Using simple_enum with Mongoid

Adding an enum field to a Mongoid document using simple_enum requires an additional step and a slightly adopted as_enum method which works with mongoid.

1. Load mongoid support in an initalizer:

   require 'simple_enum/mongoid'
   # NOTE TO SELF: use autoload in simple_enum, so we can skip this
   # step in the future...
   

2. Include Mongoid module and add as_enum to your document, a field named gender_cd is added automatically by simple_enum:

   class User
     include Mongoid::Document
     include SimpleEnum::Mongoid
   
     as_enum :gender, :female => 1, :male => 0
   end
   

3. Wohooo, done!

   user = User.new(:gender => 'male')
   user.male?     # => true