如何在Ruby on Rails中捕获基本异常类？

Question

I'd like to catch any RoR exceptions in REST API application with 'rescue_from'.

rescue_from StandardError do |exception|
  message = Rails.env.production? ? 'API server error' : exception.message
  render json: {status: "Error", message: message}, status: :internal_server_error
end

but it catches too much irrelevant exceptions. Can I catch RoR exceptions only? Is it a good practice at all? If not, what else you can recommend?

Answer 1

Well, you can always go out and get an exhaustive list of all the Rails exceptions, but honestly your first step should be to decide what situations you want to rescue from and which you want to allow to behave catastrophically. Not all exceptions should be caught.

If you're dead set on catching all Rails exceptions you should go look at the api documentation for the version of rails you're on and find the base classes for the exceptions you care about. For example, if you're hoping to just catch all ActiveRecord ones, you can rescue from the base ActiveRecord::ActiveRecordError class.

Again, I'd stress that you should be approaching this from the other direction--not rescuing everything and then trying to thin it out, but by rescuing from the bare minimum and adding as needed.