ObjectEnum

Java-like Enum can be defined by include this module.
A good solution to simplify category logic.

Installation

Add this line to your application's Gemfile:

gem 'object_enum'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install object_enum

Usage

For example, an Enum with a simple single value can be written as:

class Role
  include ObjectEnum
  attr_reader :name
  def initialize(name)
    @name = name
  end

  CUSTOMER = new("customer")
  ADMIN    = new("admin")
end

# Find by name
Role.find(name: "customer") == Role::CUSTOMER

If you want to switch implement on the role, you can keep your code simple by splitting the value into another class.

class RoleBase
  def label
    raise "Not implemented!!!"
  end
end

class Customer < RoleBase
  def label
    "customer"
  end
end

class Admin < RoleBase
  def label
    "admin"
  end
end

class Role
  include ObjectEnum

  CUSTOMER = Customer.new
  ADMIN = Admin.new

  # Override enum_class method.     
  def self.enum_class
    RoleBase
  end
end

Role::ADMIN.label == "admin"

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/orekyuu/object_enum.

License

The gem is available as open source under the terms of the MIT License.