單擊投票上/下（Rails）後，簡單的投票系統不會添加投票數據庫？

Question

我找到this關於如何構建一個簡單的投票系統的教程。

我已經有一個用戶和後模型（包括只相關列）和我使用設計：

create_table "posts", :force => true do |t| 
    t.string "content" 
    t.integer "user_id" 
    t.string "title" 
    t.integer "total_value", :default => 0 // Added by following the tutorial 
    end 

    create_table "users", :force => true do |t| 
    t.string "username" 
    end 

post.rb：

class Post < ActiveRecord::Base 
    attr_accessible :title, :content 

    belongs_to :user 
    has_many :comments, :dependent => :destroy 
    has_many :votes, :dependent => :destroy 
end 

user.rb：

class User < ActiveRecord::Base  
    has_many :posts, :dependent => :destroy 
    has_many :comments, :dependent => :destroy 
end 

vote.rb：

class Vote < ActiveRecord::Base 
    belongs_to :post 
end 

遷移：

class CreateVotes < ActiveRecord::Migration 
    def change 
    create_table :votes do |t| 
     t.integer :post_id 
     t.integer :user_id 
     t.boolean :value 

     t.timestamps 
    end 

    add_index :votes, [:post_id, :user_id] 
    end 
end 

votes_controller.rb：

class VotesController < ApplicationController 
    def vote_up 
    check = Votes.find(:first, 
         :conditions => ["user_id = ? AND post_id = ?", session[:user_id], params[:id]]) 

    post = Post.find(params[:id]) 

    if check.nil? 
     vote = Votes.new 
     vote.post_id = params[:id] 
     vote.user_id = session[:user_id] 
     vote.value = true 
     vote.save 
     post.total_value += 1 
     post.save 
     render :text => post.total_value 
    elsif check.value == false 
     check.value = true 
     check.save 
     post.total_value += 2 
     post.save 
     render :text => post.total_value 
    else 
     render :text => "You have already voted up for this post." 
    end 
    end 

    def vote_down 
    check = Vote.find(:first, 
         :conditions => ["user_id = ? AND post_id = ?", session[:user_id], params[:id]]) 

    post = Post.find(params[:id]) 

    if check.nil? 
     vote = Vote.new 
     vote.post_id = params[:id] 
     vote.user_id = session[:user_id] 
     vote.value = true 
     vote.save 
     post.total_value -= 1 
     post.save 
     render :text => post.total_value 
    elsif check.value == true 
     check.value = false 
     check.save 
     post.total_value -= 2 
     post.save 
     render :text => post.total_value 
    else 
     render :text => "You have already voted down for this post." 
    end 
    end 
end 

組

的意見/頁/ index.html.erb：

<% for i in @posts %> 
    <h2><%= i.title %></h2> 
    <p><%= i.content %></p> 

    <div id="total_value_<%= i.id %>"><%= i.total_value %></div> 

    <%= link_to "Vote up", :url => {:controller => :votes, :action => :vote_up, :id => i.id}, 
          :update => "total_value_#{i.id}", 
          :remote => true %> 
    <%= link_to "Vote down", :url => {:controller => :votes, :action => :vote_down, :id => i.id}, 
          :update => "total_value_#{i.id}", 
          :remote => true %> 
<% end %> 

一切都顯示，沒有錯誤，但是當我點擊投票向上或否決，絕對沒有任何反應。

任何建議來解決這個問題？

編輯：

我沒有看到任何錯誤，也沒有保存/終端創建消息只是這樣的東西：

入門GET「/assets/application.js?body= 1「for 127.0.0.1 at 2012-02-01 06:47:50 +0800 Served asset /application.js - 304 Not Modified（0ms）[2012-02-01 06:47:50] WARN無法確定 響應主體的內容長度。響應或 設定的響應＃集內容長度分塊=

Answer 1

這可能是一個錯字，但你不應該有，Vote.new，Vote.find，

相反，你必須真正的投票。 find and Votes.new

class VotesController < ApplicationController 
    def vote_up 
    check = Votes.find(:first, 
         :conditions => ["user_id = ? AND post_id = ?", session[:user_id], params[:id]]) 

    post = Post.find(params[:id]) 

    if check.nil? 
     vote = Votes.new 
     vote.post_id = params[:id] 
     vote.user_id = session[:user_id] 
     vote.value = true 
     vote.save 
     post.total_value += 1 
     post.save 
     render :text => post.total_value 
    elsif check.value == false 
     check.value = true 
     check.save 
     post.total_value += 2 
     post.save 
     render :text => post.total_value 
    else 
     render :text => "You have already voted up for this post." 
    end 
    end 

    def vote_down 
    check = Vote.find(:first, 
         :conditions => ["user_id = ? AND post_id = ?", session[:user_id], params[:id]]) 

    post = Post.find(params[:id]) 

    if check.nil? 
     vote = Vote.new 
     vote.post_id = params[:id] 
     vote.user_id = session[:user_id] 
     vote.value = true 
     vote.save 
     post.total_value -= 1 
     post.save 
     render :text => post.total_value 
    elsif check.value == true 
     check.value = false 
     check.save 
     post.total_value -= 2 
     post.save 
     render :text => post.total_value 
    else 
     render :text => "You have already voted down for this post." 
    end 
    end 
end 

將其改爲Vote.new和Vote.find並參閱。

UPDATE：

我建議你使用調試器的寶石。 另一個建議是使用這個功能的寶石。這裏有很多寶石。 vote_fu和acts_as_votable是兩個最常用的。