fix(json_api): correctly find id before retrieving related_url (#162)

Author: jbarreau

src/agent_toolkit/forestadmin/agent_toolkit/services/serializers/json_api.py

@@ -155,10 +155,12 @@ def schema(self) -> "ForestSchema":
         )
 
     def get_related_url(self, obj: Any):
-        if "data" in obj:
+        if "id" in obj:
+            obj["__forest_id__"] = obj["id"]
+        elif "data" in obj:
             obj["__forest_id__"] = obj["data"]["id"]
         else:
-            obj["__forest_id__"] = obj["id"]
+            raise JsonApiException("Cannot find json api 'id' in given obj.")
         res: Any = super(ForestRelationShip, self).get_related_url(obj)  # type: ignore
         del obj["__forest_id__"]
         return {"href": res}