[Network] az network virtual-appliance migration: --migration-type is optional

src/azure-cli/azure/cli/command_modules/network/aaz/latest/network/virtual_appliance/migration/_commit.py

@@ -22,7 +22,7 @@ class Commit(AAZCommand):
     cannot be reversed with `abort`.
 
     :example: Commit the migration of a Network Virtual Appliance to the new internal load balancer (ILB) architecture.
-        az network virtual-appliance migration commit -n MyName -g MyRG --migration-type MigrateToNewILBArchitecture
+        az network virtual-appliance migration commit -n MyName -g MyRG
     """
 
     _aaz_info = {
@@ -65,8 +65,7 @@ def _build_arguments_schema(cls, *args, **kwargs):
         _args_schema.migration_type = AAZStrArg(
             options=["--migration-type"],
             arg_group="Properties",
-            help="The type of migration workflow to commit for the Network Virtual Appliance. Must match the type used in the prepare and execute phases.",
-            required=True,
+            help="The type of migration workflow to commit for the Network Virtual Appliance. If omitted, the migration defaults to MigrateToNewILBArchitecture. Otherwise, it must match the type used in the prepare and execute phases.",
             enum={"MigrateToNewILBArchitecture": "MigrateToNewILBArchitecture", "MigrateToNewOSVersion": "MigrateToNewOSVersion"},
         )
         return cls._args_schema
@@ -177,7 +176,7 @@ def content(self):
 
             properties = _builder.get(".properties")
             if properties is not None:
-                properties.set_prop("migrationType", AAZStrType, ".migration_type", typ_kwargs={"flags": {"required": True}})
+                properties.set_prop("migrationType", AAZStrType, ".migration_type")
 
             return self.serialize_content(_content_value)
 

src/azure-cli/azure/cli/command_modules/network/aaz/latest/network/virtual_appliance/migration/_execute.py

@@ -22,7 +22,7 @@ class Execute(AAZCommand):
     completes, run `commit` to finalize the migration or `abort` to roll it back.
 
     :example: Execute the migration of a Network Virtual Appliance to the new internal load balancer (ILB) architecture.
-        az network virtual-appliance migration execute -n MyName -g MyRG --migration-type MigrateToNewILBArchitecture
+        az network virtual-appliance migration execute -n MyName -g MyRG
     """
 
     _aaz_info = {
@@ -65,8 +65,7 @@ def _build_arguments_schema(cls, *args, **kwargs):
         _args_schema.migration_type = AAZStrArg(
             options=["--migration-type"],
             arg_group="Properties",
-            help="The type of migration workflow to execute for the Network Virtual Appliance. Must match the type used in the prepare phase.",
-            required=True,
+            help="The type of migration workflow to execute for the Network Virtual Appliance. If omitted, the migration defaults to MigrateToNewILBArchitecture. Otherwise, it must match the type used in the prepare phase.",
             enum={"MigrateToNewILBArchitecture": "MigrateToNewILBArchitecture", "MigrateToNewOSVersion": "MigrateToNewOSVersion"},
         )
         return cls._args_schema
@@ -177,7 +176,7 @@ def content(self):
 
             properties = _builder.get(".properties")
             if properties is not None:
-                properties.set_prop("migrationType", AAZStrType, ".migration_type", typ_kwargs={"flags": {"required": True}})
+                properties.set_prop("migrationType", AAZStrType, ".migration_type")
 
             return self.serialize_content(_content_value)
 

src/azure-cli/azure/cli/command_modules/network/aaz/latest/network/virtual_appliance/migration/_prepare.py

@@ -22,7 +22,7 @@ class Prepare(AAZCommand):
     stages the resources required to perform it.
 
     :example: Prepare a Network Virtual Appliance for migration to the new internal load balancer (ILB) architecture.
-        az network virtual-appliance migration prepare -n MyName -g MyRG --migration-type MigrateToNewILBArchitecture
+        az network virtual-appliance migration prepare -n MyName -g MyRG
     """
 
     _aaz_info = {
@@ -65,8 +65,7 @@ def _build_arguments_schema(cls, *args, **kwargs):
         _args_schema.migration_type = AAZStrArg(
             options=["--migration-type"],
             arg_group="Properties",
-            help="The type of migration workflow to prepare for the Network Virtual Appliance.",
-            required=True,
+            help="The type of migration workflow to prepare for the Network Virtual Appliance. If omitted, the migration defaults to MigrateToNewILBArchitecture.",
             enum={"MigrateToNewILBArchitecture": "MigrateToNewILBArchitecture", "MigrateToNewOSVersion": "MigrateToNewOSVersion"},
         )
         _args_schema.marketplace_version = AAZStrArg(
@@ -183,7 +182,7 @@ def content(self):
             properties = _builder.get(".properties")
             if properties is not None:
                 properties.set_prop("marketPlaceVersion", AAZStrType, ".marketplace_version")
-                properties.set_prop("migrationType", AAZStrType, ".migration_type", typ_kwargs={"flags": {"required": True}})
+                properties.set_prop("migrationType", AAZStrType, ".migration_type")
 
             return self.serialize_content(_content_value)
 

src/azure-cli/azure/cli/command_modules/network/tests/latest/test_network_commands.py

@@ -8859,7 +8859,6 @@ def test_network_virtual_appliance_migration(self, resource_group):
             'nva_name': 'clivirtualappliancemigration',  # NVA name
             'rg': resource_group,
             'subscription': subscriptionId,
-            'migration_type': 'MigrateToNewILBArchitecture',
         })
 
         # Add the required extension
@@ -8895,7 +8894,7 @@ def test_network_virtual_appliance_migration(self, resource_group):
                  ])
 
         # Phase 1: prepare the migration to the new ILB architecture
-        self.cmd('network virtual-appliance migration prepare -g {rg} -n {nva_name} --migration-type {migration_type}')
+        self.cmd('network virtual-appliance migration prepare -g {rg} -n {nva_name}')
 
         provisioning_state = self.cmd('network virtual-appliance show -g {rg} -n {nva_name}').get_output_in_json()['provisioningState']
         retry_count = 0
@@ -8907,7 +8906,7 @@ def test_network_virtual_appliance_migration(self, resource_group):
             provisioning_state = self.cmd('network virtual-appliance show -g {rg} -n {nva_name}').get_output_in_json()['provisioningState']
 
         # Phase 2: execute the migration
-        self.cmd('network virtual-appliance migration execute -g {rg} -n {nva_name} --migration-type {migration_type}')
+        self.cmd('network virtual-appliance migration execute -g {rg} -n {nva_name}')
 
         provisioning_state = self.cmd('network virtual-appliance show -g {rg} -n {nva_name}').get_output_in_json()['provisioningState']
         retry_count = 0
@@ -8919,7 +8918,7 @@ def test_network_virtual_appliance_migration(self, resource_group):
             provisioning_state = self.cmd('network virtual-appliance show -g {rg} -n {nva_name}').get_output_in_json()['provisioningState']
 
         # Phase 3: commit the migration to finalize the new ILB architecture
-        self.cmd('network virtual-appliance migration commit -g {rg} -n {nva_name} --migration-type {migration_type}')
+        self.cmd('network virtual-appliance migration commit -g {rg} -n {nva_name}')
 
         # Ensure that the provisioning state is 'Succeeded' after committing the migration
         provisioning_state = self.cmd('network virtual-appliance show -g {rg} -n {nva_name}').get_output_in_json()['provisioningState']

src/azure-cli/azure/cli/command_modules/network/tests/latest/test_network_unit_tests.py

@@ -24,6 +24,39 @@ def test_application_gateway_subresource_preserves_hsm_schema(self):
             self.assertIsNotNone(hsm.key_id)
             self.assertIsNotNone(hsm.public_cert_data)
 
+    def test_virtual_appliance_ilb_migration_allows_null_body(self):
+        from azure.cli.core.aaz._command_ctx import AAZCommandCtx
+        from azure.cli.core.mock import DummyCli
+        from azure.cli.command_modules.network.aaz.latest.network.virtual_appliance.migration import (
+            Commit, Execute, Prepare)
+
+        commands = (
+            (Prepare, Prepare.NetworkVirtualAppliancesPrepareMigration),
+            (Execute, Execute.NetworkVirtualAppliancesExecuteMigration),
+            (Commit, Commit.NetworkVirtualAppliancesCommitMigration),
+        )
+        for command, operation_type in commands:
+            schema = command._build_arguments_schema()
+            self.assertFalse(schema.migration_type.to_cmd_arg('migration_type').type.settings['required'])
+
+            with self.subTest(command=command.__name__, body='null'):
+                ctx = AAZCommandCtx(DummyCli(), schema, {})
+                operation = object.__new__(operation_type)
+                operation.ctx = ctx
+                self.assertIsNone(operation.content)
+
+            with self.subTest(command=command.__name__, body='explicit'):
+                ctx = AAZCommandCtx(DummyCli(), schema, {
+                    'migration_type': 'MigrateToNewOSVersion',
+                })
+                operation = object.__new__(operation_type)
+                operation.ctx = ctx
+                self.assertEqual(operation.content, {
+                    'properties': {
+                        'migrationType': 'MigrateToNewOSVersion',
+                    }
+                })
+
     def test_network_get_nic_ip_config(self):
         from azure.cli.command_modules.network.custom import _get_nic_ip_config