Module: EZEnum

Defined in:
lib/ez_enum.rb,
lib/ez_enum/version.rb

Constant Summary collapse

VERSION = 
"0.0.1"

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/ez_enum.rb', line 8

def included(base)

  const_names = base.constants(false)

  const_names_by_value = const_names.inject({}) do |list, name|
    list[base.const_get(name)] = name
    list
  end

  # add an "All" constant
  base.const_set :All, const_names_by_value.keys

  # add helper methods to module
  base.class_eval do

    # provides an array of display and values pairs
    # typcially for use in HTML select controls
    define_singleton_method :choices_for_select do
      const_names_by_value.collect do |value, name|
        [translate_display_for(name), value]
      end
    end

    # resolves for the display name for the given value
    define_singleton_method :display_for do |value|
      translate_display_for(const_names_by_value[value])
    end

    private

    # lookup i18n translation for given name
    define_singleton_method :translate_display_for do |const_name|
      I18n.translate(
        const_name.to_s.underscore.to_sym,
        :scope => [:enums, base.name.underscore],
        :default => const_name.to_s
      )
    end

  end
end