如何根据特定条件在猫鼬验证中创建错误数组？

Question

我正在尝试根据特定条件生成错误数组，我该如何实现，邮递员指出：“无法读取未定义的属性（读取 'push'）”

  username: {
    type: String,
    required: [true, "username is required"],
    // minlength: 6,
    unique: true,
    // match: [
    //   /^(?=.{3,20}$)(?![_.])(?!.*[_.]{2})[a-zA-Z0-9._]+(?<![_.])$/,
    //   "username shouldn't include . or _ and at least 3 letters and at maximum 20 letters",
    // ],
    validate: {
      errors: [],
      validator: function (username) {
        if (username.length < 10) {
          this.errors.push("username cannot be less than 3 characters");
        }
        if (username.match(/(?![_.])(?!.*[_.]{2})[a-zA-Z0-9._]+(?<![_.])$/)) {
          this.errors.push(`username shouldn't begin or end with . or _ `);
        }
      },
      message: this.errors,
    },
  },

Answer 1

在 validator 函数中创建一个 array 并将此数组 throw 作为 new Error()。然后在save()函数的回调中使用这个数组。

validate

validate: {
        validator: function (username) {
            let errors = []
            if (username.length < 3)
                errors.push("username cannot be less than 3 characters")

            if (username.match(/(?![_.])(?!.*[_.]{2})[a-zA-Z0-9._]+(?<![_.])$/))
                errors.push("username shouldn't begin or end with . or _ ")

            if (errors.length > 0)
                throw new Error(errors)
        }
    }

save

newUser.save((err, user) => {
    if (err) {
        let errors = Object.values(err.errors)[0].properties.message.split(',')
        return res.status(400).json({
            success: false,
            err: errors.length > 1 ? errors : errors[0]
        })
    }
    else ...
})

如何根据特定条件在猫鼬验证中创建错误数组？

how to create array of errors in mongoose validation based on certain conditions?

node.js

validation

mongoose