Rails应用启动时的加载顺序

Rails2.3的时候, 启动应用后的加载顺序：

  1. config/preinitializer.rb
  2. config/environment.rb
  3. config/environments/#{RAILS_ENV}.rb
  4. plugin initialization
  5. gem initialization
  6. config/initializer/*.rb
  7. all after_initialize blocks, in the order they were defined in (so same order as above)
  8. any junk left below the Rails::Initializer.run call/block in environment.rb

在 Rails3 之后, 引入了Bundler，并且移除了preinitializer，加载顺序变成了

  1. config/application.rb
  2. gems initialization
  3. config/environment.rb
  4. config/environments/#{RAILS_ENV}.rb
  5. plugin initialization
  6. your rails app initialization
  7. config/initializer/*.rb

如果想要在整个Rails项目之前加载代码需要写在config/application.rb中的require ‘rails/all’之前。

参考：