javascript - Rails ajax 从集合中追加单个项目

Question

在我的应用程序中，我有一个评论系统，它将评论显示为集合，并且我已经使用ajax评论工作，但目前它再次呈现整个集合，但我想要的只是 append 最新的评论。这是我的代码:

comments_controller.rb

class CommentsController < ApplicationController

before_filter :authenticate_member!
before_filter :load_commentable
before_filter :find_member

def index
   redirect_to root_path
end

def new
    @comment = @commentable.comments.new
end

def create
    @comment = @commentable.comments.new(params[:comment])
    @comment.member = current_member
    respond_to do |format|
        if @comment.save
          format.html { redirect_to :back }
          format.json
          format.js
        else
          format.html { redirect_to :back }
          format.json
          format.js
        end
    end 
end

def destroy
    @comment = Comment.find(params[:id])
    respond_to do |format|
        if @comment.member == current_member || @commentable.member == current_member
          @comment.destroy
          format.html { redirect_to :back }
        else
          format.html { redirect_to :back, alert: 'You can\'t delete this comment.' }
        end
    end 
end

private

def load_commentable
    klass = [Status, Medium, Project, Event, Listing].detect { |c| params["#{c.name.underscore}_id"] }
    @commentable = klass.find(params["#{klass.name.underscore}_id"])
end

def find_member
    @member = Member.find_by_user_name(params[:user_name])
end 

end

statuses_controller

def show
    @status = Status.find(params[:id])
    @commentable = @status
    @comments = @commentable.comments.order('created_at desc').page(params[:page]).per_page(15)
    @comment = Comment.new
    respond_to do |format|
      format.html # show.html.erb
      format.json { redirect_to profile_path(current_member) }
      format.js
    end
end

statuses/show.html.erb

<% if member_signed_in? %>
    <div id="comm_form_wrap">
        <%= render "shared/comment_form" %>
    </div>

    <div id="comments_<%= @commentable.id %>">
        <%= render partial: "shared/comments", :collection => @comments, :as => :comment %>
    </div>
<% end %>

shared/_comments.html.erb

<div id="comment_<%= comment.commentable.id %>_<%= comment.id %>" class="comments">
    <span class="comment_av">
        <%= comment_avatar_link_2 comment.member, :class => "com_av", title: comment.member.full_name, alt: comment.member.full_name %>
    </span>
    <span>

        <div class="comment_name">
            <% if comment.member == @commentable.member %>
                <%= link_to comment.member.user_name, profile_path(comment.member) %> <span class="owner">Creator</span>
            <% else %>
                <%= link_to comment.member.user_name, profile_path(comment.member) %>
            <% end %>

            <% if comment.member == current_member || @commentable.member == current_member %>
                <span class="comment_del">
                    <%= link_to image_tag("Delete.png", title: 'Delete'), [@commentable, comment], remote: true, method: :delete, data: { confirm: 'Are you sure?' } %>
                </span>
            <% end %>
            <span class="meta">
                <%= time_ago_in_words(comment.created_at) %>
            </span>
        </div>

        <div class="com_con">
            <%= Rinku.auto_link(comment.content).html_safe %>
        </div>
    </span>
</div>

comments/create.js.erb

$("#comments_<%= @commentable.id %>").html("<%= escape_javascript(render :partial => 'shared/comments', :collection => @comments, :as => :comment) %>");
$('#comment_form')[0].reset();

如果我只是在 create.js.erb 文件中将 html 更改为 append ，它将 append 整个评论集合。我想我可以从我的注释部分复制并粘贴代码，但这会是很多代码，而且我不知道如何以这种方式定义变量。对我来说 append 单个新评论的最佳方式是什么？提前致谢。

Answer 1

我能够解决这个问题。我可以像这样 append @comment 而不是渲染或 append 集合:

$("#comments_<%= @commentable.id %>").append("<%= escape_javascript(render :partial => @comment, :locals => {:comment => @comment}) %>");

然后我只需要在我的评论文件夹中创建一个 _comment.html.erb 部分。