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module AbstractController
module Helpers
extend ActiveSupport::Concern
include RenderingController
def self.next_serial
@helper_serial ||= 0
@helper_serial += 1
end
included do
extlib_inheritable_accessor(:_helpers) { Module.new }
extlib_inheritable_accessor(:_helper_serial) do
AbstractController::Helpers.next_serial
end
end
module ClassMethods
# When a class is inherited, wrap its helper module in a new module.
# This ensures that the parent class's module can be changed
# independently of the child class's.
def inherited(klass)
helpers = _helpers
klass._helpers = Module.new { include helpers }
super
end
# Declare a controller method as a helper. For example, the following
# makes the +current_user+ controller method available to the view:
# class ApplicationController < ActionController::Base
# helper_method :current_user, :logged_in?
#
# def current_user
# @current_user ||= User.find_by_id(session[:user])
# end
#
# def logged_in?
# current_user != nil
# end
# end
#
# In a view:
# <% if logged_in? -%>Welcome, <%= current_user.name %><% end -%>
#
# ==== Parameters
# meths<Array[#to_s]>:: The name of a method on the controller
# to be made available on the view.
def helper_method(*meths)
meths.flatten.each do |meth|
_helpers.class_eval <<-ruby_eval, __FILE__, __LINE__ + 1
def #{meth}(*args, &blk)
controller.send(%(#{meth}), *args, &blk)
end
ruby_eval
end
end
# Make a number of helper modules part of this class' default
# helpers.
#
# ==== Parameters
# *args<Array[Module]>:: Modules to be included
# block<Block>:: Evalulate the block in the context
# of the helper module. Any methods defined in the block
# will be helpers.
def helper(*args, &block)
self._helper_serial = AbstractController::Helpers.next_serial + 1
args.flatten.each do |arg|
case arg
when Module
add_template_helper(arg)
end
end
_helpers.module_eval(&block) if block_given?
end
private
# Makes all the (instance) methods in the helper module available to templates
# rendered through this controller.
#
# ==== Parameters
# mod<Module>:: The module to include into the current helper module
# for the class
def add_template_helper(mod)
_helpers.module_eval { include mod }
end
end
end
end
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