Object.const_get and Rails - cutting off parent module names

Question

I have the following code to pull out and instantiate Rails controllers:

def get_controller(route)
  name = route.requirements[:controller]
  return if name.nil?         


        

Answer 1

This was solved by an answer from user apneadiving which can be found here

Be aware that there are vicious cases in Rails development mode. In order to gain speed, the strict minimum is loaded. Then Rails looks for classes definitions when needed.

But this sometimes fails big time example, when you have say ::User already loaded, and then look for ::Admin::User. Rails would not look for it, it will think ::User does the trick.

This can be solved using require_dependency statements in your code.

Personally I think this is a bug, not a feature, but...so it goes. It solves the problem.

Answer 2

First of all, this code is superfluous:

if name.match(/\//)
  controller_name = name.split('/').map(&:camelize).join('::')
else
  controller_name = name.camelize
end

The only string would perfectly handle both cases:

controller_name = name.split('/').map(&:camelize).join('::')

Then, you probably want to handle namespaces properly:

n_k = controller_name.split('::')
klazz = n_k.last

namespace_object = if n_k.length == 1
                     Object
                   else
                     Kernel.const_get(n_k[0..-2].join('::'))
                   end

controller = namespace_object.const_get("#{klazz}Controller")

Hope that helps.