feat: enhance knowledge retrieval with JSON metadata support

Author: liuruibin

apps/knowledge/serializers/knowledge.py

@@ -1,4 +1,5 @@
 import io
+import json
 import logging
 import os
 import re
@@ -288,9 +289,11 @@ def one(self):
                 'folder_query_set': QuerySet(KnowledgeFolder)
             }
             all_application_list = [str(adm.get('id')) for adm in self.list_application(with_valid=False)]
+            knowledge_dict = native_search(query_set_dict, select_string=get_file_content(
+                os.path.join(PROJECT_DIR, "apps", "knowledge", 'sql', 'list_knowledge.sql')), with_search_one=True)
             return {
-                **native_search(query_set_dict, select_string=get_file_content(
-                    os.path.join(PROJECT_DIR, "apps", "knowledge", 'sql', 'list_knowledge.sql')), with_search_one=True),
+                **knowledge_dict,
+                'meta': json.loads(knowledge_dict.get('meta', '{}')),
                 'application_id_list': list(filter(
                     lambda application_id: all_application_list.__contains__(application_id),
                     [

apps/knowledge/sql/list_knowledge.sql

@@ -13,6 +13,7 @@ FROM (SELECT "temp_knowledge".id::text, "temp_knowledge".name,
              "temp_knowledge"."scope",
              "temp_knowledge"."embedding_model_id"::text,
              "document_temp"."char_length",
+             to_json("temp_knowledge".meta)::jsonb       as meta,
              CASE
                  WHEN
                      "app_knowledge_temp"."count" IS NULL THEN 0
@@ -43,6 +44,7 @@ FROM (SELECT "temp_knowledge".id::text, "temp_knowledge".name,
              'WORKSPACE' as "scope",
              ''          as "embedding_model_id",
              0 as char_length,
+             '{}'::jsonb as meta,
                 0 as application_mapping_count,
                 0 as document_count
       from knowledge_folder ${folder_query_set}) temp