Question

我有两个型号; Micropost和评论。 Micropost有很多评论，评论属于Micropost。

首先。有一个StaticPagesController可以保存我的主页操作

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Feed

= 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，则称为创建操作

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为其相关微博添加新评论。

我把micropost.id放到%div.comments{data: { mid: "#{micropost.id}"}}的标记处，我试图通过其父标签捕获微博最后（重新）使用部分

呈现注释

但这会返回相同的id，并在同一个微博中插入每个新评论。

如何在create.js.erb中了解评论的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

您可以尝试以下方法：

在create.js.erb：

中

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

我怀疑你的jquery选择器出了问题，你可以更轻松地实现你想要的东西。

PS：您不应该依赖部分中的实例变量。相反，通过本地传递您的实例变量到部分。否则你的部分不能轻易重复使用。

Rails如何在没有页面重新加载的情况下将注释附加到微博集合

1 个答案: