Rails 4.2.0.rc1 升级 <module:InheritedResources>': 未初始化常量 ActionController::Responder (NameError)答案

【问题标题】：Rails 4.2.0.rc1 upgrade <module:InheritedResources>': uninitialized constant ActionController::Responder (NameError)Rails 4.2.0.rc1 升级 <module:InheritedResources>': 未初始化常量 ActionController::Responder (NameError)
【发布时间】：2015-02-01 05:27:23
【问题描述】：

在我尝试从 4.1.8 升级到 rails 4.2.0.rc1 时，运行服务器时出现以下错误：

joshRpowell@Joshuas-MacBook-Air:~/MyProjects/rentlit-app[hook]$ rails s
/Users/joshRpowell/.rvm/gems/ruby-2.1.5@rails4.2/gems/inherited_resources-1.5.1/lib/inherited_resources/responder.rb:2:in `<module:InheritedResources>': uninitialized constant ActionController::Responder (NameError)
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@rails4.2/gems/inherited_resources-1.5.1/lib/inherited_resources/responder.rb:1:in `<top (required)>'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@rails4.2/gems/inherited_resources-1.5.1/lib/inherited_resources.rb:4:in `<top (required)>'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@rails4.2/bundler/gems/active_admin-951f35d6799a/lib/active_admin.rb:10:in `<top (required)>'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@rails4.2/bundler/gems/active_admin-951f35d6799a/lib/activeadmin.rb:1:in `require'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@rails4.2/bundler/gems/active_admin-951f35d6799a/lib/activeadmin.rb:1:in `<top (required)>'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@global/gems/bundler-1.7.7/lib/bundler/runtime.rb:76:in `require'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@global/gems/bundler-1.7.7/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@global/gems/bundler-1.7.7/lib/bundler/runtime.rb:72:in `each'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@global/gems/bundler-1.7.7/lib/bundler/runtime.rb:72:in `block in require'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@global/gems/bundler-1.7.7/lib/bundler/runtime.rb:61:in `each'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@global/gems/bundler-1.7.7/lib/bundler/runtime.rb:61:in `require'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@global/gems/bundler-1.7.7/lib/bundler.rb:133:in `require'
from /Users/joshRpowell/MyProjects/rentlit-app/config/application.rb:7:in `<top (required)>'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@rails4.2/gems/railties-4.2.0.rc1/lib/rails/commands/commands_tasks.rb:78:in `require'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@rails4.2/gems/railties-4.2.0.rc1/lib/rails/commands/commands_tasks.rb:78:in `block in server'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@rails4.2/gems/railties-4.2.0.rc1/lib/rails/commands/commands_tasks.rb:75:in `tap'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@rails4.2/gems/railties-4.2.0.rc1/lib/rails/commands/commands_tasks.rb:75:in `server'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@rails4.2/gems/railties-4.2.0.rc1/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /Users/joshRpowell/.rvm/gems/ruby-2.1.5@rails4.2/gems/railties-4.2.0.rc1/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'

在我的 application.rb 文件中，我有以下内容：

require File.expand_path('../boot', __FILE__)

require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(:default, Rails.env)

module Rentlit
  class Application < Rails::Application

    config.generators.helper = false
    config.generators.assets = false
    config.generators.view_specs = false
  end
end

有关如何排除故障的任何建议？

【问题讨论】：

标签： ruby-on-rails activeadmin upgrade ruby-on-rails-4.2

【解决方案1】：

他们已经解决了：https://github.com/josevalim/inherited_resources/commit/6d034d913bfd9b53ea2e5b31c4056578a1b170a4。我正在使用带有 rails 4.2.1 的最新 gem 版本，它工作正常。

对于遇到此问题的任何人，请尝试bundle update inherited_resources。

旧答案：

您必须使用 rails 4.2 的特定分支：

gem 'inherited_resources', github: 'josevalim/inherited_resources', branch: 'rails-4-2'

【讨论】：

注意：在我的 GEMFILE 中，我必须在 activeadmin 之前包含inherited_resources。

【解决方案2】：

至于现在，只需运行

bundle update inherited_resources

【讨论】：

【解决方案3】：

我不完全确定，但我知道 action_controller/metal/responder.rb 在 4.2 中已从 rails 中删除，并且几乎直接复制到了 responders gem 的 action_controller/responder.rb。您可以尝试将gem 'responders', '~> 2.0' 添加到您的 Gemfile 中，看看是否可以解决问题。

FWIW：

响应者 2.x：responders/lib/action_controller/responder.rb
来自 Rails 4.1.8：rails/actionpack/lib/action_controller/metal/responder.rb
Rails 4.2.2.rc2 中的metal/ 目录：rails/actionpack/lib/action_controller/metal/（注意没有更多的responders.rb。

【讨论】：