在rescue_from 后redirect_to 不起作用

Question

I am trying to catch a custom error, and redirect to root path after it occurs. My code in controller looks like this:

class ApplicationController < ActionController::Base
  protect_from_forgery with: :exception
  rescue_from Errors::MyError, :with => :my_error

  private

  def my_error
    redirect_to root_path, alert: "my Error"
  end
end

Redirect is not working, after error occurs I am still at the same page. What is funny, my server logs shows that I was redirected.

Redirected to http.....
Completed 302 Found in 1908ms (ActiveRecord: 0.5ms)

What happened? And why redirect havent occur?

Answer 1

When you are doing an AJAX call to your server, the browser expect the response to be in javascript ( you talk to me in the JS language, I answer using JS language too, quite simple ). In your case, you need to test if the request is HTML or Javascript, and use the corresponding redirect:

def my_error
  path_to_redirect = root_path

  if request.xhr? # tests if the request comes from an AJAX call
    render :js => "window.location = '#{path_to_redirect}'"
  else
    redirect_to path_to_redirect, alert: "my Error"
  end
end

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For more answers about AJAX redirects in Rails: Rails 3: How to "redirect_to" in Ajax call?