Callbacks are cleared if cache_classes if disabled in development

[Zank94]

Hello everyone,

I've just ran into the same problems as the ones mentioned in #155, even after updating to 1.8.1 to fix the eager_load related issue.
To prevent callbacks clearing in development, I have to set config.cache_classes value to true, which isn't very convenient since it involves restarting the server for changes to take effect.

Any help would be much appreciated :)

Thanks

[tansengming]

Hi @Zank94 I'm sorry to hear that you're having trouble with this. Would you mind sharing more details about this? These caching issues are really tough to debug and it'll make it a load easier to figure out with an example app.

[spodlecki]

I was also having trouble keeping the event callbacks from being reset. require is not causing the file to actually be loaded (not sure why... didn't dig in, might be something obvious that I'm missing.)

lib/stripe/engine.rb

    eager_load_classes = -> class_names {
      class_names.each do |constant|
        begin
          constant.to_s.camelize.constantize
        rescue NameError
          require constant
        end
      end
    }

Given this block, I attempted to run both the full paths and the class names.

    # Ruby 2.6.3
    rails (5.2.4.4)
    stripe (5.28.0)
    stripe-rails (2.2.1)
      rails (>= 5.1)
      responders
      stripe (>= 3.15.0)

Works once, after initial requests no callbacks executed

config.stripe.eager_load = Dir[Rails.root.join('app/services/stripe_events/*.rb').to_s]

Works, and reloads as files are changed

config.stripe.eager_load = Dir[Rails.root.join('app/services/stripe_events/*.rb').to_s].map do |file|
  '::StripeEvents::' + File.basename(file.chomp(File.extname(file))).classify
end

note: eager loading in rspec tests work in both formats.