location_responder.rb
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	module Responders
	# Responder to accept callable objects as the redirect location.
	# Useful when you want to use the <tt>respond_with</tt> method with
	# a route that requires persisted objects, but the validation may fail.
	#
	# class ThingsController < ApplicationController
	# responders :location, :flash
	# respond_to :html
	#
	# def create
	# @thing = Things.create(params[:thing])
	# respond_with @thing, location: -> { thing_path(@thing) }
	# end
	# end
	#
	module LocationResponder
	def initialize(controller, resources, options = {})
	super

	if options[:location].respond_to?(:call)
	location = options.delete(:location)
	options[:location] = location.call unless has_errors?
	end
	end
	end
	end