NodeJs：MongoServerError：事务编号仅允许在副本集成员或 mongos 上

Question

！当我由特定用户创建博客时，发生与 mongoServer 相关的错误。 ！这是我的创建博客 API代码：

//Create blog....
const creatBlogs = async(req, res)=>{
    const {title, description, image,user} = req.body
    try {
        let existingUser = await userModel.findById(user)
        console.log(existingUser);
        if(!existingUser){
            return res.status(404).json({message:"Unable to find User by this id"})
        }
        if(!title || !description){
            return res.status(400).json({message:"Missing some fields"})
        }
        const newBlog = new Blog({
            title,
            description,
            image,
            user
        });
        console.log(newBlog);
        const session = await mongoose.startSession();
        session.startTransaction();
        await newBlog.save({session})
        existingUser.blogs.push(newBlog)
        await existingUser.save({session})
        await session.commitTransaction();

        return res.status(201).json({newBlog:newBlog})

    } catch (error) {
        console.log("Error occured", error);
    }
}

输出：发生错误 MongoServerError：事务号仅允许在副本集成员或 mongos 上

Answer 1

我假设您在不允许事务的独立 mongo 服务器上运行应用程序。您应该配置副本集或分片集群来处理事务。请参阅此处