Here is a simple method of defining custom errors in rails. A strategy that works well for us is to create an
ApplicationError module, then define errors classes within it.
# application_error.rb module ApplicationError CustomError = Class.new(StandardError) OtherCustomError = Class.new(StandardError) end
Then to use the newly defined class:
raise ApplicationError::CustomError.new('custom message')
We found this to be a neat and organized way to add custom classes, and there are likely many other features you could build into it but this approach worked well for us.