fix bug for fasetembed (infiniflow#392)

### What problem does this PR solve?

Issue link:infiniflow#325

### Type of change

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

api/apps/document_app.py

@@ -58,7 +58,7 @@ def upload():
         if not e:
             return get_data_error_result(
                 retmsg="Can't find this knowledgebase!")
-        if DocumentService.get_doc_count(kb.tenant_id) >= os.environ.get('MAX_FILE_NUM_PER_USER', 8192):
+        if DocumentService.get_doc_count(kb.tenant_id) >= int(os.environ.get('MAX_FILE_NUM_PER_USER', 8192)):
             return get_data_error_result(
                 retmsg="Exceed the maximum file number of a free user!")
 

api/db/services/llm_service.py

@@ -83,7 +83,12 @@ def model_instance(cls, tenant_id, llm_type,
                 llm = LLMService.query(llm_name=llm_name)
                 if llm and llm[0].fid in ["QAnything", "FastEmbed"]:
                     model_config = {"llm_factory": llm[0].fid, "api_key":"", "llm_name": llm_name, "api_base": ""}
-            if not model_config: raise LookupError("Model({}) not authorized".format(mdlnm))
+            if not model_config:
+                if llm_name == "flag-embedding":
+                    model_config = {"llm_factory": "Tongyi-Qianwen", "api_key": "",
+                                "llm_name": llm_name, "api_base": ""}
+                else:
+                    raise LookupError("Model({}) not authorized".format(mdlnm))
 
         if llm_type == LLMType.EMBEDDING.value:
             if model_config["llm_factory"] not in EmbeddingModel: