Zeitwerk integration in Rails 6.0 The 88th RubyKansai

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Agenda ● Zeitwerk integration in Rails 6.0 ● What is Zeitwerk? ● Why use Zeitwerk? ● How use Zeitwerk? ● Conclusion

Zeitwerk integration in Rails 6.0

Zeitwerk is default (Rails >= v6.0) rails/railties/lib/rails/application/configuration.rb

You can use classic loader https://guides.rubyonrails.org/autoloading_and_reloading_constants.html#opting-out

But deprecation　 　　

Load code at startup with Zeitwerk rails/railties/lib/rails/application/finisher.rb

What is Zeitwerk?

Zeitwerk ● Gem (https://github.com/fxn/zeitwerk) ● Zeitwerk is an efficient and thread-safe code loader for Ruby ● You can load modules with autoloading or eager loading ● Without ‘require’ ● You can also reload modules ● Using Kernel.#autoload ● Implicit namespaces ● Explicit namespaces ● Nested root directories

No dependencies!!! zeitwerk/zeitwerk.gemspec

Pure Ruby　　　

Why use Zeitwerk?

Zeitwerk (Pros) ● Efficient and thread-safe ● You can load modules with autoloading or eager loading ● Without ‘require’ ● You can also reload modules ● Using Kernel.#autoload ● Implicit namespaces ● Explicit namespaces ● Nested root directories ● No dependencies

Zeitwerk (Cons) ● ...

How use Zeitwerk?

Normally

That’s it　　

Implicit namespaces

Explicit namespaces

For Gem

Demo

Conclusion ● Zeitwerk is Cool !!! ● Zeitwerk integration in Rails 6.0 ● You can build library without ‘require’ ● You can use it easily

Enjoy Ruby with Zeitwerk　　

Thanks