Node.js 我一直在尝试用Mongoose解决nodeJS中的重复密钥问题，但没有任何效果

我正在尝试建立一个用户模型，但我想确保用户名和电子邮件是唯一的。当我创建第一个用户时，一切都正常，但是当我尝试创建具有相同信息的第二个用户时，我得到了一些错误，我可以在保存时处理这些错误，但是没有复制密钥来处理它

这是我的架构文件代码：

const UserSchema = new Schema({
    // this username with SchemaType of string
    username: {
        type: String,
        lowercase: true,
        required: [true, "username is required"],
        unique: true,
        trim: true,
        minlength: [4, "try to user longer name"],
        maxlength: [60, "your name is way too long"],
    },
    // virtual name
    name: {
        // name have two properties
        // first is first and refer to first-name
        // second is last and refer to last-name
        first: {
            type: String,
            lowercase: true,
            trim: true,
            minlength: 4,
            maxlength: 20
        },
        last: {
            type: String,
            lowercase: true,
            trim: true,
            minlength: 4,
            maxlength: 20
        }
    },
    password: {
        type: String,
        required: [true, "password is required"]
    },
    email: {
        type: String,
        required: [true, "email is required"],
        unique: true
    },
    active: {
        type: Boolean,
        default: true
    },
    admin: {
        type: Boolean,
        default: false
    },
    meta: {
        update: {
            type: Date,
            default: Date.now()
        },
        timestamp: {
            type: Date,
            default: Date.now()
        }
    }
});


UserSchema.virtual("fullname").get(function () {
    // return the concatenation of first and last
    return this.name.first + " " + this.name.last;
});

// Create User Model
const User = mongoose.model("User", UserSchema);

module.exports = User;

这是我试图处理的路由器代码：

router.post("/register", (request, response) => {
    const user = {
        username: request.body.username,
        email: request.body.email,
        password: request.body.password
    };

    if (!user.email && !user.username && !user.password) {
        return response.json({
            "message": "please fill the whole information"
        });
    }
    // put user info in model
    const newUser = new User({
        username: user.username,
        email: user.email,
        password: user.password
    })

    newUser.validate((err) => {
        console.log(err);
    });
    // save User in model
    newUser.save()
    // return response with info
    return response.status(201).json(user);
})

---

我认为这里的解释很简单。您正在为多个字段指定模式中的

unique

属性，因此mongo将不允许您使用相同的信息创建多个条目。这是很明显的

另外，我注意到你的代码有点不规则。您正在调用的save方法返回一个

承诺

，这意味着事件循环不会阻止您的代码，并且会立即返回响应。为此，您需要在

然后

块中处理响应，或者在整个代码中使用

异步等待

我建议作出以下修改：

router.post("/register", (request, response) => {
    const user = {
        username: request.body.username,
        email: request.body.email,
        password: request.body.password
    };

    if (!user.email && !user.username && !user.password) {
        return response.json({
            "message": "please fill the whole information"
        });
    }
    // put user info in model
    const newUser = new User({
        username: user.username,
        email: user.email,
        password: user.password
    })

    newUser.validate((err) => {
       if(err) {
         response.status(403).json({ message: 'Your custom error message' });
       }

       newUser.save().then(res => {
           return response.status(201).json(user);
       }).catch(e => {
           return response.status(500).json({ message: 'Your custom error message' });
       })
    });        
})

---

谢谢你的回答。这对我帮助很大，我错过了拯救的承诺，无论如何，谢谢你的努力