如何在 Rails 中正确设置、制造或包含关注

Question

通常，关注点位于

app/controllers/concerns.

但我想为管理方面提出和分离问题。

app/controllers/admin/concerns

鉴于我设置了一些示例代码，

# app/controllers/admin/concerns/test.rb
module Test
  extend ActiveSupport::Concern

  included do
    before_action :test
  end

  def test
    render json: 'test concern'
  end
end

# 还试过...,

module Admin
  module Test
    extend ActiveSupport::Concern

    included do
      before_action :test
    end

    def test
      render json: 'test concern'
    end
  end
end

#然后include like，include Admin::Test

如何在我的管理控制器中正确调用或包含测试问题。

class Admin::ShopsController < Admin::BaseController
   include Admin::Test # doing this,
   # got uninitialized constant Admin::Test
end

Answer 1

官方指南中有相关说明

All right, Rails has a collection of directories similar to $LOAD_PATH in which to look up post.rb. That collection is called autoload_paths and by default it contains:

Any existing second level directories called app/*/concerns in the application and engines.

https://guides.rubyonrails.org/autoloading_and_reloading_constants.html

未加载app/controllers/admin/concerns的原因是它不是二级目录。

由于二级目录中的文件是自动加载的，在这种情况下，您应该将 test.rb 文件放在 app/controllers/concerns/admin.

或将 app/controllers/admin/concerns 添加到自动加载路径，但不强烈推荐，因为这不符合 rails 设计模式。