I found this tutorial about how to build a simple voting system.
I already have a User and Post model (just included the relevant columns) and I'm using Devise:
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
migration:
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
views/pages/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 %>
Everything displays, there are no errors, but when I click vote up or vote down, absolutely nothing happens.
Any suggestions to fix this?
EDIT:
I don't see any error nor saving/creating messages in the terminal just stuff like this:
Started 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 Could not determine content-length of response body. Set content-length of the response or set Response#chunked = true
Started GET "/assets/application.js?body=1" for 127.0.0.1 at 2012-02-01 06:47:50 +0800
– alexchenco