fix error weaviate vector (#1058)

Co-authored-by: jyong <jyong@dify.ai>

api/commands.py

@@ -329,16 +329,23 @@ def create_qdrant_indexes():
                                 model_name=dataset.embedding_model
                             )
                         except Exception:
-                            provider = Provider(
-                                id='provider_id',
-                                tenant_id=dataset.tenant_id,
-                                provider_name='openai',
-                                provider_type=ProviderType.CUSTOM.value,
-                                encrypted_config=json.dumps({'openai_api_key': 'TEST'}),
-                                is_valid=True,
-                            )
-                            model_provider = OpenAIProvider(provider=provider)
-                            embedding_model = OpenAIEmbedding(name="text-embedding-ada-002", model_provider=model_provider)
+                            try:
+                                embedding_model = ModelFactory.get_embedding_model(
+                                    tenant_id=dataset.tenant_id
+                                )
+                                dataset.embedding_model = embedding_model.name
+                                dataset.embedding_model_provider = embedding_model.model_provider.provider_name
+                            except Exception:
+                                provider = Provider(
+                                    id='provider_id',
+                                    tenant_id=dataset.tenant_id,
+                                    provider_name='openai',
+                                    provider_type=ProviderType.SYSTEM.value,
+                                    encrypted_config=json.dumps({'openai_api_key': 'TEST'}),
+                                    is_valid=True,
+                                )
+                                model_provider = OpenAIProvider(provider=provider)
+                                embedding_model = OpenAIEmbedding(name="text-embedding-ada-002", model_provider=model_provider)
                         embeddings = CacheEmbedding(embedding_model)
 
                         from core.index.vector_index.qdrant_vector_index import QdrantVectorIndex, QdrantConfig