Question

could someone explain the code in catch_exceptions?

i have difficulties to understand.

thanks

class ApplicationController < ActionController::Base
  around_filter :catch_exceptions

  private

  def catch_exceptions
    yield
  rescue => exception
    logger.debug "Caught exception! #{exception}"
    raise
  end
end

Answer 1

Simple.

You need first to understand the concept of the around_filter. It puts something AROUND a method call. Also you need to understand YIELD, that is executing a block.

so if you have something like an Index action.

def index
  # run code run
end

that means it will be sent as a block to that around_filter, which will execute that just as if it were…

  def catch_exceptions
    def index
      #run code run
    end
  rescue => exception
    logger.debug "Caught exception! #{exception}"
    raise
  end