[fix]pydantic to dict when build prompt (#967)

Author: SangChengC

lightllm/server/api_openai.py

@@ -101,8 +101,6 @@ async def chat_completions_impl(request: ChatCompletionRequest, raw_request: Req
                             "Unrecognized image input. Supports local path, http url, base64, and PIL.Image."
                         )
 
-            message.content = "\n".join(texts)
-
     tools = None
     if request.tools and request.tool_choice != "none":
         # request.skip_special_tokens = False

lightllm/server/build_prompt.py

@@ -10,7 +10,8 @@ def init_tokenizer(args):
 
 async def build_prompt(request, tools) -> str:
     global tokenizer
-    messages = request.messages
+    # pydantic格式转成dict， 否则，当根据tokenizer_config.json拼template时，Jinja判断无法识别
+    messages = [m.model_dump(by_alias=True, exclude_none=True) for m in request.messages]
     kwargs = {"conversation": messages}
     if request.character_settings:
         kwargs["character_settings"] = request.character_settings