Module: Positionable::Extension::ClassMethods

Defined in:
lib/activerecord-positionable/extension.rb

Instance Method Summary collapse

Instance Method Details

#position_attr(*attr_names) ⇒ Object 



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# File 'lib/activerecord-positionable/extension.rb', line 28

def position_attr(*attr_names)
  attr_names.each do |attr_name|
    after_save :"assign_#{attr_name}!", if: :"#{attr_name}_missing?"

    class_eval <<-BODY, __FILE__, __LINE__ + 1
      def #{attr_name}_missing?
        self[:#{attr_name}].blank?
      end

      def assign_#{attr_name}!
        self[:#{attr_name}] = id
        save!
      end
    BODY
  end
  self.attributes_marked_as_position += attr_names
end

#positionable(attr_name = :position) ⇒ Object 



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# File 'lib/activerecord-positionable/extension.rb', line 16

def positionable(attr_name = :position)
  position_attr(attr_name)

  scope :ordered, -> { order(Hash[attr_name, :desc]).order(id: :desc) }
  scope :latest,  -> { ordered }

  self.positionable_options = positionable_options.deep_dup.merge!(
    attribute: attr_name,
    scope: :ordered
  )
end