带有Rails后端的Ember TodoMVC应用程序没有'Access-Control-Allow-Origin'标题

时间:2014-06-21 06:32:50

标签: ruby-on-rails ember.js cors ember-cli todomvc

我正在尝试遵循Ember入门指南并构建一个TodoMVC应用程序,但使用Ember-CLI和Rails作为后端。不幸的是,我遇到了跨站点域名的问题。我收到此错误消息,我尝试发布帖子请求:

XMLHttpRequest cannot load http://localhost:3000/api/todos. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:4200' is therefore not allowed access.

在Rails端我安装了Rack Cors。我已将它添加到我的Gemfile中:

gem 'rack-cors', :require => 'rack/cors'

在我的application.rb文件中,我有:

module Todoemberrails
  class Application < Rails::Application
    config.assets.enabled = false

    config.middleware.use Rack::Cors do
      allow do
        origins '*'
        resource '*', headers: :any, methods: [:get, :post, :put, :delete, :options]
      end
    end
  end
end

这是我的控制者:

class Api::TodosController < ApplicationController
  def index
    render json: Todo.all
  end

  def show
    render json: Todo.find(params[:id])
  end

  def create
    todo = Todo.new(todo_params)

    if todo.save
      render json: todo, status: :created
    else
      render json: todo.errors, status: :unprocessed
    end
  end

  private

  def todo_params
    params.require(:todo).permit(:title, :is_completed)
  end
end

在我app/adapters/application.js的{​​Ember'应用中,我有:

import DS from 'ember-data';

export default DS.RESTAdapter.extend({
  host: 'http://localhost:3000/api'
});

1 个答案:

答案 0 :(得分:0)

Rails默认不允许这样做,以防止跨站点脚本。

如果你想在整个主板上允许这个,你可以将它添加到你的ApplicationController:

  after_filter :cors_set_access_control_headers

  def cors_set_access_control_headers
    headers['Access-Control-Allow-Origin']      = '*'
    headers['Access-Control-Allow-Methods']     = 'POST, GET, OPTIONS'
    headers['Access-Control-Max-Age']           = '1728000'
    headers['Access-Control-Allow-Credentials'] = 'true'
  end

开始使用Ember指南,,但不适用于制作应用。