Joe Half Face Joe Half Face - 2 months ago 19
Ruby Question

Why including Rescuable module doesn't work?

class MyKlass

include ActiveSupport::Rescuable

rescue_from Exception do
return "rescued"
end

#other stuff
end


MyKlass is pure ruby object, but defined inside Rails application.

If I try to invoke MyKlass instance in rails console and then apply to it method which certainly should raise Exception, nothing happens other than error expected to be rescued.

Answer

Here is how it should be used:

class MyKlass
  include ActiveSupport::Rescuable
  # define a method, which will do something for you, when exception is caught
  rescue_from Exception, with: :my_rescue

  def some_method(&block)
    yield
  rescue Exception => exception
    rescue_with_handler(exception) || raise
  end

  # do whatever you want with exception, for example, write it to logs
  def my_rescue(exception)
    puts "Exception catched! #{exception.class}: #{exception.message}"
  end
end

MyKlass.new.some_method { 0 / 0 }
# Exception catched! ZeroDivisionError: divided by 0
#=> true

It goes without saying, that rescuing Exception is a crime.

Comments