🐛 fix(loading.py): convert retriever to retriever object if it has "as_retriever" method

The code now checks if the "retriever" key exists in the params dictionary and if the value has an "as_retriever" method. If it does, the value is replaced with the result of calling the "as_retriever" method. This change ensures that the "retriever" parameter is always an instance of the retriever object, preventing potential attribute errors later in the code.

src/backend/langflow/interface/initialize/loading.py

@@ -100,6 +100,8 @@ def instantiate_llm(node_type, class_object, params: Dict):
 
 def instantiate_memory(node_type, class_object, params):
     try:
+        if "retriever" in params and hasattr(params["retriever"], "as_retriever"):
+            params["retriever"] = params["retriever"].as_retriever()
         return class_object(**params)
     # I want to catch a specific attribute error that happens
     # when the object does not have a cursor attribute