Module: ConstEnum::ActiveRecord::ClassMethods

Defined in:
lib/const_enum/active_record.rb

Instance Method Summary collapse

Instance Method Details

#const(clazz_name, options = {}, &block) ⇒ Object

定数クラス、定数ラベルアクセサ、named_scope、predicate methodを作成します

arguments

mod_name: 定義されるクラスの名前です options: 

:scope         named_scopeを定義します。default: true
:predicate     属性値の検証メソッドを定義します。default: true
:prefix        scope, predicate を作成する際のprefixを指定します。default: "#{mod_name.downcase}_"
:i18n          ラベル名にi18nを利用しない

extensions: ブロック内でメソッド定義を行うことで、定数オブジェクトに対してメソッドを定義することが出来ます。

exapmle

class Hoge < ActiveRecord::Base
  const :STATUS do
    ENABLE    1, '有効'
    DISABLE   0, '無効'
    def code
      '%05d'%value
    end
  end
end

Hoge::STATUS::ENABLE # 1 Hoge::STATUS.ENABLE.value # 1 Hoge::STATUS.ENABLE.label # “有効” Hoge::STATUS.ENABLE.code # 00001 Hoge.crate(:name => ‘有効なHOGE’, :status => Hoge::STATUS::ENABLE) Hoge.crate(:name => ‘無効なHOGE’, :status => Hoge::STATUS::DISABLE) enable_hoge = Hoge.status_enable.first enable_hoge.name # “有効なHOGE” enable_hoge.status_label # “有効” newhoge = Hoge.new(:name => ‘新しいHOGE’, :status => Hoge::STATUS::ENABLE) newhoge.status_enable? # true newhoge.status_disable? # false form_for newhoge do |f|

f.collection_select(:status, Hoge::STATUS, :value, :label)
f.collection_select(:status, Hoge::STATUS, :value, :code)

end



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# File 'lib/const_enum/active_record.rb', line 52

def const(clazz_name, options = {}, &block)
  clazz_name = clazz_name.to_s
  default = {:label_suffix => ConstEnum::ActiveRecord.label_suffix,:scope => true, :predicate => true, :attr=>clazz_name.downcase, :prefix => "#{clazz_name.downcase}_", :validation => false, :allow_blank => true, :i18n => true}
  options = default.merge(options.symbolize_keys)
  attr = options[:attr]
  if ConstEnum::ActiveRecord.i18n and options[:i18n]
    clazz = const_enum do
      include ConstEnum::WithI18n
      class_eval(&block)
    end
    clazz.i18n_options.merge!(ConstEnum::ActiveRecord.i18n) if Hash === ConstEnum::ActiveRecord.i18n
    clazz.i18n_options[:key] = [clazz.i18n_options[:key], self.name.underscore, attr].join('.')
    clazz.i18n_options.merge!(options[:i18n]) if Hash === options[:i18n]
  else
    clazz = const_enum(&block)
  end
  
  const_set(clazz_name, clazz)
  if options[:label_suffix]
    class_eval <<-"EOS", __FILE__, __LINE__
      def #{attr}#{options[:label_suffix]}
        #{clazz_name}[#{attr}].try(:label)
      end
      def #{attr}#{options[:label_suffix]}_was
        #{clazz_name}[#{attr}_was].try(:label)
      end
    EOS
  end
  if options[:scope]
    clazz.each do |obj|
      key =  clazz.key(obj.value).to_s
      class_eval <<-"EOS", __FILE__, __LINE__
        scope :#{options[:prefix]}#{key.downcase}, lambda { where('#{attr}' => #{clazz_name}::#{key}) }
      EOS
    end
  end
  if options[:predicate]
    clazz.each do |obj|
      key = clazz.key(obj.value).to_s
      class_eval <<-"EOS", __FILE__, __LINE__
        def #{options[:prefix]}#{key.downcase}?
          #{attr} == #{clazz_name}::#{key}
        end
        def was_#{options[:prefix]}#{key.downcase}?
          #{attr}_was == #{clazz_name}::#{key}
        end
      EOS
    end
  end
  if options[:validation]
    validates attr.to_sym, :inclusion => {:in => clazz}, :allow_blank => (!!options[:allow_blank])
  end
  clazz
end