module BeforeRender
    extend ActiveSupport::Concern

    included do
        alias_method_chain :render, :before_render_action
        define_callbacks :render
    end

    def render_with_before_render_action(*options, &block)
        run_callbacks :render do
            render_without_before_render_action *options, &block
        end
    end

    module ClassMethods
        def append_before_render_action(*names, &block)
            _insert_callbacks(names, block) do |name, options|
                set_callback :render, :before, name, options
            end
        end

        def prepend_before_render_action(*names, &block)
            _insert_callbacks(names, block) do |name, options|
                set_callback :render, :before, name, options.merge(:prepend => true)
            end
        end

        def skip_before_render_action(*names, &block)
            _insert_callbacks(names, block) do |name, options|
                skip_callback :render, :before, name, options
            end
        end

        alias_method :before_render, :append_before_render_action
        alias_method :prepend_before_render, :prepend_before_render_action
        alias_method :skip_before_render, :skip_before_render_action
    end
end