code: function() {
      var args = this.store.utils.args(arguments)
      if (args.length > 1) {
        return this.validateFieldsHelper(args, this.validatesConfirmationOf)
      }
  
      var field = args[0]
      var confirmationField = field + '_confirmation'
  
      return this.validates(field, function() {
        var valid = this[field] === this[confirmationField]
        if (!valid) this.errors.add(field, 'confirmation error')
        return valid
      })
    }
docs: This validator checks if the given field`s value and <field_name>_confirmation are the same.
  @class Definition
  @method validatesConfirmationOf
  @param {array} fields - The fields to validate
  
  @return {Definition}