Question

问题是我有一个表格，通常应该渲染当前汽车的照片，但它会这样做，但它会多次渲染..像这样：我有5张照片为car_id 2而在屏幕上我有5次这些照片显示。

12345 12345 12345 12345 12445

如果我添加照片，那么它将被曝光6次。问题是什么以及如何解决它，我已经尝试了很多：替换它，替换它但没有。

以下是表单本身的一部分

<%= form_for @car, :html => { :method => :put }, :html => { :multipart => true } do |f| %>
...
...
    <% for photo in @car.uploads %>
    <div style="width:750px !important;">
          <%= f.fields_for :uploads do |photo_fields| %>
            <%unless photo_fields.object.new_record? %>
                <div style="width:150px;float:left;">
                  <%= image_tag(photo_fields.object.photo.url(:thumb)) %>
                  <p><%= photo_fields.check_box :_destroy %>  Delete item</p>
                </div>
            <% end %>
          <% end %>
      </div>  
....
...
<% end %>

和控制台：

Started GET "/cars/2/edit" for 127.0.0.1 at Sun Nov 06 22:50:17 +0200 2011
  Processing by CarsController#edit as HTML
  Parameters: {"id"=>"2"}
  User Load (0.2ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` = 1 LIMIT 1
  SQL (4.1ms)  SHOW TABLES
  Car Load (0.2ms)  SELECT `cars`.* FROM `cars` WHERE `cars`.`id` = 2 LIMIT 1
  CACHE (0.0ms)  SELECT `cars`.* FROM `cars` WHERE `cars`.`id` = 2 LIMIT 1
  Carname Load (0.2ms)  SELECT `carnames`.* FROM `carnames`
  Carmodel Load (0.2ms)  SELECT `carmodels`.* FROM `carmodels`
Rendered shared/_error_messages.html.erb (1.0ms)
  Upload Load (0.2ms)  SELECT `uploads`.* FROM `uploads` WHERE (`uploads`.car_id = 2)
  Carname Load (0.2ms)  SELECT `carnames`.* FROM `carnames` WHERE `carnames`.`id` = 1 LIMIT 1
  Carmodel Load (0.2ms)  SELECT `carmodels`.* FROM `carmodels` WHERE `carmodels`.`id` = 5 LIMIT 1
Rendered uploads/_upload.html.erb (8.1ms)
Rendered cars/_show.html.erb (2.7ms)
WARNING: Can't mass-assign protected attributes: user_id
Rendered cars/_form.html.erb (460.6ms)
Rendered welcome/_sliderempty.html.erb (1.0ms)
Rendered welcome/_footer.html.erb (0.5ms)

感谢您的时间。

Answer 1

只需删除for循环，fields_for已遍历照片，因此您需要迭代两次才能获得两次照片。

回复你的评论：尝试明确地传递集合，如：

<%= f.fields_for :uploads, @car.uploads do |photo_fields| %>

所以你走了：

<%= form_for @car, :html => { :method => :put }, :html => { :multipart => true } do |f| %>
...
...
    <div style="width:750px !important;">
          <%= f.fields_for :uploads, @car.uploads do |photo_fields| %>
            <%unless photo_fields.object.new_record? %>
                <div style="width:150px;float:left;">
                  <%= image_tag(photo_fields.object.photo.url(:thumb)) %>
                  <p><%= photo_fields.check_box :_destroy %>  Delete item</p>
                </div>
            <% end %>
          <% end %>
      </div>  
....
...
<% end %>

我在rails 3中的表单为模型渲染了多次照片

1 个答案: