Module: HasSetting::ClassMethods

Defined in:
lib/has_setting/ar_extensions.rb

Instance Method Summary collapse

Instance Method Details

#has_setting(name, options = {}) ⇒ Object

Setup of the getter/setter

Raises:

  • (ArgumentError) 


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# File 'lib/has_setting/ar_extensions.rb', line 20

def has_setting(name, options = {})
  name = name.to_s
  raise ArgumentError.new('Setting name must not be blank') if name.blank?
  
  self.class_eval do
    unless @has_setting_options # define only once
      # AR association to settings
      has_many( :settings, :as => :owner, :class_name => 'HasSetting::Setting', 
                :foreign_key => :owner_id, :dependent => :destroy)
      after_save(:save_has_setting_association)
      @has_setting_options = {}
      def self.has_setting_options
        @has_setting_options
      end
      
      private
      # Callback to save settings
      def save_has_setting_association
        self.settings.each do |setting|
          setting.save if setting.changed?
        end
      end
    end
  end
  
  
  raise ArgumentError.new("Setting #{name }is already defined on #{self.name}") if self.has_setting_options.has_key?(name)
  
  # default options
  options[:type] ||= :string    # treat as string
    # default could be false, thats why we use has_key?
  options[:default] = options.has_key?(:default) ? options[:default] : nil # no default
  self.has_setting_options[name] = options
  
  # setter
  define_method("#{name}=".intern) do |value|
    formatter = HasSetting::Formatters.for_type(options[:type])
    write_setting(name, formatter.to_s(value))
  end
  
  # getter
  define_method(name) do |*args|
    setting = read_setting(name)
    options = args.first || self.class.has_setting_options[name]
    return options[:default] if setting.nil? 
    formatter = Formatters.for_type(options[:type])
    formatter.to_type(setting.value)
  end
end