对传入参数merchantid 进行存在检测。

app/api/endpoints/merchant_product.py

@@ -11,16 +11,26 @@ from app.models.database import get_db
 from app.api.deps import get_admin_user
 from app.models.user import UserDB
 from app.core.response import success_response, error_response, ResponseModel
+from app.models.merchant import MerchantDB
 
 router = APIRouter()
 
 @router.post("", response_model=ResponseModel)
-async def create_product(
+async def create_merchant_product(
     product: MerchantProductCreate,
     db: Session = Depends(get_db),
     admin: UserDB = Depends(get_admin_user)
 ):
     """创建商家产品（管理员）"""
+    
+    # 检查商家是否存在
+    merchant = db.query(MerchantDB).filter(
+        MerchantDB.id == product.merchant_id
+    ).first()
+    
+    if not merchant:
+        return error_response(code=404, message="商家不存在")
+    
     db_product = MerchantProductDB(**product.model_dump())
     db.add(db_product)