ExceptionNotifier：Rails 生产模式下的模块迁移错误

Question

当我这样做时

rake db:migrate RAILS_ENV=production

它给了我

rake aborted!
NoMethodError: undefined method `new' for ExceptionNotifier:Module
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/actionpack-3.2.7/lib/action_dispatch/middleware/stack.rb:43:in `build'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/actionpack-3.2.7/lib/action_dispatch/middleware/stack.rb:113:in `block in build'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/actionpack-3.2.7/lib/action_dispatch/middleware/stack.rb:113:in `each'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/actionpack-3.2.7/lib/action_dispatch/middleware/stack.rb:113:in `inject'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/actionpack-3.2.7/lib/action_dispatch/middleware/stack.rb:113:in `build'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/railties-3.2.7/lib/rails/engine.rb:470:in `app'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/railties-3.2.7/lib/rails/application/finisher.rb:31:in `block in <module:Finisher>'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/railties-3.2.7/lib/rails/initializable.rb:30:in `instance_exec'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/railties-3.2.7/lib/rails/initializable.rb:30:in `run'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/railties-3.2.7/lib/rails/initializable.rb:55:in `block in run_initializers'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/railties-3.2.7/lib/rails/initializable.rb:54:in `each'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/railties-3.2.7/lib/rails/initializable.rb:54:in `run_initializers'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/railties-3.2.7/lib/rails/application.rb:136:in `initialize!'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/railties-3.2.7/lib/rails/railtie/configurable.rb:30:in `method_missing'
/home/ntf-25/hardik/ana/soqueen/config/environment.rb:5:in `<top (required)>'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/activesupport-3.2.7/lib/active_support/dependencies.rb:251:in `require'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/activesupport-3.2.7/lib/active_support/dependencies.rb:251:in `block in require'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/activesupport-3.2.7/lib/active_support/dependencies.rb:236:in `load_dependency'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/activesupport-3.2.7/lib/active_support/dependencies.rb:251:in `require'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/railties-3.2.7/lib/rails/application.rb:103:in `require_environment!'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/gems/railties-3.2.7/lib/rails/application.rb:292:in `block (2 levels) in initialize_tasks'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/bin/ruby_executable_hooks:15:in `eval'
/home/ntf-25/.rvm/gems/ruby-1.9.3-p545@shopqi/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => db:migrate => environment
(See full trace by running task with --trace)

这种错误，我添加什么配置来解决这个问题？

我的配置/environment.rb :-

# Load the rails application

需要 File.expand_path('../application', FILE)

初始化 Rails 应用程序

Demo::Application.initialize！

enviornment.rb 中没有任何内容，为什么会出现这个错误？ 出现此错误后，我还为 ExceptionNotifier 添加了 gem，但没有发生任何事情。

Answer 1

我找到了答案，使用最新版本的 gem 'exception_notification' 并根据情况配置 production.rb。

在我的情况下，我还必须在初始化程序下更新 middleware.rb。

Answer 2

你也可以试试

rake db:drop RAILS_ENV=production
rake db:create RAILS_ENV=production
rake db:migrate RAILS_ENV=production