Ruby-on-rails 加载常量时自动加载常量时检测到循环依赖
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Circular dependency detected while autoloading constant when loading constant
提问by tomr
First of all: I googled and used the search here and found answers to the same error but on different setups. Maybe I broke sth different ;)
首先：我在谷歌上搜索并使用了这里的搜索，找到了相同错误但在不同设置上的答案。也许我打破了某种不同;)
Error:
错误：
RuntimeError at /admin/users
Circular dependency detected while autoloading constant Admin::UsersController
The structure is:
结构是：
App => controllers => admin => users_controller.rb
Routes:
路线：
namespace :admin do
resources :stuff
resources :users
end
Users controller:
用户控制器：
class UsersController < Admin::BaseController
def new
#code
end
def create
#code
end
def index
#code
end
private
def user_params
#code
end
end
Admin base controller
管理基础控制器
class Admin::BaseController < ApplicationController
layout 'admin'
before_filter :require_login
end
Using: Rails 4.1.4, Ruby 2.1.2 What did I do wrong here?
使用：Rails 4.1.4、Ruby 2.1.2 我在这里做错了什么？
Thanks for your help!
谢谢你的帮助！
Edit:
编辑：
development.rb
发展.rb
Rails.application.configure do
config.cache_classes = false
config.eager_load = false
config.consider_all_requests_local = true
config.action_controller.perform_caching = false
config.action_mailer.raise_delivery_errors = false
config.active_support.deprecation = :log
config.active_record.migration_error = :page_load
config.assets.debug = true
config.assets.raise_runtime_errors = true
end
回答by pdobb
It looks like the primary issue may just be that you haven't namespaced your UsersController under the Adminnamespace, here:
看起来主要问题可能只是您没有在命名空间下为您的 UsersControllerAdmin命名，这里：
class UsersController < Admin::BaseController
Simple fix:
简单的修复：
class Admin::UsersController < Admin::BaseController
However, I suggest that you also break out your namespaces out into distinct parts to save future headache. So instead of the above, do this:
但是，我建议您也将命名空间分解为不同的部分，以节省将来的麻烦。因此，不要执行上述操作，而是执行以下操作：
# app/controllers/admin/users_controller.rb
module Admin
class UsersController < Admin::BaseController
# ...
end
end
And do the same with all other namespaced controllers, such as:
并对所有其他命名空间控制器执行相同操作，例如：
# app/controllers/admin/base_controller.rb
module Admin
class BaseController < ApplicationController
# ...
end
end
This way, as Rails is loading and autoloading and so forth it will always be sure to define the Admin module before attempting to load the classes under it. Sometimes you get unknown constant errors otherwise. The reasoning is a bit complex, but if you'd like to have a look check out this post.
这样，当 Rails 加载和自动加载等等时，它总是确保在尝试加载其下的类之前定义 Admin 模块。否则，有时您会遇到未知的常量错误。推理有点复杂，但如果你想看看这篇文章。
UPDATE
更新
On Rails Edge, there is now an official Guide on the topic of Auto Loading of Constants.
在 Rails Edge 上，现在有一个关于 Auto Loading of Constants 主题的官方指南。
