Object#chain

named_scopes.rb

# sort by price after sort by date if active projects listed
collection.sort_by_date_asc.chain(|c| c.active.sort_by_price_asc if params[:active]).sort_by_customer_name_desc

object_ext.rb

class Object
    # obj.chain{|x|...}    => obj or block result
    #
    #
    #     Yields <code>x</code> to the block, and then returns <code>x</code>.
    #     The primary purpose of this method is to 'tap into' method chain
    #     in order to modify object or return another object
    #
    #     obj = 100
    #     obj.chain{|object| object.is_a?(Array) ? object : [object] } => [100]
    #     obj.chain{|object| [object] unless object.is_a?(Array) } => [100]
    #     obj.chain => 100
    #
  def chain
    return self unless block_given?
    yield(self) || self
  end
end