Fix metadata in get_list() (#12906)

### What problem does this PR solve?

test_update_document.py failed as metadata is not included in the
response of get_list(), fix the issue.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

api/db/services/doc_metadata_service.py

@@ -28,6 +28,8 @@ from typing import Dict, List, Optional
 from api.db.db_models import DB, Document
 from common import settings
 from common.metadata_utils import dedupe_list
+from api.db.db_models import Knowledgebase
+from common.doc_store.doc_store_base import OrderByExpr
 
 
 class DocMetadataService:
@@ -57,7 +59,7 @@ class DocMetadataService:
         Returns:
             Simple metadata dictionary
         """
-        if not flat_meta:
+        if not flat_meta or not isinstance(flat_meta, dict):
             return {}
 
         meta_fields = flat_meta.get('meta_fields')
@@ -158,9 +160,6 @@ class DocMetadataService:
         Returns:
             Search results from ES/Infinity
         """
-        from api.db.db_models import Knowledgebase
-        from common.doc_store.doc_store_base import OrderByExpr
-
         kb = Knowledgebase.get_by_id(kb_id)
         if not kb:
             return None
@@ -247,8 +246,6 @@ class DocMetadataService:
             True if successful, False otherwise
         """
         try:
-            from api.db.db_models import Knowledgebase
-
             # Get document with tenant_id (need to join with Knowledgebase)
             doc_query = Document.select(Document, Knowledgebase.tenant_id).join(
                 Knowledgebase, on=(Knowledgebase.id == Document.kb_id)
@@ -304,6 +301,13 @@ class DocMetadataService:
             if result:
                 logging.error(f"Failed to insert metadata for document {doc_id}: {result}")
                 return False
+            # Force ES refresh to make metadata immediately available for search
+            if not settings.DOC_ENGINE_INFINITY:
+                try:
+                    settings.docStoreConn.es.indices.refresh(index=index_name)
+                    logging.debug(f"Refreshed metadata index: {index_name}")
+                except Exception as e:
+                    logging.warning(f"Failed to refresh metadata index {index_name}: {e}")
             
             logging.debug(f"Successfully inserted metadata for document {doc_id}")
             return True
@@ -329,8 +333,6 @@ class DocMetadataService:
             True if successful, False otherwise
         """
         try:
-            from api.db.db_models import Knowledgebase
-
             # Get document with tenant_id
             doc_query = Document.select(Document, Knowledgebase.tenant_id).join(
                 Knowledgebase, on=(Knowledgebase.id == Document.kb_id)
@@ -394,10 +396,7 @@ class DocMetadataService:
             True if successful (or no metadata to delete), False otherwise
         """
         try:
-            from api.db.db_models import Knowledgebase
-
             logging.debug(f"[METADATA DELETE] Starting metadata deletion for document: {doc_id}")
-
             # Get document with tenant_id
             doc_query = Document.select(Document, Knowledgebase.tenant_id).join(
                 Knowledgebase, on=(Knowledgebase.id == Document.kb_id)
@@ -494,8 +493,6 @@ class DocMetadataService:
             except Exception as e:
                 logging.warning(f"[DROP EMPTY TABLE] Count API failed, falling back to search: {e}")
                 # Fallback to search if count fails
-                from common.doc_store.doc_store_base import OrderByExpr
-
                 results = settings.docStoreConn.search(
                     select_fields=["id"],
                     highlight_fields=[],
@@ -564,8 +561,6 @@ class DocMetadataService:
             Metadata dictionary, empty dict if not found
         """
         try:
-            from api.db.db_models import Knowledgebase
-
             # Get document with tenant_id
             doc_query = Document.select(Document, Knowledgebase.tenant_id).join(
                 Knowledgebase, on=(Knowledgebase.id == Document.kb_id)
@@ -618,9 +613,6 @@ class DocMetadataService:
             Metadata dictionary in format: {field_name: {value: [doc_ids]}}
         """
         try:
-            from api.db.db_models import Knowledgebase
-            from common.doc_store.doc_store_base import OrderByExpr
-
             # Get tenant_id from first KB
             kb = Knowledgebase.get_by_id(kb_ids[0])
             if not kb:
@@ -697,9 +689,6 @@ class DocMetadataService:
             Metadata dictionary in format: {field_name: {value: [doc_ids]}}
         """
         try:
-            from api.db.db_models import Knowledgebase
-            from common.doc_store.doc_store_base import OrderByExpr
-
             # Get tenant_id from first KB
             kb = Knowledgebase.get_by_id(kb_ids[0])
             if not kb:

api/db/services/document_service.py

@@ -109,7 +109,12 @@ class DocumentService(CommonService):
 
         count = docs.count()
         docs = docs.paginate(page_number, items_per_page)
-        return list(docs.dicts()), count
+
+        docs_list = list(docs.dicts())
+        metadata_map = DocMetadataService.get_metadata_for_documents(None, kb_id)
+        for doc in docs_list:
+            doc["meta_fields"] = metadata_map.get(doc["id"], {})
+        return docs_list, count
 
     @classmethod
     @DB.connection_context()