Question

嗨我正在努力添加删除嵌套对象的链接。我有列表应用程序，有许多嵌套的任务。

resources :lists do
  resource :tasks
end

我已阅读此post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：现在我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list / 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

Answer 1

您的链接应该是：

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

循环浏览@list.tasks时，您只需将task本地化为|task| - 但@list始终保持@list。

另一个问题出在你的控制器中：@task = @list.tasks.new - 你在这里建立一个新任务，这是你的表格所需要的。但是，此任务是新的，这意味着它尚未保存 - 您根本无法构建删除它的链接，因为它尚未存在于数据库中。您可以通过直接在表单中构建任务来避免这种情况，而不是在控制器中。

在控制器中摆脱这一行：

@task = @list.tasks.new

将表单更改为：

<%= form_for [@list, @list.tasks.build] do |form| %>

删除嵌套对象

1 个答案: