Methods
A
Instance Public methods
add_resource_route()

Properly nests namespaces passed into a generator

$ rails generate resource admin/users/products

should give you

namespace :admin do
  namespace :users
    resources :products
  end
end

Source: show | on GitHub 

# File railties/lib/rails/generators/rails/resource_route/resource_route_generator.rb, line 16
def add_resource_route
  return if options[:actions].present?

  # iterates over all namespaces and opens up blocks
  regular_class_path.each_with_index do |namespace, index|
    write("namespace :#{namespace} do", index + 1)
  end

  # inserts the primary resource
  write("resources :#{file_name.pluralize}", route_length + 1)

  # ends blocks
  regular_class_path.each_index do |index|
    write("end", route_length - index)
  end

  # route prepends two spaces onto the front of the string that is passed, this corrects that
  route route_string[2..-1]
end