How can I validate an array of values within a given set? about hash_validator HOT 2 CLOSED

class HashValidator::Validator::WhitelistValidator < HashValidator::Validator::Base
  def initialize(attribute, whitelist)
    super(attribute)
    @whitelist = whitelist
  end

  def validate(key, value, validations, errors)
    unless value.is_a?(Array) && (value - @whitelist).empty?
      errors[key] = "value must be whitelisted"
    end
  end
end

# Add the validator
events_validator = HashValidator::Validator::WhitelistValidator.new('events', ['foo', 'bar', 'baz'])
HashValidator.append_validator(events_validator)



# Simple case
validator = HashValidator.validate({ events: ['foo'] }, { events: 'events' })
validator.valid?  # => true
validator.errors  # => {}

# Complex success
validator = HashValidator.validate({ events: ['foo', 'bar', 'baz'] }, { events: 'events' })
validator.valid?  # => true
validator.errors  # => {}

# Complex failure
validator = HashValidator.validate({ events: ['foo', 'bar', 'florp'] }, { events: 'events' })
puts validator.valid?  # => false
puts validator.errors  # => {events: "value must be whitelisted"}