Module: ActsAsArray::ClassMethods

Defined in:
lib/acts_as_array.rb

Instance Method Summary collapse

Instance Method Details

#acts_as_array(params = {}) ⇒ Object

acts_as_array :has_many_field => => Class, :field => :name



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# File 'lib/acts_as_array.rb', line 10

def acts_as_array(params = {})
  params.each do |field, opts|
    opts[:class] ||= field.to_s.singularize.capitalize.constantize
  end
  self.class_eval do
    params.each do |field, opts|
      # Setter with an array mapper
      #
      # Example:
      #
      # mails = ['[email protected]', '[email protected]']
      #
      # instead of
      # 
      # mails = [Mail.new(name: '[email protected]'), Mail.new(name: '[email protected]')]
      unless method_defined?("#{field}_with_arraymap=")
        define_method("#{field}_with_arraymap=") do |raw_array|
          obj_array = __send__("make_#{field}", raw_array)
          __send__("#{field}_without_arraymap=", obj_array)
        end
        define_method("#{field}=") {|*args| } unless method_defined?("#{field}=")
        alias_method("#{field}_without_arraymap=", "#{field}=")
        alias_method("#{field}=", "#{field}_with_arraymap=")
      end

      # Getter with an array mapper
      #
      # Example:
      #
      # mails #=> ['[email protected]', '[email protected]']
      #
      # instead of
      #
      # mails #=> [Mail.new(name: '[email protected]'), Mail.new(name: '[email protected]')]
      unless method_defined?("#{field}_with_arraymap")
        define_method("#{field}_with_arraymap") do
          obj_array = __send__("#{field}_without_arraymap")
          obj_array.map {|obj| obj.__send__(opts[:field]) }
        end
        define_method("#{field}") { } unless method_defined?("#{field}")
        alias_method("#{field}_without_arraymap", "#{field}")
        alias_method("#{field}", "#{field}_with_arraymap")
      end

      # Get the original object array
      #
      # Example:
      #
      # obj_mails #=> [Mail.new(name: '[email protected]'), Mail.new(name: '[email protected]')]
      define_method("obj_#{field}") do
        __send__("#{field}_without_arraymap")
      end

      # Convert the single value array to object array
      #
      # Example:
      #
      # make_mails(['[email protected]', '[email protected]'])
      # #=> [Mail.new(name: '[email protected]'), Mail.new(name: '[email protected]')]
      #
      # Note:
      #
      # This method uses the `#find_or_initialize_by` method internally
      define_method("make_#{field}") do |raw_array|
        return nil unless raw_array
        raw_array.map {|val| opts[:class].find_or_initialize_by(opts[:field] => val) }
      end
    end
  end
end