Get all controllers and actions in Merb

When I was implementing our home-grown authorization system, I have to know what controllers are available, for the given controller, what actions are available. This shouldn't difficult using reflection within Ruby. But after reading the source code of Merb, I found it is dead simple to get what you want:

- Application.subclasses_list
- YourController.callable_actions

Here is the code in my Role modle:

	...
	def self.available_controllers(name)
	roles = Role.all(:name => name, :authorizable_type.not => nil)
	exists_controllers = roles.collect{|r| r.authorizable_type}
	controllers = Application.subclasses_list.to_a.sort
	controllers - exists_controllers
	end
	def authorizable_class
	return nil if authorizable_type.nil?
	klass = begin
	authorizable_type.split("::").inject(Object){|x, y| x.const_get(y)}
	rescue NameError => e
	msg = "Class not found: `#{authorizable_type}'"
	Merb.logger.warn!(msg)
	nil
	end
	end
	...
	def callable_actions
	klass = authorizable_class
	# make sure is a controller
	return [] if klass.nil? || !klass.respond_to?(:callable_actions)
	# get the supper class's actions out your way
	actions = klass.callable_actions.keys - klass.superclass.callable_actions.keys
	actions.sort
	end

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