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嗨，我正在努力添加链接以删除嵌套的对象。我有许多像这样嵌套的任务的列表应用程序。

resources :lists do
  resource :tasks
end

我已经阅读了这篇文章，但它对我不起作用。我想在下面的代码中删除一个链接

    <h4>Tasks</h4>
<% @list.tasks.each do |task| %>
    <%= task.desc %>
    <%= link_to "Delete", list_task_path(list, task), :method => :delete %><br />
<% end %>

但它给了我以下错误

undefined local variable or method `list' for #<#<Class:0x007f9adc555db0>:0x007f9adc547828>

编辑：现在刷新页面时出现以下错误

No route matches {:action=>"show", :controller=>"tasks", :list_id=>#<List id: 28, name: "Julklappar", user_id: 1, created_at: "2012-12-22 17:40:05", updated_at: "2012-12-22 17:40:05">, :id=>#<Task id: nil, desc: nil, completed: false, list_id: 28, created_at: nil, updated_at: nil>}

耙路线：

pierre@ubuntu:~/todolist$ rake routes
              list_tasks GET    /lists/:list_id/tasks(.:format)          tasks#index
                         POST   /lists/:list_id/tasks(.:format)          tasks#create
           new_list_task GET    /lists/:list_id/tasks/new(.:format)      tasks#new
          edit_list_task GET    /lists/:list_id/tasks/:id/edit(.:format) tasks#edit
               list_task GET    /lists/:list_id/tasks/:id(.:format)      tasks#show
                         PUT    /lists/:list_id/tasks/:id(.:format)      tasks#update
                         DELETE /lists/:list_id/tasks/:id(.:format)      tasks#destroy
                   lists GET    /lists(.:format)                         lists#index
                         POST   /lists(.:format)                         lists#create
                new_list GET    /lists/new(.:format)                     lists#new
               edit_list GET    /lists/:id/edit(.:format)                lists#edit
                    list GET    /lists/:id(.:format)                     lists#show
                         PUT    /lists/:id(.:format)                     lists#update
                         DELETE /lists/:id(.:format)                     lists#destroy
        new_user_session GET    /users/sign_in(.:format)                 devise/sessions#new
            user_session POST   /users/sign_in(.:format)                 devise/sessions#create
    destroy_user_session DELETE /users/sign_out(.:format)                devise/sessions#destroy
           user_password POST   /users/password(.:format)                devise/passwords#create
       new_user_password GET    /users/password/new(.:format)            devise/passwords#new
      edit_user_password GET    /users/password/edit(.:format)           devise/passwords#edit
                         PUT    /users/password(.:format)                devise/passwords#update
cancel_user_registration GET    /users/cancel(.:format)                  devise/registrations#cancel
       user_registration POST   /users(.:format)                         devise/registrations#create
   new_user_registration GET    /users/register(.:format)                devise/registrations#new
  edit_user_registration GET    /users/edit(.:format)                    devise/registrations#edit
                         PUT    /users(.:format)                         devise/registrations#update
                         DELETE /users(.:format)                         devise/registrations#destroy
                    root        /                                        lists#index

编辑 #2 这是我的列表/show.html.erb 文件

<p id="notice"><%= notice %></p>

<h2><%= @list.name %></h2>

    <h4>Tasks</h4>
    <% @list.tasks.each do |task| %>
        <%= task.desc %>
        <%= link_to "Delete", list_task_path(@list, task), :method => :delete %>
    <% end %>

<%= form_for [@list, @task] do |form| %>

    <p><%= form.text_field :desc %> <%= form.submit %></p>

<% end %>

<%= link_to 'Edit', edit_list_path(@list) %> |
<%= link_to 'Back', lists_path %>

列出控制器

  def show
    @list = current_user.lists.find(params[:id])
    @task = @list.tasks.new
  end
4

1 回答 1

1

您的链接应该是：

<%= link_to "Delete", list_task_path(@list, task), :method => :delete %>

循环时@list.tasks，您只是task通过本地化|task|- 但@list始终保持不变@list。

另一个问题出在您的控制器中：@task = @list.tasks.new-您在此处构建了一个新任务，这是您的表单所必需的。然而，这个任务是新的，这意味着它还没有被保存——你根本无法建立一个链接来删除它，因为它在数据库中还不存在。您可以通过直接在表单中而不是在控制器中构建任务来避免这种情况。

摆脱控制器中的这一行：

@task = @list.tasks.new

并将您的表格更改为：

<%= form_for [@list, @list.tasks.build] do |form| %>
于 2013-01-13T20:16:17.087 回答