```ruby
class ForestController < ApplicationController
  include Pundit

  protect_from_forgery with: :exception

  layout :layout_by_resource

  before_action :set_body_classes
  before_action :reset_class_method_cache

  private

    def layout_by_resource
      if devise_controller?
        'devise'
      else
        'application'
      end
    end

    def set_body_classes
      controller_heirarchy = self.class.name.split('::').reject(&:blank?)
      controller_heirarchy.pop
      controller_heirarchy = controller_heirarchy.collect { |a| "controller-class--#{a.underscore}" }.join(' ')

      classes = []
      classes << controller_heirarchy
      classes << "controller--#{controller_name}"
      classes << "action--#{action_name}"

      @body_classes = classes
    end

    def reset_class_method_cache
      Menu.reset_method_cache!
      Setting.reset_method_cache!
      Translation.reset_method_cache!
    end
end
```

Add ability to add additional body classes to body tag via host app
user
```ruby
class ForestController < ApplicationController
  include Pundit

  protect_from_forgery with: :exception

  layout :layout_by_resource

  before_action :set_body_classes
  before_action :reset_class_method_cache

  private

    def layout_by_resource
      if devise_controller?
        'devise'
      else
        'application'
      end
    end

    def set_body_classes
      controller_heirarchy = self.class.name.split('::').reject(&:blank?)
      controller_heirarchy.pop
      controller_heirarchy = controller_heirarchy.collect { |a| "controller-class--#{a.underscore}" }.join(' ')

      @body_classes ||= []
      @body_classes << controller_heirarchy
      @body_classes << "controller--#{controller_name}"
      @body_classes << "action--#{action_name}"
    end

    def reset_class_method_cache
      Menu.reset_method_cache!
      Setting.reset_method_cache!
      Translation.reset_method_cache!
    end
end
```
assistant