Rails Ajax 使用局部变量渲染部分

Question

嘿，我正在尝试使用 ajax 渲染部分，一切都以 rails 正常形式工作，但是当我使用 ajax 局部变量渲染部分时，我是尝试为此创建一个喜欢和不喜欢的系统我在这里创建了一个名为 FeedLike 的模型我可以使用简单的创建和销毁来喜欢和不喜欢但是当我使用 ajax 并且我在下面调用此操作时：

$('#feed_like').html("<%= j render :partial => 'shared/dislike', :locals => { feed: @feed= @feed} %>");

我收到错误消息，没有路由匹配

{:action=>"destroy", :controller=>"feed_likes", :feed_id=>nil, :user_id=>1}

我不喜欢 link 是这样的，它是下面的部分：

 <div id="feed_dislike">
    <%= link_to "Dislike",{ :action => 'destroy', :controller => 'feed_likes', :feed_id => @feed, :user_id => current_user.id }, class: "btn btn-primary" %>
        </div>

当我不使用 ajax 时一切正常，但是当我渲染部分时，为什么 @feed 没有得到任何值我应该做什么。获取 feed.id 的值。 feed.id 来自名为 Feed 的模型，正在查看，我正在使用 partials 渲染这两种形式。

现在我正在粘贴一些代码，这些代码将为您提供我正在做的事情：

     #shared/_feed.html.erb
    <% if @feed_items.try(:any?) %>  
        <ol class="microposts">
            <%= render @feed_items %>

          </ol>
          <%= will_paginate @feed_items %>
        <% end %>

@feed_items 来自：

      #feeds/_feed.html.erb
     <li id="feed-<%= feed.id %>">
      <%= image_tag(current_user.avatar.url(:thumb), :size => '50x50') %>
      <span class="user"><%= link_to feed.user.name, feed.user %></span>
      <span class="content"><%= feed.content %></span>
      <span class="timestamp">
        Posted <%= time_ago_in_words(feed.created_at) %> ago.
      </span>

      <%  @like =FeedLike.where(:user_id => "#{current_user.id}", :feed_id => "#{feed.id}")
        %>


    <%= render :partial => 'shared/feed_like', locals: { feed: @feed= feed.id} %>
    </li>

现在 feed_like 部分 :

    #shared/_feed_like.html.erb
   <% if @like.count == 0 %> 

              <%= render :partial => 'shared/like', locals: { feed1: @feed= @feed} %>

              <% else %>

           <%= render :partial => 'shared/dislike', locals: { feed:  @feed} %>
            <% end %>

控制器代码：

     class FeedsController < ApplicationController

            before_action :authenticate_user! ,only: [:create, :destroy]
          def create
              @feed = current_user.feeds.build(feed_params)
              @feed_likes = FeedLike.new
              if @feed.save
                 #redirect_to root_url
                respond_to do |format|

                format.html { redirect_to root_url }
                format.js
              end
               else
              respond_to do |format|

                format.html { redirect_to root_url }
                format.js { render :js=>'alert("you can not leave post empty");' }
              end
            end
            end

            def destroy
            end

            private

              def feed_params
                params.require(:feed).permit(:content)
              end
          end

FeedsLike 控制器：

                class FeedLikesController < ApplicationController
            before_action :authenticate_user! ,only: [:create, :destroy]

              def index
                @fees = FeedLike.all
                respond_to do |format|

                        format.html 
                        format.js


                        end
              end
            def update
                @feed_likes = FeedLike.find_or_create_by(feed_like_params)
                    respond_to do |format|
                        if @feed_likes.save
                        format.html { redirect_to root_url, notice: 'Like ' }

                        else

                        end
                   end
            end
              def create
                    @feed_likes = FeedLike.find_or_create_by(:feed_id => params[:feed_id],:user_id =>params[:user_id])
                    respond_to do |format|
                        if @feed_likes.save
                        format.html { redirect_to root_url, notice: 'Like ' }
                        format.js
                        else

                        end
                   end
              end


              def delete

              end

              def destroy
                  @feed_likes = FeedLike.where(:feed_id => params[:feed_id],:user_id =>params[:user_id])
                   respond_to do |format|
                       if @feed_likes.destroy_all
                       format.html { redirect_to root_url, notice: 'Unlike ' }
                       else

                       end
                   end
              end
              def feed_like_params
                  params.require(:feed_like).permit(:user_id, :feed_id)
                  #params[:market_place]
                end


              end

和静态页面控制器：

class StaticPagesController < ApplicationController
                before_action :authenticate_user!
              def home

             if user_signed_in?
                 @feed_likes = current_user.feed_likes.new
                 @feed  = current_user.feeds.build
                 @feed_items = current_user.feed.paginate(page: params[:page])
                 # @likes = Feed.find(:all, 
                 #    :select => '"feeds".id, "feeds".content, count("feed_likes".id) as Like', 
                 #    :from => :feeds, 
                 #    :left_join => '"feed_likes"', 
                 #    :on => '"feeds".id = "feed_likes"."feed".id', 
                 #    :limit => 5
                 #  )

                 # @like =Feed.find_by_sql "

                 #        SELECT id
                 #        FROM feed_likes
                 #        WHERE user_id = #{current_user.id}
                 #        AND feed_id =#{feed.id}
                 #        LIMIT 0 , 30

                 #    "
                end
              end

              def help
              end


              def about
              end

             def contact
             end


            end

Answer 1

您的 Feed 定义在您的 javascript 文件中看起来有误。试试这个：

$('#feed_like').html("<%= j render :partial => 'shared/dislike', :locals => { feed: @feed} %>");

Answer 2

您的 Feed 为零，这就是它崩溃的原因

请将此添加到您的 feed_likes 控制器中。

before_action :get_feed ,only: [:create, :destroy]

并在底部添加此方法

def get_feed
  @feed= Feed.find(params[:feed_id])
end

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