Rails 如何在不重新加载页面的情况下将评论附加到一组微博中

Question

我有两个模型；微博和评论。微博有很多评论，评论属于微博。

首先。有一个 StaticPagesController 用于保存我的主页操作

class StaticPagesController < ApplicationController
  def home
    if logged_in?
      @micropost = current_user.microposts.build
      @feed_items = current_user.microposts.paginate(page: params[:page])
    end
  end
(..)

home.html.erb 呈现提要

= render 'shared/feed'

_feed.html.haml 呈现 feed_items

- if @feed_items.any?
  %ol.microposts
    = render @feed_items
  = will_paginate @feed_items

呈现 _micropost.html.haml

%li
  %div.comments{data: { mid: "#{micropost.id}"}}
    %div.comment_container{:id => "comments_for_#{micropost.id}"}
      %ul
        - comments = micropost.comments
        - comments.each do |comment|
          %li 
            %a{:href => user_path(comment.user), :class => "author"}
              = comment.user.name
            %span.comment_body= comment.body
            %span.comment_timestamp= "created " + time_ago_in_words(comment.created_at).to_s
    %div
      = form_for current_user.comments.build(:micropost_id => micropost.id), |
                                                   :remote => true do |f|
        = f.hidden_field :micropost_id
        = f.hidden_field :user_id
        = f.text_field :body, class: "form-control", placeholder: "What do you think?"
        = button_tag(type: 'submit', class: "btn btn-default") do
          %i.glyphicon.glyphicon-comment
          Comment

如果提交了评论，则会调用创建操作

class CommentsController < ApplicationController
  before_action :correct_user,   only: :destroy
  def create
    @micropost = Micropost.find(params[:comment][:micropost_id])
    @comments = @micropost.comments
    @comment = current_user.comments.build(comment_params)
    @comment.save
    respond_to do |format|
      format.js
      format.html
    end
  private
    def comment_params
      params.require(:comment).permit(
        :id, :body, :user_id, :micropost_id)
    end
    def correct_user
      @comment = current_user.comments.find_by(id: params[:id])
      redirect_to root_url if @comment.nil?
    end
end

create.js.erb

var mid = $(".comment_container").parent(".comments").data('mid');
$("#comments_for_" + mid).html("<%= escape_javascript(render('comments/comment')) %>")

我的目标是在不重新加载整个页面的情况下向其相关微博添加新评论。

我用 %div.comments{data: { mid: "#{micropost.id}"}} 将 micropost.id 放入标记中，并尝试通过其父标签捕获微博最后（重新）使用部分

呈现评论

但是这个 returns 总是相同的 id 并且在同一个微博中插入每个新评论。

我怎样才能知道 create.js.erb 中评论的 micropost.id？

_comment.html.erb

<ul>
  <% @comments.each do |comment| %>
    <li>
      <a class="author" href="<%= user_path(comment.user) %>">
        <%= comment.user.name %>
      </a>
      <span class="comment_body">
        <%= comment.body %>
      </span>
      <span class="comment_timestamp">
        <%= "created " + time_ago_in_words(comment.created_at).to_s %>
      </span>
    </li>
  <% end %>
</ul>

Answer 1

你能试试下面的方法吗:

在你的 create.js.erb 中：

$("#comments_for_#{@comment.micropost_id}%>").html("<%= escape_javascript(render('comments/comment')) %>");

我怀疑你的 jquery 选择器有问题，你可以更轻松地实现你想要的。

PS ：您不应该在局部变量中依赖实例变量。相反，通过本地将您的实例变量传递给部分变量。否则你的部分不能轻易重用。

Rails 如何在不重新加载页面的情况下将评论附加到一组微博中

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