基于Ajax的micropost的评论（Ruby on Rails）

Question

I have ajax based micropost's comments on the user page. It works, but not correctly. When I submit a new comment to any micropost, it always posts to the last micropost. Then, if I refresh the page by "F5", everything falls into place - the new comment is in the correct micropost. Thanks in advance.

comment.rb

class Comment < ActiveRecord::Base
  attr_accessible :comment_content
  belongs_to :user
  belongs_to :micropost
end

comments_controller.rb

class CommentsController < ApplicationController
  before_filter :signed_in_user, only: [:create, :destroy]

   def create
    @micropost = Micropost.find(params[:micropost_id])
    @comment = Comment.new(params[:comment])
    @comment.micropost = @micropost
    @comment.user = current_user
      respond_to do |format|
      @comment.save
           format.html { redirect_to current_user }
           format.js
      end
   end 
end

_micropost.html.erb

<tr>
  <td class="micropost">
    <span class="content"><%= wrap(micropost.content) %></span>
    <span class="timestamp">
    Posted <%= time_ago_in_words(micropost.created_at) %> ago.
    </span>
    <%= render 'shared/comment_form', micropost: micropost %>
   <div id="comments">
     <%= render micropost.comments %>
   </div>
  </td>
</tr>

_comment_form.html.erb

<%= form_for ([micropost, @comment]), :remote => true do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<%= f.text_area :comment_content, :size => "40x2" %>
  <button class="btn" type="submit">
    Comment
  </button>
<% end %>

_comment.html.erb

<span style="width: 100%; background:#dff0d8"><%= wrap(comment.comment_content) %></span>
<span class="timestamp">
 Posted by <%= comment.user.name %> <%= time_ago_in_words(comment.created_at) %> ago.
</span>

create.js.erb

$('#comments').html("<%= escape_javascript(render(:partial => @micropost.comments)) %>");

Answer 1

Maybe you can change

@comment = Comment.new(params[:comment])
@comment.micropost = @micropost

to

@comment = @micropost.comments.build(params[:comment])