Question

我正在尝试让我的表单提交并显示结果而不使用Ajax刷新页面。问题是，似乎没有返回方法，一旦提交，它们都会出现未定义。

_micropost.html.erb

  <li>
  <span class="content"><%= micropost.content %></span>
  <span class="timestamp">
    Posted <%= time_ago_in_words(micropost.created_at) %> ago.
  </span>
  <% if current_user?(micropost.user) %>
    <%= link_to "delete", micropost, method: :delete,
                                     data: { confirm: 'You sure?' },
                                     title: micropost.content %>
  <% end %>
</li>

create.js.erb

$(".microposts").append("<%= escape_javascript(render('shared/feed')) %>")

microposts_controller.rb

class MicropostsController < ApplicationController

  before_filter :authenticate
  before_filter :authroized_user, :only => :destroy
  def create
    @micropost = current_user.microposts.build(params[:micropost])
    if @micropost.save!
      respond_to do |format|
        format.html { redirect_to @user }
        format.js
      end
  end
end

  def destroy
    @micropost.destroy
    redirect_to root_path, :flash => { :success => "Micropost deleted!" }
  end

  private
  def authroized_user
    @micropost = Micropost.find(params[:id])
    redirect_to root_path unless !current_user?(@micropost.user)    
  end

end

_feed.html.erb

<% if @feed_items.any? %>
  <ol class="microposts">
    <%= render partial: 'shared/feed_item', collection: @feed_items %>
  </ol>
  <%= will_paginate @feed_items %>
<% end %>

_feed_item.html.erb

<li id="<%= feed_item.id %>">
  <%= link_to gravatar_for(feed_item.user), feed_item.user %>
  <span class="user">
    <%= link_to feed_item.user.name, feed_item.user %>
  </span>
  <span class="content"><%= feed_item.content %></span>
  <span class="timestamp">
    Posted <%= time_ago_in_words(feed_item.created_at) %> ago.
  </span>
  <% if !current_user?(feed_item.user) %>
    <%= link_to "delete", feed_item, method: :delete,
                                     data: { confirm: "You sure?" },
                                     title: feed_item.content %>
  <% end %>
</li>

错误登录

    Started POST "/microposts" for 127.0.0.1 at 2012-11-24 10:20:26 -0800
Processing by MicropostsController#create as JS
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"+x5dhM0t5pZzB0flEo46n+Rr8OKcxNdgaAgvkh46dek=", "micropost"=>{"content"=>"Please work"}, "commit"=>"Post"}
  User Load (0.4ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 103 LIMIT 1
  CACHE (0.0ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 103 LIMIT 1
   (0.1ms)  BEGIN
  SQL (0.6ms)  INSERT INTO "microposts" ("content", "created_at", "updated_at", "user_id") VALUES ($1, $2, $3, $4) RETURNING "id"  [["content", "Please work"], ["created_at", Sat, 24 Nov 2012 18:20:26 UTC +00:00], ["updated_at", Sat, 24 Nov 2012 18:20:26 UTC +00:00], ["user_id", 103]]
   (1.7ms)  COMMIT
  Rendered shared/_feed.html.erb (2.2ms)
  Rendered microposts/create.js.erb (4.1ms)
Completed 500 Internal Server Error in 14ms

ActionView::Template::Error (undefined method `any?' for nil:NilClass):
    1: <% if @feed_items.any? %>
    2:   <ol class="microposts">
    3:     <%= render partial: 'shared/feed_item', collection: @feed_items %>
    4:   </ol>
  app/views/shared/_feed.html.erb:1:in `_app_views_shared__feed_html_erb___3604038303202035148_70347748984380'
  app/views/microposts/create.js.erb:1:in `_app_views_microposts_create_js_erb__2642480281700969603_70347793753860'
  app/controllers/microposts_controller.rb:8:in `create'


  Rendered /usr/local/rvm/gems/ruby-1.9.3-p286/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/_trace.erb (2.0ms)
  Rendered /usr/local/rvm/gems/ruby-1.9.3-p286/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.4ms)
  Rendered /usr/local/rvm/gems/ruby-1.9.3-p286/gems/actionpack-3.2.8/lib/action_dispatch/middleware/templates/rescues/template_error.erb within rescues/layout (11.6ms)

linkto github https://github.com/thebusiness11/appsample

错误渲染微博/微博部分

Started POST "/microposts" for 127.0.0.1 at 2012-11-24 12:23:25 -0800
Processing by MicropostsController#create as JS
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"+x5dhM0t5pZzB0flEo46n+Rr8OKcxNdgaAgvkh46dek=", "micropost"=>{"content"=>"rendering microposts/micropost partial\r\n"}, "commit"=>"Post"}
  User Load (0.7ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 103 LIMIT 1
  CACHE (0.0ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 103 LIMIT 1
   (0.2ms)  BEGIN
  SQL (5.5ms)  INSERT INTO "microposts" ("content", "created_at", "updated_at", "user_id") VALUES ($1, $2, $3, $4) RETURNING "id"  [["content", "rendering microposts/micropost partial\r\n"], ["created_at", Sat, 24 Nov 2012 20:23:25 UTC +00:00], ["updated_at", Sat, 24 Nov 2012 20:23:25 UTC +00:00], ["user_id", 103]]
   (2.2ms)  COMMIT
  Rendered microposts/_micropost.html.erb (26.8ms)
  Rendered microposts/create.js.erb (32.4ms)
Completed 500 Internal Server Error in 140ms

ActionView::Template::Error (undefined method `content' for nil:NilClass):
    1: <li>
    2:   <span class="content"><%= micropost.content %></span>
    3:   <span class="timestamp">
    4:     Posted <%= time_ago_in_words(micropost.created_at) %> ago.
    5:   </span>
  app/views/microposts/_micropost.html.erb:2:in `_app_views_microposts__micropost_html_erb__2883653912254136485_70298849712020'
  app/views/microposts/create.js.erb:1:in `_app_views_microposts_create_js_erb__910732530435705121_70298849590600'
  app/controllers/microposts_controller.rb:8:in `create'

Answer 1

您正在尝试渲染'shared / feed'，它会立即查看@feed_items实例变量，该变量未在您的创建操作中设置。你的意思是改为渲染'shared / micropost'吗？

Answer 2

所以事实证明我需要做的就是传递对象@micropost

$(".microposts").prepend("<%= escape_javascript(render(:partial => 'shared/feed_item', :object => @micropost)) %>")

让Ajax将方法传递给响应

2 个答案: