ruby-on-rails - Rails 4 + append_view_path

Question

我想在 Rails gem 的 Controller 中使用动态路径。

我已经添加到

module MyGem
  class FooController < Config.controller
    before_action ->{ append_view_path "app/views/my_gem/#{wizard_name}" }
...

在 View 中我需要指定像

这样的路径

app/views/my_gem/#{wizard_name}/my_gem/foo/some.erb

在 Rails 中以某种方式切割 gem 命名空间的相对路径，并获得类似的查找路径？

app/views/my_gem/#{wizard_name}/some.erb
# or
foo/bar/some.erb

谢谢!

更新:

我知道，在 Engine 中禁用 isolate_namespace 是有办法的，但我相信，这不是最好的，也是唯一的选择。

UPD2:对于 Rails4，这个想法非常有用 https://coderwall.com/p/p_yelg/render-view-outside-of-a-controller-in-rails-4

Answer 1

Devise gem 有一种通过覆盖 _prefixes 方法来添加 View 查找路径的方法:

class DeviseController < Devise.parent_controller.constantize
  include Devise::Controllers::ScopedViews

  # Override prefixes to consider the scoped view.
  # Notice we need to check for the request due to a bug in
  # Action Controller tests that forces _prefixes to be
  # loaded before even having a request object.
  #
  # This method should be public as it is is in ActionPack
  # itself. Changing its visibility may break other gems.
  def _prefixes #:nodoc:
    @_prefixes ||= if self.class.scoped_views? && request && devise_mapping
      ["#{devise_mapping.scoped_path}/#{controller_name}"] + super
    else
      super
    end
  end

end

这可以应用于您的用例吗？

查看来源:
https://github.com/plataformatec/devise/blob/master/app/controllers/devise_controller.rb