supported by the Neutron API for router
POST operations since a long time ago [0].

Partial-Bug: #2020823

[0] https://review.opendev.org/c/openstack/neutron-lib/+/494289

Change-Id: If88499533a92c09e67b0827d1d64156682a3bb8e

openstackclient/network/v2/router.py

@@ -139,6 +139,9 @@ def _get_attrs(client_manager, parsed_args):
                 ips.append(ip_spec)
             gateway_info['external_fixed_ips'] = ips
         attrs['external_gateway_info'] = gateway_info
+    # "router set" command doesn't support setting flavor_id.
+    if 'flavor_id' in parsed_args and parsed_args.flavor_id is not None:
+        attrs['flavor_id'] = parsed_args.flavor_id
 
     return attrs
 
@@ -399,6 +402,11 @@ class CreateRouter(command.ShowOne, common.NeutronCommandWithExtraArgs):
             action='store_false',
             help=_("Disable IPv6 NDP proxy on external gateway"),
         )
+        parser.add_argument(
+            '--flavor-id',
+            metavar='<flavor-id>',
+            help=_("Associate the router to a flavor by ID"),
+        )
 
         return parser
 

openstackclient/tests/unit/network/v2/test_router.py

@@ -379,6 +379,32 @@ class TestCreateRouter(TestRouter):
     def test_create_with_no_tag(self):
         self._test_create_with_tag(add_tags=False)
 
+    def test_create_with_flavor_id(self):
+        _flavor = network_fakes.create_one_network_flavor()
+        arglist = [
+            self.new_router.name,
+            '--flavor-id',
+            _flavor.id,
+        ]
+        verifylist = [
+            ('name', self.new_router.name),
+            ('enable', True),
+            ('distributed', False),
+            ('ha', False),
+            ('flavor_id', _flavor.id),
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+        columns, data = self.cmd.take_action(parsed_args)
+        self.network.create_router.assert_called_once_with(
+            **{
+                'admin_state_up': True,
+                'name': self.new_router.name,
+                'flavor_id': _flavor.id,
+            }
+        )
+        self.assertEqual(self.columns, columns)
+        self.assertCountEqual(self.data, data)
+
 
 class TestDeleteRouter(TestRouter):
     # The routers to delete.

releasenotes/notes/add-flavor-id-to-router-create-76e916e129b5b80c.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Add the ``--flavor-id`` option to the ``router create`` command.