Devise 使我的 rails 应用程序在 heroku 上崩溃，"undefined local variable or method `mimes_for_respond_to'"
Devise crashes my rails app on heroku, "undefined local variable or method `mimes_for_respond_to'"
自从添加设计 gem 后，heroku 无法在生产环境中加载我的应用程序，出现应用程序错误：
An error occurred in the application and your page could not be served. Please try again in a few moments.
If you are the application owner, check your logs for details.
控制台的具体错误日志是
/app/vendor/bundle/ruby/2.1.0/gems/devise-3.3.0/app/controllers/devise_controller.rb:13:in `<class:DeviseController>': undefined local variable or method `mimes_for_respond_to' for DeviseController:Class (NameError)
from /app/vendor/bundle/ruby/2.1.0/gems/devise-3.3.0/app/controllers/devise_controller.rb:2:in `<top (required)>'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `block in require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:240:in `load_dependency'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:360:in `require_or_load'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:494:in `load_missing_constant'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:184:in `const_missing'
from /app/vendor/bundle/ruby/2.1.0/gems/devise-3.3.0/app/controllers/devise/confirmations_controller.rb:1:in `<top (required)>'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `block in require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:240:in `load_dependency'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:360:in `require_or_load'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:317:in `depend_on'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:233:in `require_dependency'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/engine.rb:472:in `block (2 levels) in eager_load!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/engine.rb:471:in `each'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/engine.rb:471:in `block in eager_load!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/engine.rb:469:in `each'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/engine.rb:469:in `eager_load!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/engine.rb:346:in `eager_load!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/application/finisher.rb:56:in `each'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/application/finisher.rb:56:in `block in <module:Finisher>'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/initializable.rb:30:in `instance_exec'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/initializable.rb:30:in `run'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/initializable.rb:55:in `block in run_initializers'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:226:in `block in tsort_each'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:427:in `each_strongly_connected_component_from'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:347:in `block in each_strongly_connected_component'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:345:in `each'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:345:in `call'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:345:in `each_strongly_connected_component'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:224:in `tsort_each'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:205:in `tsort_each'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/initializable.rb:54:in `run_initializers'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/application.rb:352:in `initialize!'
from /app/config/environment.rb:5:in `<top (required)>'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `block in require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:240:in `load_dependency'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `require'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/application.rb:328:in `require_environment!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/commands/commands_tasks.rb:142:in `require_application_and_environment!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/commands/commands_tasks.rb:67:in `console'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/commands.rb:17:in `<top (required)>'
from /app/bin/rails:8:in `require'
from /app/bin/rails:8:in `<main>'
我尝试了互联网上流传的多种建议，但 none 到目前为止都有效。提前致谢！
快速 google 搜索将您的问题与需要更新的 responders gem 联系起来。请看this issue in Devise gem。只要 responders 是 Devise 依赖项，您就不需要将其包含在 Gemfile 中（在您的 Gemfile.lock 中仔细检查），您只需要更新到最新版本：
bundle update responders
如果 responders gem 不可用，则将 gem 'responders' 添加到您的 Gemfile 之前 运行 上一个命令。
希望对您有所帮助。
自从添加设计 gem 后，heroku 无法在生产环境中加载我的应用程序，出现应用程序错误：
An error occurred in the application and your page could not be served. Please try again in a few moments.
If you are the application owner, check your logs for details.
控制台的具体错误日志是
/app/vendor/bundle/ruby/2.1.0/gems/devise-3.3.0/app/controllers/devise_controller.rb:13:in `<class:DeviseController>': undefined local variable or method `mimes_for_respond_to' for DeviseController:Class (NameError)
from /app/vendor/bundle/ruby/2.1.0/gems/devise-3.3.0/app/controllers/devise_controller.rb:2:in `<top (required)>'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `block in require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:240:in `load_dependency'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:360:in `require_or_load'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:494:in `load_missing_constant'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:184:in `const_missing'
from /app/vendor/bundle/ruby/2.1.0/gems/devise-3.3.0/app/controllers/devise/confirmations_controller.rb:1:in `<top (required)>'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `block in require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:240:in `load_dependency'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:360:in `require_or_load'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:317:in `depend_on'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:233:in `require_dependency'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/engine.rb:472:in `block (2 levels) in eager_load!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/engine.rb:471:in `each'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/engine.rb:471:in `block in eager_load!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/engine.rb:469:in `each'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/engine.rb:469:in `eager_load!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/engine.rb:346:in `eager_load!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/application/finisher.rb:56:in `each'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/application/finisher.rb:56:in `block in <module:Finisher>'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/initializable.rb:30:in `instance_exec'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/initializable.rb:30:in `run'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/initializable.rb:55:in `block in run_initializers'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:226:in `block in tsort_each'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:427:in `each_strongly_connected_component_from'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:347:in `block in each_strongly_connected_component'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:345:in `each'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:345:in `call'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:345:in `each_strongly_connected_component'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:224:in `tsort_each'
from /app/vendor/ruby-2.1.5/lib/ruby/2.1.0/tsort.rb:205:in `tsort_each'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/initializable.rb:54:in `run_initializers'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/application.rb:352:in `initialize!'
from /app/config/environment.rb:5:in `<top (required)>'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `block in require'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:240:in `load_dependency'
from /app/vendor/bundle/ruby/2.1.0/gems/activesupport-4.2.0.rc3/lib/active_support/dependencies.rb:274:in `require'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/application.rb:328:in `require_environment!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/commands/commands_tasks.rb:142:in `require_application_and_environment!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/commands/commands_tasks.rb:67:in `console'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /app/vendor/bundle/ruby/2.1.0/gems/railties-4.2.0.rc3/lib/rails/commands.rb:17:in `<top (required)>'
from /app/bin/rails:8:in `require'
from /app/bin/rails:8:in `<main>'
我尝试了互联网上流传的多种建议，但 none 到目前为止都有效。提前致谢！
快速 google 搜索将您的问题与需要更新的 responders gem 联系起来。请看this issue in Devise gem。只要 responders 是 Devise 依赖项，您就不需要将其包含在 Gemfile 中（在您的 Gemfile.lock 中仔细检查），您只需要更新到最新版本：
bundle update responders
如果 responders gem 不可用，则将 gem 'responders' 添加到您的 Gemfile 之前 运行 上一个命令。
希望对您有所帮助。