ruby-on-rails – 为什么Rails 4.2响应者不断告诉我向Gemfile添加响应者？

我正在将Rails 4.1.8应用程序(也使用Rails-api~> 0.3.1)升级到4.2.0.rc2,并希望保留respond_with功能.我已经在Gemfile中添加了响应器,但是当我bin / rake规范时,我得到：

/Users/sloveless/.gem/ruby/2.1.0/gems/actionpack-4.2.0.rc2/lib/action_controller/metal/mime_responds.rb:10:in `respond_to': The controller-level `respond_to' feature has been extracted to the `responders` gem. Add it to your Gemfile to conTinue using this feature: (NoMethodError)
  gem 'responders','~> 2.0'
Consult the Rails upgrade guide for details.
    from /Users/sloveless/Development/twilight/app/controllers/application_controller.rb:6:in `<class:ApplicationController>'
    from /Users/sloveless/Development/twilight/app/controllers/application_controller.rb:1:in `<top (required)>'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:274:in `require'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:274:in `block in require'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:240:in `load_dependency'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:274:in `require'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:360:in `require_or_load'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:494:in `load_missing_constant'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:184:in `const_missing'
    from /Users/sloveless/Development/twilight/app/controllers/zone_maps_controller.rb:1:in `<top (required)>'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:274:in `require'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:274:in `block in require'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:240:in `load_dependency'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:274:in `require'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:360:in `require_or_load'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:494:in `load_missing_constant'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:184:in `const_missing'
    from /Users/sloveless/Development/twilight/spec/controllers/zone_maps_controller_spec.rb:3:in `<top (required)>'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:268:in `load'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:268:in `block in load'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:240:in `load_dependency'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:268:in `load'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/rspec-core-3.1.7/lib/rspec/core/configuration.rb:1105:in `block in load_spec_files'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/rspec-core-3.1.7/lib/rspec/core/configuration.rb:1105:in `each'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/rspec-core-3.1.7/lib/rspec/core/configuration.rb:1105:in `load_spec_files'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/rspec-core-3.1.7/lib/rspec/core/runner.rb:96:in `setup'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/rspec-core-3.1.7/lib/rspec/core/runner.rb:84:in `run'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/rspec-core-3.1.7/lib/rspec/core/runner.rb:69:in `run'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/rspec-core-3.1.7/lib/rspec/core/runner.rb:37:in `invoke'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/rspec-core-3.1.7/exe/rspec:4:in `<top (required)>'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:268:in `load'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:268:in `block in load'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:240:in `load_dependency'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/activesupport-4.2.0.rc2/lib/active_support/dependencies.rb:268:in `load'
    from /Users/sloveless/.gem/ruby/2.1.0/gems/spring-commands-rspec-1.0.3/lib/spring/commands/rspec.rb:18:in `call'
    from /Users/sloveless/.rubies/ruby-2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /Users/sloveless/.rubies/ruby-2.1.0/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from -e:1:in `<main>'

任何想法,为什么我可能会得到这个？ ……当然,我怎么能绕过它呢？

相关文件：

# app/application_controller.rb
class ApplicationController < ActionController::API
  include ActionController::MimeResponds
  include ActionController::ImplicitRender
  include SentientController

  respond_to :json

  # (Custom responder)
  self.responder = httpErrors::responder
  before_action :set_locale

  private

  def set_locale
    I18n.locale = http_accept_language.compatible_language_from(I18n.available_locales)
  end
end






# Gemfile
source 'https://rubygems.org'

gem 'rails','4.2.0.rc2'
gem 'rails-api','~> 0.3.1'

# Other utils
gem 'uuidtools'

# serializing things
gem 'active_model_serializers','~> 0.8.2'

# PersisTing things
gem 'pg','~> 0.17.1'
# gem 'activerecord-Postgis-adapter','~> 2.2.1'
# gem 'redis'

# Controller & routIng things
gem 'http_accept_language','~> 2.0.2'
gem 'kaminari'
gem 'rack-cors',require: 'rack/cors'
gem 'responders','~> 2.0'

group :development do
  gem 'brakeman',require: false
  gem 'guard-bundler'
  gem 'guard-rails'
  gem 'guard-rspec'
  gem 'guard-rubocop'
  gem 'rails_best_practices'
  gem 'rubocop',require: false
  gem 'quiet_assets'
  gem 'web-console','~> 2.0'
end

group :development,:test do
  gem 'bullet'
  gem 'byebug'
  gem 'factory_girl_rails'
  gem 'faker'
  gem 'pry-rails'
  gem 'pry-rescue'
  gem 'pry-stack_explorer'
  gem 'rspec-rails'
  gem 'puma'
  gem 'spring'
  gem 'spring-commands-rspec'
end

group :test do
  gem 'json_spec'
  gem 'shoulda-matchers'
end

group :production do
  gem 'newrelic_rpm'
end

编辑：毫不奇怪,这种情况发生在我手动发出请求时,而不仅仅是在测试期间.

include ActionController::MimeResponds
include ActionController::ImplicitRender

include ActionController::respondWith