Rails core - Jan 2014 - Let scaffold controller generators generate namespaced controllers for non-namespaced models

A common scenario is wanted to generate scaffold controllers within an 
admin namespace.

When attempting to do this with the standard scaffold_controller generator, 
it assumes you are doing it for a namespaced model as well. Therefore, out 
of the box many of the generated code doesn't work.

Lets say you run rails g scaffold_controller admin/users, for an existing 
model User that is not within a namespace.

The resulting controller has the namespace correctly, but the model is 
namespaced too (not the desirable result):

  class Admin::UsersController < ApplicationController
    # code omited for demo purposes
    def create
      @admin_user = Admin::User.new(admin_user_params)

      respond_to do |format|
        if @admin_user.save
          format.html { redirect_to @admin_user, notice: 'User was
successfully created.' }
          format.json { render action: 'show', status: :created,
location: @admin_user }
        else
          format.html { render action: 'new' }
          format.json { render json: @admin_user.errors, status:
:unprocessable_entity }
        end
      end
    end
  end

There are multiple problems here - there is no model such as Admin::User, 
and furthermore redirect_to @admin_user would never work - the correct 
thing to do here would be:
redirect to admin_user_path(@admin_user)

We should be able to generate a namespaced controller with a different 
namespace for the model.

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