Rails: Catch all exceptions in a rails controller

Question

Is there a way to catch all uncatched exceptions in a rails controller, like this:

def delete   schedule_id = params[:scheduleId]   begin     Schedules.delete(schedule_id)   rescue ActiveRecord::RecordNotFound     render :json => "record not found"   rescue ActiveRecord::CatchAll     #Only comes in here if nothing else catches the error   end   render :json => "ok" end

Thank you

Answer 1

You can also define a rescue_from method.

class ApplicationController < ActionController::Base   rescue_from ActionController::RoutingError, :with => :error_render_method    def error_render_method     respond_to do |type|       type.xml { render :template => "errors/error_404", :status => 404 }       type.all  { render :nothing => true, :status => 404 }     end     true   end end 

Depending on what your goal is, you may also want to consider NOT handling exceptions on a per-controller basis. Instead, use something like the exception_handler gem to manage responses to exceptions consistently. As a bonus, this approach will also handle exceptions that occur at the middleware layer, like request parsing or database connection errors that your application does not see. The exception_notifier gem might also be of interest.

Answer 2

begin   # do something dodgy rescue ActiveRecord::RecordNotFound   # handle not found error rescue ActiveRecord::ActiveRecordError   # handle other ActiveRecord errors rescue # StandardError   # handle most other errors rescue Exception   # handle everything else   raise end