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Diffstat (limited to 'guides')
| -rw-r--r-- | guides/source/autoloading_and_reloading_constants.md | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/guides/source/autoloading_and_reloading_constants.md b/guides/source/autoloading_and_reloading_constants.md index 6298651e4a..b3f923a017 100644 --- a/guides/source/autoloading_and_reloading_constants.md +++ b/guides/source/autoloading_and_reloading_constants.md @@ -1350,3 +1350,34 @@ With the [Spring](https://github.com/rails/spring) pre-loader (included with new Occasionally you may need to explicitly eager_load by using `Rails .application.eager_load!` in the setup of your tests -- this might occur if your [tests involve multithreading](https://stackoverflow.com/questions/25796409/in-rails-how-can-i-eager-load-all-code-before-a-specific-rspec-test). + +## Troubleshooting + +### Tracing Autoloads + +Active Support is able to report constants as they are autoloaded. To enable these traces in a Rails application, put the following two lines in some initializer: + +```ruby +ActiveSupport::Dependencies.logger = Rails.logger +ActiveSupport::Dependencies.verbose = true +``` + +### Where is a Given Autoload Triggered? + +If constant `Foo` is being autoloaded, and you'd like to know where is that autoload coming from, just throw + +```ruby +puts caller +``` + +at the top of `foo.rb` and inspect the printed stack trace. + +### Which Constants Have Been Autoloaded? + +At any given time, + +```ruby +ActiveSupport::Dependencies.autoloaded_constants +``` + +has the collection of constants that have been autoloaded so far. |