使用ajax向ruby控制器发送数据

我想做的事情：

我正在创建一个ruby on rails应用程序，它有一个播放列表。播放列表属于用户对象，是一个散列。我需要两个关键的按钮。一个用于向哈希中添加新音乐，另一个用于从哈希中删除音乐。我使用javascript来跟踪当前歌曲，无论何时按下添加按钮，都应该通过ajax将其发送回add_song控制器，然后将字符串添加到播放列表哈希中。然而，我坚信我的实现是错误的，因为我一直得到一个500错误。目前我只担心add_song按钮。我们非常感谢您的帮助！

当前错误：岗位http://localhost:3000/adding500（内部服务器错误）

下面是我不引人注目的javascript代码：

var player = new Audio("File1.mp3");
var value = 1 ;
var track = "File.mp3";

function backward() {
         var temp2 = player.src[player.src.length - 5] ;

          if ( temp2 != 1){
                value = parseInt(temp2);
                value  -= 1;
                player.src = "/File"+value+".mp3";
                player.play();
}
}
function forward() {
           var temp2 = player.src[player.src.length - 5] ;
           if ( temp2 != "5")  {
                value = parseInt(temp2);
                value  += 1;
                player.src = "/File"+value + ".mp3";
                player.play();
}
  }
  function play(){
        player.src  = "/File"+value + ".mp3";
         player.play();
} 
  function pause( ) {
         player.pause();
}

 //add button
 //delete button


function get_song() {
 return player.src
}
$(document).ready(function() {
$("div div").click( function(){
 if ( this.id  ==  'play' ) {
        play();
 }else if(this.id == 'backward'){
        backward();
 }else if(this.id == 'forward'){
        forward();
  }else if(this.id == 'stop') {
    pause() ;
  }else if(this.id == 'add_song') {
    $.ajax({
    url: "adding",
    type: "post",
    data: {data_value: JSON.stringify(player.src)}
 });
 }
});
});

下面是我的静态页面控制器

   class StaticPagesController < ApplicationController
  respond_to :js, :json, :html
    def add_song()
           if user_signed_in?
                session[:user_id] = current_user.id
                present_user = User.find(session[:user_id])
                puts present_user
                present_user.playlist.store(params[:data_value], 1)
                present_user.save
                puts "It works"
        else
        end
        end
        def remove_song()
            if user_signed_in?
             session[:user_id] = current_user.id
             present_user = User.find(session[:user_id])
             present_user.playlist.delete(params[:data_value])
             present_user.save
            else
        end
        end


  def home
   end
end

最后下面是我的路线：

 devise_for :users, :controllers => { :sessions => "sessions" , :registrations => "registrations"}
  devise_scope :user do
    get   "/log_in" => "sessions#new" ,as: :new_user_sessions
     post  '/log_in' => "sessions#create" ,as: :user_sessions
    delete "/destroy" => "devise/sessions#destroy", as: :destroy_user
    get   '/edit' => 'devise/registrations#edit'
    get   "/sign_up" => "registrations#new", as: :new_user_registrations
    post  "/sign_up" => "registrations#create", as: :user_registrations
 end
  root 'static_pages#home'
  match '/home', to:'static_pages#home', via: 'get'
  match '/adding',   to: 'static_pages#add_song',   via: 'post'