Best place for Middlewares on Rails 6

Question

I'm currently on Rais 6 and using middlewares. I've something working but I don't like it. How should I improve it?

Currently my middlewares are here:

app/middleware/my_middleware.rb

And on config/application.rb I'm calling

require_relative '../app/middleware/my_middleware

Without require_relative it's not working. If I add them on app folder it's not working either. What am I missing?

Answer 1

Middleware cannot be reloaded because the middleware stack is setup during application boot and never rebuilt.

Because of that, you should tell the main autoloader to ignore the directory:

# config/initializers/zeitwerk.rb
Rails.autoloaders.main.ignore(Rails.root.join("app/middleware"))

and load the file yourself with require or require_relative just like you are doing.

There is some documentation about this use case here.