Mongoose：自定义验证器的 isAsync 选项已弃用

Question

Stripe Rocket Rides demo 在验证器中使用 isAsync：

// Make sure the email has not been used.
PilotSchema.path('email').validate({
  isAsync: true,
  validator: function(email, callback) {
    const Pilot = mongoose.model('Pilot');
    // Check only when it is a new pilot or when the email has been modified.
    if (this.isNew || this.isModified('email')) {
      Pilot.find({ email: email }).exec(function(err, pilots) {
        callback(!err && pilots.length === 0);
      });
    } else {
      callback(true);
    }
  },
  message: 'This email already exists. Please try to log in instead.',
});

此方法使用引用引发错误

弃用警告：猫鼬：自定义验证器的 `isAsync` 选项已弃用。让您的异步验证器返回一个承诺：https://mongoosejs.com/docs/validation.html#async-custom-validators

引用的 MongoDB 页面有这个代码：

const userSchema = new Schema({
  name: {
    type: String,
    // You can also make a validator async by returning a promise.
    validate: () => Promise.reject(new Error('Oops!'))
  },
  email: {
    type: String,
    // There are two ways for an promise-based async validator to fail:
    // 1) If the promise rejects, Mongoose assumes the validator failed with the given error.
    // 2) If the promise resolves to `false`, Mongoose assumes the validator failed and creates an error with the given `message`.
    validate: {
      validator: () => Promise.resolve(false),
      message: 'Email validation failed'
    }
  }
});

我是 NodeJS 的新手，我不知道如何将 MongoDB 代码调整到 Rocket Rides 演示。 Implicit async custom validators (custom validators that take 2 arguments) are deprecated in mongoose >= 4.9.0 和 Mongoose custom validation for password 都没有帮助。

如何验证电子邮件地址的唯一性并避免该错误？

Answer 1

试试这个，我遇到了同样的问题。

要修复它，请使用您通过 await 调用的单独的异步函数。

// Make sure the email has not been used.
PilotSchema.path('email').validate({
    validator: async function(v) {
        return await checkMailDup(v, this);
    },
    message: 'This email already exists. Please try to log in instead.',
});

async function checkMailDup(v, t) {
  const Pilot = mongoose.model('Pilot');
  // Check only when it is a new pilot or when the email has been modified.
  if (t.isNew || t.isModified('email')) {
      try {
        const pilots = await Pilot.find({ email: v });
        return pilots.length === 0;
      } catch (err) {
        return false;
      }
  } else {
      return true;
  }
}

让我知道它是否有效。

我使用了以下参考资料：

• Mongoose async custom validation not working as expected

干杯！