rails skip an after_action in a controller/method

In my controller I have an after_action block. I want to stop the after_action from running when the method in question fails.

Rails 4.2, ruby 2.2

Does anyone know how to do this in rails?

class MyController  < ApplicationController

  after_action only: :show do
    # do so and so
  end

  def show
    begin
      # something really bad happens here... My Nose!

    rescue => e 

      # how do I stop after_action from running?

      flash[:error] = 'Oh noes... Someone make a log report'
      redirect_to '/'
      return
    end

    # yarda yarda yarda

  end
end

I would do it like this. Set an instance variable if the the show action errors and check that variable in the after action:

class MyController  < ApplicationController

  after_action only: :show do
    unless @skip_after_action
      # after action code here
    end
  end

  def show
    begin
      # something really bad happens here...
    rescue => e 
      @skip_after_action = true
      flash[:error] = 'Oh noes... Someone make a log report'
      redirect_to '/'
    end
  end
end