Ehon

Ehon is a simple enum library.

Installation

Add this line to your application's Gemfile:

gem 'ehon'

And then execute:

$ bundle

Or install it yourself as:

$ gem install ehon

Usage

You can create your enum class easily.

class DeviceType
  include Ehon

  default user_agent_regexp: //

  UNKNOWN = enum 0, name: 'unknown'
  IOS     = enum 1, name: 'iOS',     user_agent_regexp: /(iPhone|iPad|iPod)/
  ANDROID = enum 2, name: 'Android', user_agent_regexp: /Android/
end

Using DeviceType class.

DeviceType::IOS.id #=> 1
DeviceType::ANDROID.user_agent_regexp #=> /Android/

Finding.

You can find your item from enum class with following 2 way.

DeviceType[1, 2] #=> [#<DeviceType:...(iOS)>, #<DeviceType:...(Android)>]
DeviceType.find(name: 'iOS') #=> #<DeviceType:...(iOS)>

and you also list all items using #all method

DeviceType.all #=> [iOS, Android, unknown]

Custom methods.

You can define any method for your enum class.

class DeviceType
  def ios?
    self.name == "iOS"
  end

  def android?
    self.name == "Android"
  end

  def unknown?
    self.name == "unknown"
  end

  def valid_user_agent?(user_agent)
    !!(self.user_agent_regexp =~ user_agent)
  end
end

DeviceType::IOS.ios? #=> true
DeviceType::IOS.android? #=> false

user_agent = 'Mozilla/5.0 (Linux; Android 4.4.4; KYV33 Build/xxxx)'
DeviceType::ANDROID.valid_user_agent?(user_agent) #=> true

Contributing

Fork it ( http://github.com/hekk/ehon/fork )
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create new Pull Request