解决方案

Question

我可以点击链接一次，计数会更新，但之后的点击不会更新，也不会更新到数据库中（查看控制台）。

index.html.haml

.votes
  - if current_user.liked? skit
    = link_to unlike_skit_path(skit), method: :get, remote: true, class: "unlike-post" do
      .upvote
        %span.upvote-link
          %i.fa.fa-caret-up
        .vote-count= skit.votes_for.size
  - else
    = link_to like_skit_path(skit), method: :get, remote: true, class: "like-post" do
      .upvote
        %span.upvote-link
          %i.fa.fa-caret-up
        .vote-count= skit.votes_for.size

的routes.rb

resources :skits do
  resources :challenges
  member do 
    get "like", to: "skits#like"
    get "unlike", to: "skits#unlike"
  end
end

unlike.js.erb

$('.unlike-post').bind('ajax:success', function(){
  $(this).find('.vote-count').html('<%= escape_javascript @skit.votes_for.size.to_s %>');
});

like.js.erb

$('.like-post').bind('ajax:success', function(){
  $(this).find('.vote-count').html('<%= escape_javascript @skit.votes_for.size.to_s %>');
});

skits_controller.rb

def like
  @skit.liked_by current_user
  respond_to do |format|
    format.html { redirect_to skits_path, notice: 'Successfully voted!' }
    format.js { render layout: false }
  end
end

def unlike
  @skit.unliked_by current_user
  respond_to do |format|
    format.html { redirect_to skits_path, notice: 'Successfully voted!' }
    format.js { render layout: false }
  end
end

修改

从底部应用帮助后，不保存到数据库中：

保存到数据库时：

Answer 1

要添加到@max的评论，您需要查看DRY代码（相应地使用HTTP Verbs和actions）：

# config/routes.rb
resources :skits do
  resources :challenges
  match :like, via: [:post, :delete], on: :member #-> url.com/skits/:id/like
end

# app/controllers/skits_controller.rb
class SkitsController < ApplicationController
   def like
       @skit.liked_by current_user   if request.post?
       @skit.unliked_by current_user if request.delete?
       respond_to do |format|
          format.html { redirect_to skits_path, notice: 'Successfully voted!' }
          format.js #-> format.js doesn't render layout anyway
       end       
   end
end

您将能够使用以下内容：

#app/views/skits/index.html.erb
<%= render @skits %>

#app/views/skits/_skit.html.erb
.votes
   - method =  current_user.liked?(skit) ? :post : :delete
   = link_to skit_like_path(skit), method: method, remote: true, id: skit.id do
      .upvote
        %span.upvote-link
          %i.fa.fa-caret-up
        .vote-count= skit.votes_for.size

解决方案

关于更新问题，您需要确保通过js.erb更新正确的元素：

#app/views/skits/like.js.erb
$("#<%=j @skit.id %>").find(".vote-count").html('<%=j @skit.votes_for.size.to_s %>');

您不需要将上述代码绑定到ajax:success - 调用format.js将在请求结束时运行代码。虽然这可能需要调整，但它应该可以工作。

Answer 2

这里的问题是您为此请求使用的HTTP方法，当您想从服务器获取信息时使用GET，但如果您想更新资源，则GET不是正确的方法。

如果我是你，我会使用PATCH方法：

HTTP方法PATCH可用于更新部分资源。对于例如，当您只需要更新资源的一个字段时，提供完整的资源表示可能很麻烦利用更多带宽

resources :skits do
  resources :challenges
  member do 
    patch :like
    patch :unlike
  end
end

更新haml中的method：

.votes
  - if current_user.liked? skit
    = link_to unlike_skit_path(skit), method: :patch, remote: true, class: "unlike-post" do
      .upvote
        %span.upvote-link
          %i.fa.fa-caret-up
        .vote-count= skit.votes_for.size
  - else
    = link_to like_skit_path(skit), method: :patch, remote: true, class: "like-post" do
      .upvote
        %span.upvote-link
          %i.fa.fa-caret-up
        .vote-count= skit.votes_for.size

另外，请确保您正在更新js.erb中的正确元素，对此的解决方案是使用@skit.id

#app/views/skits/like.js.erb
$("#<%=j @skit.id %>").find(".vote-count").html('<%=j @skit.votes_for.size.to_s %>');

顺便说一句，您不需要使用ajax:success。 format.js将为您处理

Rails 4 ajax充当可投票的turbo链接投票计数不更新

2 个答案:

解决方案