redirect_back in Rails 5

redirect_back in Rails 5 is handy:

redirect_back(fallback_location: whatever_path)

fallback_location is used when HTTP_REFERER is not present.

In Rails 4 we had to use redirect_to :back and rescue RedirectBackError:

class MyController < ApplicationController
    rescue_from ActionController::RedirectBackError, with: :redirect_to_default

    def action
      redirect_to :back


    def redirect_to_default
      redirect_to root_path

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