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thoughtbot--factory_bot_rails/spec
Daniel Colson bfee5d8dcc Set up reloading after_initialize
Alternate fix for #336. We went with #347 instead because the solution
in this commit didn't work with Rails 4.2. Since we are no longer
supporting Rails 4.2, I think this is a better approach.

The original problem looked like this:

Rails runs all of the initializers
1. Run the ["factory_bot.set_factory_paths"][set_factory_paths]
initializer
2. Run the ["factory_bot.register_reloader"][register_reloader]
initializer, which sets up a [prepare callback][]
3. Run the [`:run_prepare_callbacks`][] initializer
4. This triggers the factory_bot [prepare callback][], which causes
factory\_bot to [reload][]

Rails runs `after_initialize` callbacks
1. [I18n initializes]
2. factory\_bot [reloads again][] as described in #334

Triggering the first factory_bot reload before initializing I18n could
cause an error in some cases.

We avoided the problem in #347 by adding a conditional to skip reloading
factory_bot before the application has initialized.

This commit, on the other hand, moves factory_bot reloading from a
prepare callback into an `after_initialize` callback. The initialization
process is now simplified to:

Rails runs all of the initializers
1. Run the ["factory_bot.set_factory_paths"][set_factory_paths]
2. Run the [`:run_prepare_callbacks`][] initializer, which no longer
involves factory_bot

Rails runs `after_intialize` callbacks
1. [I18n initializes]
2. factory_bot loads definitions for the first time. It then runs the
reloader to set up the prepare callback to reload factory_bot when the
application reloads (for example by calling `reload!` in the console),
and to register the reloader to trigger reloads when any factory_bot
definition files change.

[set_factory_paths]: 3815aae2b9/lib/factory_bot_rails/railtie.rb (L17-L19)
[register_reloader]: 3815aae2b9/lib/factory_bot_rails/railtie.rb (L21-L23)
[prepare callback]: https://github.com/thoughtbot/factory_bot_rails/blob/master/lib/factory_bot_rails/reloader.rb#L34-L36
[`:run_prepare_callbacks`]: https://github.com/rails/rails/blob/5-2-stable/railties/lib/rails/application/finisher.rb#L62-L64
[reload]: https://github.com/thoughtbot/factory_bot_rails/blob/master/lib/factory_bot_rails/reloader.rb#L24-L26
[I18n initializes]: 13e2102517/activesupport/lib/active_support/i18n_railtie.rb (L16-L20)
[reloads again]: https://github.com/thoughtbot/factory_bot_rails/blob/master/lib/factory_bot_rails/railtie.rb#L25-L27
2020-06-15 11:15:46 -04:00
..
factory_bot_rails Set up reloading after_initialize 2020-06-15 11:15:46 -04:00
fixtures Allow reloading of factory definitions 2018-09-08 02:21:47 +00:00
fake_app.rb Allow reloading of factory definitions 2018-09-08 02:21:47 +00:00
spec_helper.rb Allow reloading of factory definitions 2018-09-08 02:21:47 +00:00