Rails Ajax 使用局部变量渲染部分内容

Question

嘿，我正在尝试使用 ajax 渲染部分内容，一切都以 rails 正常形式工作，但是当我使用 ajax 局部变量渲染部分内容时，我正在尝试创建一个喜欢和不喜欢的系统，我已经创建了一个这里称为 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 时，我在下面调用此操作：

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

我收到错误没有路线匹配

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

我不喜欢的链接是这样的，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 没有得到任何价值，我应该做什么。获取 feed.id 的值。 feed.id 来自名为 Feed 的模型，它正在查看中，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 %>

而@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

还有静态页面控制器：

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

您的提要为 nil，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

Answer 2

您的 javascript 文件中的 Feed 定义看起来不正确。试试这个：

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