feat: support specifying datasource ID in MCP question

backend/apps/chat/models/chat_model.py

@@ -329,7 +329,7 @@ class McpQuestion(BaseModel):
     token: str = Body(description='token')
     stream: Optional[bool] = Body(description='是否流式输出，默认为true开启, 关闭false则返回JSON对象', default=True)
     lang: Optional[str] = Body(description='语言：zh-CN|en|ko-KR', default='zh-CN')
-    datasource_id: Optional[int] = Body(description='数据源ID，仅当当前对话没有确定数据源时有效', default=None)
+    datasource_id: Optional[int | str] = Body(description='数据源ID，仅当当前对话没有确定数据源时有效', default=None)
 
 
 class AxisObj(BaseModel):

backend/apps/mcp/mcp.py

@@ -2,6 +2,7 @@
 # Date: 2025/7/1
 import json
 from datetime import timedelta
+from typing import Optional
 
 import jwt
 from fastapi import HTTPException, status, APIRouter
@@ -113,8 +114,22 @@ async def mcp_start(session: SessionDep, chat: ChatStart):
 @router.post("/mcp_question", operation_id="mcp_question")
 async def mcp_question(session: SessionDep, chat: McpQuestion):
     session_user = get_user(session, chat.token)
+    ds_id: Optional[int] = None
+    if chat.datasource_id:
+        if isinstance(chat.datasource_id, str):
+            if chat.datasource_id.strip() == "":
+                ds_id = None
+            else:
+                try:
+                    ds_id = int(chat.datasource_id.strip())
+                except ValueError:
+                    raise HTTPException(status_code=400, detail="Invalid datasource ID")
+        elif isinstance(chat.datasource_id, int):
+            ds_id = chat.datasource_id
+        else:
+            raise HTTPException(status_code=400, detail="Invalid datasource ID")
 
-    mcp_chat = ChatMcp(token=chat.token, chat_id=chat.chat_id, question=chat.question, datasource_id=chat.datasource_id)
+    mcp_chat = ChatMcp(token=chat.token, chat_id=chat.chat_id, question=chat.question, datasource_id=ds_id)
 
     return await question_answer_inner(session=session, current_user=session_user, request_question=mcp_chat,
                                        in_chat=False, stream=chat.stream)