Fix Qdrant retriever RAG issue. (opea-project#1289)

* Fix Qdrant retriever no retrieved result issue.
Signed-off-by: letonghan <letong.han@intel.com>

Author: letonghan

comps/retrievers/deployment/docker_compose/compose.yaml

@@ -131,7 +131,7 @@ services:
       RETRIEVER_COMPONENT_NAME: ${RETRIEVER_COMPONENT_NAME:-OPEA_RETRIEVER_QDRANT}
       QDRANT_HOST: ${QDRANT_HOST}
       QDRANT_PORT: ${QDRANT_PORT}
-      INDEX_NAME: ${INDEX_NAME}
+      QDRANT_INDEX_NAME: ${INDEX_NAME}
     depends_on:
       qdrant-vector-db:
         condition: service_healthy

comps/retrievers/src/integrations/qdrant.py

@@ -3,6 +3,7 @@
 
 
 import os
+from types import SimpleNamespace
 
 from haystack_integrations.components.retrievers.qdrant import QdrantEmbeddingRetriever
 from haystack_integrations.document_stores.qdrant import QdrantDocumentStore
@@ -26,7 +27,7 @@ class OpeaQDrantRetriever(OpeaComponent):
     def __init__(self, name: str, description: str, config: dict = None):
         super().__init__(name, ServiceType.RETRIEVER.name.lower(), description, config)
 
-        self.retriever = self._initialize_client()
+        self.db_store, self.retriever = self._initialize_client()
         health_status = self.check_health()
         if not health_status:
             logger.error("OpeaQDrantRetriever health check failed.")
@@ -43,7 +44,7 @@ def _initialize_client(self) -> QdrantEmbeddingRetriever:
 
         retriever = QdrantEmbeddingRetriever(document_store=qdrant_store)
 
-        return retriever
+        return qdrant_store, retriever
 
     def check_health(self) -> bool:
         """Checks the health of the retriever service.
@@ -55,7 +56,7 @@ def check_health(self) -> bool:
             logger.info("[ check health ] start to check health of QDrant")
         try:
             # Check the status of the QDrant service
-            _ = self.retriever.client
+            _ = self.db_store.client
             logger.info("[ check health ] Successfully connected to QDrant!")
             return True
         except Exception as e:
@@ -75,6 +76,14 @@ async def invoke(self, input: EmbedDoc) -> list:
 
         search_res = self.retriever.run(query_embedding=input.embedding)["documents"]
 
+        # format result to align with the standard output in opea_retrievers_microservice.py
+        final_res = []
+        for res in search_res:
+            dict_res = res.meta
+            res_obj = SimpleNamespace(**dict_res)
+            final_res.append(res_obj)
+
         if logflag:
-            logger.info(f"[ similarity search ] search result: {search_res}")
-        return search_res
+            logger.info(f"[ similarity search ] search result: {final_res}")
+
+        return final_res

comps/retrievers/src/opea_retrievers_microservice.py

@@ -81,7 +81,8 @@ async def ingest_files(
                         r.metadata["b64_img_str"] = [input.base64_image, r.metadata["b64_img_str"]]
                     else:
                         r.metadata["b64_img_str"] = input.base64_image
-                metadata_list.append(r.metadata)
+                if r.metadata:
+                    metadata_list.append(r.metadata)
                 retrieved_docs.append(TextDoc(text=r.page_content))
             result = SearchedMultimodalDoc(
                 retrieved_docs=retrieved_docs, initial_query=input.text, metadata=metadata_list