Object.const_get and Rails - cutting off parent module names - ruby-on-rails

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?
if name.match(/\//)
controller_name = name.split('/').map(&:camelize).join('::')
else
controller_name = name.camelize
end
p controller_name: controller_name
controller = Object.const_get("#{controller_name}Controller")
p controller: controller
controller.new
end
some routes are single names - "users", "friends", "neighbors", "politicians", etc...
other routes are nested, such as "admin/pets", "admin/shopping_lists", "admin/users", etc...
The above code works (in that it properly builds and instantiates the controller) in most of the cases mentioned, except for one - in this example, "admin/users"
from the puts statements, I'm getting the following:
{:controller_name=>"Admin::Users"}
{:controller => UsersController}
You'll notice that the namespace Admin is getting cut off. My guess is that since this is only the case for controllers which share a name in multiple namespaces (users and admin/users), it has something do to with Rails autoloading (?). Any idea about what is causing this?
As per the comment from lx00st, I should also point out that I've tried various forms of getting these constants, another attempt was as follows:
sections = name.split('/')
sections.map(&:camelize).inject(Object) do |obj, const|
const += "Controller" if const == sections.last
obj.const_get(const)
end
The same problem was encountered with this approach.

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.