[Rails] Re: Hook into Exception Chain

Thanks a lot! That's useful

On Saturday, 16 November 2013 22:36:35 UTC+1, Frederick Cheung wrote:

On Friday, November 15, 2013 10:26:10 AM UTC, sol wrote:

I've used the above approach now

However, this only works for controller actions.

I've got some cronjobs in the project (lib folder) as well as a sinatra app that is mounted within the rails app.

Is there any way I could catch the exceptions in these parts as well?

For a cronjob type thing it's up to you to wrap your script with something that will log the error. My cronjobs normally end up looking like

TaskWrapper('some job') do

  #work here

end

and elsewhere

def TaskWrapper

  begin

    yield

  rescue Exception => ex

    #do something with the exception

    raise

  end

end

I use rescue Exception because for once I think it's appropriate that things like SyntaxError are caught so that I can be notified about them

For the sinatra (or even the rails case) you could write a rack middleware that would look something like

class ErrorNotifier

  def initialize(app)

    @app = app

  end

  def call(env)

    begin

      @app.call(env)

    rescue Exception => ex

      #do something with the exception

      raise

   end

  end

end

 

You could also render an error message if you want to override that.

You might also be interested in the exception handling stuff described at http://blog.plataformatec.com.br/2012/01/my-five-favorite-hidden-features-in-rails-3-2/

Fred

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