I want to stop the app start up from an initializer. Something like if a config isn't present, stop server/console, etc. Also send a message in order to explain the error.
Is there a way to do that?
I looked into initialization events but I cannot make it happen.
Thanks in advance.
Yeah, just raise an exception like you normally would:
raise StandardError, "Stopping app start up because something is missing"
If you're doing this because some config is missing, consider using something like Figaro which does this for you.
Figaro.require_keys("pusher_app_id", "pusher_key", "pusher_secret")
You can use the Kernel#abort method to do it. It'll stop the application with your provided message and won't throw up any error.
Example:
abort('You need to pass more info to start the application') if some_check_fails?