Fix return metadata when searching for DingoDB (#12937)

docs/docs/integrations/vectorstores/dingo.ipynb

@@ -104,11 +104,11 @@
    "source": [
     "from dingodb import DingoDB\n",
     "\n",
-    "index_name = \"langchain-demo\"\n",
+    "index_name = \"langchain_demo\"\n",
     "\n",
     "dingo_client = DingoDB(user=\"\", password=\"\", host=[\"127.0.0.1:13000\"])\n",
     "# First, check if our index already exists. If it doesn't, we create it\n",
-    "if index_name not in dingo_client.get_index():\n",
+    "if index_name not in dingo_client.get_index() and index_name.upper() not in dingo_client.get_index():\n",
     "    # we create a new index, modify to your own\n",
     "    dingo_client.create_index(\n",
     "        index_name=index_name, dimension=1536, metric_type=\"cosine\", auto_id=False\n",

libs/langchain/langchain/vectorstores/dingo.py

@@ -66,7 +66,11 @@ class Dingo(VectorStore):
         self._text_key = text_key
         self._client = dingo_client
 
-        if index_name is not None and index_name not in dingo_client.get_index():
+        if (
+            index_name is not None
+            and index_name not in dingo_client.get_index()
+            and index_name.upper() not in dingo_client.get_index()
+        ):
             if self_id is True:
                 dingo_client.create_index(
                     index_name, dimension=dimension, auto_id=False
@@ -177,8 +181,9 @@ class Dingo(VectorStore):
             id = res["id"]
             score = res["distance"]
             text = metadatas[self._text_key]["fields"][0]["data"]
-
             metadata = {"id": id, "text": text, "score": score}
+            for meta_key in metadatas.keys():
+                metadata[meta_key] = metadatas[meta_key]["fields"][0]["data"]
             docs.append((Document(page_content=text, metadata=metadata), score))
 
         return docs
@@ -318,12 +323,20 @@ class Dingo(VectorStore):
             except ValueError as e:
                 raise ValueError(f"Dingo failed to connect: {e}")
         if kwargs is not None and kwargs.get("self_id") is True:
-            if index_name not in dingo_client.get_index():
+            if (
+                index_name is not None
+                and index_name not in dingo_client.get_index()
+                and index_name.upper() not in dingo_client.get_index()
+            ):
                 dingo_client.create_index(
                     index_name, dimension=dimension, auto_id=False
                 )
         else:
-            if index_name not in dingo_client.get_index():
+            if (
+                index_name is not None
+                and index_name not in dingo_client.get_index()
+                and index_name.upper() not in dingo_client.get_index()
+            ):
                 dingo_client.create_index(index_name, dimension=dimension)
 
         # Embed and create the documents