Fluent Validation in Ruby

gem 'fluent_validation'

class Member
  attr_accessor :name, :email, :type
end

require 'fluent_validation/fluent_validator'
class MemberValidator < FluentValidation::FluentValidator
  def initialize
    super

    rule_for(&->(member) { member.name })
      .not_nil
      .length(1, 20)
      .with_name('Name')

    rule_for(&->(member) { member.email })
      .not_nil
      .length(1, 100)
      .email_address
      .with_name('Email Address')

    rule_for(&->(member) { member.type })
      .not_nil
      .must(&->(type) { type == 'vip'||type == 'platinum' })
      .with_name('Member Type')
  end
end

member = Member.new
member_validator = MemberValidator.new
validation_result = member_validator.validate(member)