Initializer for handling ActiveRecord (4.1+) enums by RailsAdmin (0.6.2)

active_record_enum_with_rails_admin.rb

module ActiveRecord
  module RailsAdminEnum
    def enum(definitions)
      super

      definitions.each do |name, values|
        define_method("#{ name }_enum") { self.class.send(name.to_s.pluralize).to_a }

        define_method("#{ name }=") do |value|
          if value.kind_of?(String) and value.to_i.to_s == value
            super value.to_i
          else
            super value
          end
        end
      end
    end
  end
end

ActiveRecord::Base.send(:extend, ActiveRecord::RailsAdminEnum)

Also had the issue with form value not populated with stored value. (and fix from @jefflab broke the filtering for me)
I was able to fix it with adding mentioned initializer + :

          configure :state, :enum do
            def form_value
              bindings[:object].state_before_type_cast
            end
          end