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嗨，我正在使用 Rails 4rc1。真的想不通，为什么在我的文件中没有@feed.id识别出来。feeds.js谢谢帮助。

NoMethodError in Feeds#index
Showing myapp/app/views/layouts/application.haml where line #6 raised:

undefined method `id' for nil:NilClass
(in myapp/app/assets/javascripts/feeds.js.coffee.erb)

# 应用程序.haml

%head
  %title Rails4Bootstrap
  = stylesheet_link_tag "application", media: "all", "data-turbolinks-track" => true
  = javascript_include_tag "application", "data-turbolinks-track" => true
  = csrf_meta_tags
%body

# feeds_controller.rb

def index
@feeds = Feed.all
@feed = Feed.new

respond_to do |format|
  format.html # show.html.erb
  format.json { render json: @feeds }
  format.js
end
end

def destroy
  @feed = Feed.find(params[:id])
  @feed.destroy
  respond_to do |format|
    format.html { redirect_to feeds_path, notice: "Feed successfully deleted." }
    format.json { head :no_content }
    format.js
  end
end

# 视图/提要/index.haml

= form_for(@feed, remote: true) do |f|
  .field
    = f.label :url
    %br/
    = f.text_field :url
  .actions
    = f.submit


- @feeds.each do |feed|
  #feed{"data-id" => feed.id}
  ....
    = link_to 'Delete', feed, method: :delete, remote: true

# assets/javascripts/feeds.js.coffee.erb

$('#feed_<%= @feed.id %>').fadeOut

应用程序跟踪：

app/assets/javascripts/feeds.js.coffee.erb:27:in `block in singleton class' app/assets/javascripts/feeds.js.coffee.erb:-5:in `instance_eval' app/assets/javascripts/feeds.js.coffee.erb:-5:in `singleton class' app/assets/javascripts/feeds.js.coffee.erb:-7:in `__tilt_70104733785500' app/views/layouts/application.haml:6:in `_app_views_layouts_application_haml__4512126609701308533_70104706177220' app/controllers/feeds_controller.rb:28:in `index'

4

1 回答 1

1

根据经验，我从不将脚本作为 ajax 响应返回。相反，我返回 json 对象。这样javascript就可以检查json并在你的情况下为fadeOut获取正确的id。你最好这样做。它还使您的应用程序更加安静，并允许您将 JS 保留在资产中。在您的情况下，您从不知道控制器中任何 ivars 的资产加载脚本。这就是为什么你得到你的错误。@feed 永远不会在此范围内设置。

于 2013-05-29T01:09:38.103 回答