[RDBMS] az postgres flexible-server list: Add show cluster option f…

…or list command (#30398)

src/azure-cli/azure/cli/command_modules/rdbms/_params.py

@@ -622,6 +622,10 @@ def _flexible_server_params(command_group):
             c.argument('database_name', arg_type=database_name_arg_type)
             c.argument('yes', arg_type=yes_arg_type)
 
+        with self.argument_context('{} flexible-server list'.format(command_group)) as c:
+            c.argument('show_cluster', options_list=['--show-cluster'], required=False, action='store_true',
+                       help='Only show elastic clusters.')
+
         with self.argument_context('{} flexible-server delete'.format(command_group)) as c:
             c.argument('yes', arg_type=yes_arg_type)
 

src/azure-cli/azure/cli/command_modules/rdbms/flexible_server_custom_common.py

@@ -45,13 +45,21 @@ def flexible_server_update_set(client, resource_group_name, server_name, paramet
     return client.begin_update(resource_group_name, server_name, parameters)
 
 
-def server_list_custom_func(client, resource_group_name=None):
+def server_list_custom_func(client, resource_group_name=None, show_cluster=None):
     if not check_resource_group(resource_group_name):
         resource_group_name = None
 
+    servers = client.list()
+
     if resource_group_name:
-        return client.list_by_resource_group(resource_group_name)
-    return client.list()
+        servers = client.list_by_resource_group(resource_group_name)
+
+    if show_cluster:
+        servers = [s for s in servers if s.cluster is not None]
+    else:
+        servers = [s for s in servers if s.cluster is None]
+
+    return servers
 
 
 def firewall_rule_delete_func(cmd, client, resource_group_name, server_name, firewall_rule_name, yes=None):