use strawberry dataLoader to solve N+1 query problem

app/graphql/context.py

@@ -1,10 +1,32 @@
+from app.models.user import User
+from app.auth.deps import get_current_user
 from fastapi import Request
 from strawberry.fastapi import BaseContext
+from strawberry.dataloader import DataLoader
+from typing import List
+from collections import defaultdict
 from app.db import SessionLocal
-from app.auth.deps import get_current_user
-from app.models import User
+from app.models import WorkspaceMember
+from app.graphql.types import WorkspaceMemberType
 from typing import AsyncGenerator
 
+# 定义批量查询函数：接收一组 workspace ID 列表，返回相同长度的结果列表
+async def load_members_by_workspace_ids(workspace_ids: List[str]) -> List[List[WorkspaceMember]]:
+    db = SessionLocal()
+    try:
+        # 用一条 IN 语句查出所有相关成员
+        members = db.query(WorkspaceMember).filter(WorkspaceMember.workspace_id.in_(workspace_ids)).all()
+        
+        # 将结果归类到对应的 workspace ID
+        member_map = defaultdict(list)
+        for member in members:
+            member_map[member.workspace_id].append(member)
+        
+        # 严格按照传入的 workspace ID 顺序返回结果列表
+        return [member_map[w_id] for w_id in workspace_ids]
+    finally:
+        db.close()
+
 class CustomContext(BaseContext):
     def __init__(self, request: Request):
         super().__init__(request)
@@ -18,6 +40,7 @@ class CustomContext(BaseContext):
         except Exception:
             return None
 
+
 async def get_context(request: Request) -> AsyncGenerator[CustomContext, None]:
     context = CustomContext(request)
     try: