String validations

• required: can't be undefined (default: false)

• empty: accepts empty string (default: false)

• equal: * equal to passed value

• minLength: can't be shorter than passed value

• maxLength: can't be longer than passed value

• exactLength: length must be exactly the passed value

• regex: matches the passed regex

• alphanumeric: composed only by alphabetical and numeric characters

• lowerCase: all characters must be lower cased

• upperCase: all characters must be upper cased

• email: is a valid email (default: false)

• nullable: accepts null (default: false)

• guid: is a valid guid. You can pass a boolean or the options object accepted by Joi (default: false)

const User = attributes({
  id: {
    type: String,
    guid: true
  },
  token: {
    type: String,
    guid: {
      version: ['uuidv4']
    }
  },
  initials: {
    type: String,
    upperCase: true,
    maxLength: 4
  },
  gender: {
    type: String,
    nullable: true
  },
  password: String,
  passwordConfirmation: {
    type: String,
    equal: { attr: 'password' }
  },
  greet: {
    type: String,
    required: true,
    equal: ['Mr', 'Ms', 'Mrs', 'Miss', { attr: 'greetDesc' }]
  },
  greetDesc: String
})(class User {
  getFullGreet() {
    return `${this.greet} ${this.initials}`;
  }
});