Add cascade QP for delete octavia loadbalancer

Change-Id: I8f394639f3272d4385618dda6731880e02e85a4e

codegenerator/openapi/octavia.py

@@ -1129,11 +1129,12 @@ class OctaviaGenerator(OpenStackServerSourceBase):
             operation_name,
         )
 
+        qp: dict[str, Any] | None = None
+
         if operation_name in ["list", "index"]:
             # NOTE(gtema) sadly there is no reasonable way how to extract
             # supported query parameters out of octavia so we need to hardcode
             # them for now
-            qp: dict[str, Any] | None = None
             if path_resource_names == ["lbaas", "loadbalancers"]:
                 qp = LOADBALANCER_QUERY_PARAMETERS
             elif path_resource_names == ["lbaas", "listeners"]:
@@ -1161,8 +1162,22 @@ class OctaviaGenerator(OpenStackServerSourceBase):
             elif path_resource_names == ["lbaas", "providers"]:
                 qp = PROVIDER_QUERY_PARAMETERS
 
-            if qp:
-                query_params_versions.append((qp, None, None))
+        elif operation_name == "delete" and (
+            path_resource_names == ["lbaas", "loadbalancer"]
+            or path_resource_names == ["loadbalancer"]
+        ):
+            qp = {
+                "type": "object",
+                "properties": {
+                    "cascade": {
+                        "type": "boolean",
+                        "description": "If true will delete all child objects of the load balancer.",
+                    }
+                },
+            }
+
+        if qp:
+            query_params_versions.append((qp, None, None))
 
         return (
             query_params_versions,