ruby-on-rails - 为什么 Rails 3 中的 AJAX 如此困难？或者说，我做错了什么？

Question

我似乎没有一个教程能完成我想做的事情。非常简单，我希望用户能够向 Controller 提交 POST 请求(“喜欢”视频)并让 Controller 使用 JSON 对象进行响应。任何帮助将不胜感激。

谢谢

编辑因为SO搞乱了格式，这也是我的代码的要点: https://gist.github.com/813503

这是我的 Controller :

class LikesController < ApplicationController

  before_filter :get_ids

  respond_to :json, :js

  def videolink
    results = {}

    # check to see if the user has liked this videolink before
    if current_user
      liked = Like.video?(current_user, @vid_id)

      results["status"] = "OK"      
      results["liked"] = liked
    else
      results["status"] = "Error"
      results["message"] = "User not logged in"
    end

    respond_with( results.to_json ) 
  end


  def update
    results = {}

    if current_user
      results["status"] = "OK"  
    else
      results["status"] = "Error"
      results["message"] = "User not logged in"
    end

    respond_with( results.to_json )
  end


  private

  def get_ids
    @vid_id = params[:videolink_id]
  end

end

这是我的 JS 文件:

$("#likeVideo").click(function() {
    $.ajax({
        contentType: "application/json",
        data: { game_id: game_id,   videolink_id: current_video["videolink"]["id"] },
        dataType: "json",
        type: "POST",
        url: "/likes/" + game_id,
        success: function(data) {
            console.log("Success", data);
        }
    });     

    return false;
});

我的路线:

  resources :likes do
    collection do
      get "videolink"
    end

    member do
      post :update
    end
  end

这是我得到的错误:



<h1>
NoMethodError
in LikesController#update
</h1>



undefined method `{"status":"OK"}_url' for #<LikesController:0x0000010178be58>


Answer 1

如果你想发回自定义 JSON，而不是 respond_with(results.to_json)...只需渲染文本

render :text=>results.to_json

responds_with 是一种让您轻松发回对象及其位置 (url) 的方法。这就是为什么您的错误告诉您“_url”无效。

有关responds_with的更多信息，由http://ryandaigle.com/articles/2009/8/10/what-s-new-in-edge-rails-default-restful-rendering提供

If another format was requested, (i.e. :xml or :json)

• If it was a GET request, invoke the :to_format method on the resource and send that back
• If the resource has validation errors, send back the errors in the requested format with the :unprocessable_entity status code
• If it was a POST request, invoke the :to_format method on the resource and send that back with the :created status and the :location of the new created resource
• Else, send back the :ok response with no body