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PORails ajax form entry shown twice
 

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    <p>Hello I want to write a small blog with Ruby on Rails (3), with posts and comments submitted via a ajax form.</p> <p>But when I submit a comment it is often shown twice, and I got no idea why. when I write <strong>@post.comments.uniq</strong> in the _create.js.rjs file, it works fine but this seems not to be a clean solution. When I reload the page without ajax after inserting a comment the comment is also not shown twice. Only when I insert it via ajax.</p> <p>Here is the sourcecode of my project.</p> <pre><code>Blog::Application.routes.draw do root :to =&gt; 'posts#index' resources :posts do resources :comments end end </code></pre> <p><em>config/routes.rb</em></p> <pre><code>ActiveRecord::Schema.define(:version =&gt; 20100907105618) do create_table "comments", :force =&gt; true do |t| t.text "text" t.integer "post_id" t.datetime "created_at" t.datetime "updated_at" end create_table "posts", :force =&gt; true do |t| t.string "title" t.text "text" t.datetime "created_at" t.datetime "updated_at" end end </code></pre> <p><em>db/schema.rb</em></p> <pre><code>class Comment &lt; ActiveRecord::Base belongs_to :post default_scope :order =&gt; "id DESC" end </code></pre> <p><em>app/models/comment.rb</em></p> <pre><code>class Post &lt; ActiveRecord::Base has_many :comments end </code></pre> <p><em>app/models/post.rb</em></p> <pre><code>class PostsController &lt; ApplicationController def index @posts = Post.all end def show @post = Post.find(params[:id]) end end </code></pre> <p><em>app/controllers/posts_controller.rb</em></p> <pre><code>class CommentsController &lt; ApplicationController respond_to :js def create @post = Post.find(params[:post_id]) # if I write here p @post.comments.inspect # it shows that there where 2 comments with the same id, how could this be? @post.comments.create(params[:comment]) end end </code></pre> <p><em>app/controllers/comments_controller.rb</em></p> <pre><code>&lt;h2&gt;&lt;%= @post.title %&gt;&lt;/h2&gt; &lt;p&gt; &lt;%= @post.text %&gt; &lt;/p&gt; &lt;%= form_for [@post, Comment.new], :remote =&gt; true do |f| %&gt; &lt;%= f.text_area :text, :rows =&gt; 4 %&gt;&lt;br /&gt; &lt;%= f.submit "send" %&gt; &lt;% end %&gt; &lt;div id="comments_box"&gt; &lt;% if @post.comments.any? %&gt; &lt;%= render :partial =&gt; @post.comments %&gt; &lt;% else %&gt; No Comments yet &lt;% end %&gt; &lt;/div&gt; </code></pre> <p><em>app/views/posts/show.html.erb</em></p> <pre><code>&lt;div id="comment_&lt;%= comment.id %&gt;"&gt;&lt;%= comment.text %&gt;&lt;/div&gt; </code></pre> <p><em>app/views/comments/_comment.html.erb</em></p> <pre><code>page[:comment_text].clear page[:comments_box].replace_html :partial =&gt; @post.comments # ^ write here @post.comments.uniq it works page.visual_effect(:highlight, "comment_#{@post.comments.first.id}") </code></pre> <p><em>app/views/comments/create.js.rjs</em></p> <pre><code>&lt;% @posts.each do |post| %&gt; &lt;%= link_to post.title, post %&gt; &lt;% end %&gt; </code></pre> <p><em>app/views/posts/index.html.erb</em></p> <p>EDIT: </p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;Blog&lt;/title&gt; &lt;%= stylesheet_link_tag :all %&gt; &lt;%= javascript_include_tag :defaults %&gt; &lt;%= csrf_meta_tag %&gt; &lt;/head&gt; &lt;body&gt; &lt;%= yield %&gt; </code></pre> <p> <em>app/views/layouts/application.html.erb</em></p>
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