铁轨：多文件上传产生一个空的条目

Question

我正在尝试创建某种嵌套的文件上传。我有图像和专辑，它们通过模型蛋白映像相关。图像可以成为专辑的一部分。上传是通过载波进行的。

我希望能够以两种方式上传图像：

1. 直接通过图像
2. 通过相册

通过相册上传，应该将它们上传并插入图像和蛋白映像表中。

我可以通过图像上传单个图像，但令我惊讶的是，我当前的实现通过相册上传多个图像会导致2个单独的数据输入。 （这曾经在铁轨下工作3）第一个条目是空的，第二个是我的目标。

Started PATCH "/admin/albums/38" for ::1 at 2022-05-20 11:18:44 +0200
Processing by Admin::AlbumsController#update as HTML
  Parameters: {"authenticity_token"=>"[FILTERED]", "album"=>{"images_attributes"=>[{"file_name"=>""}, {"file_name"=>#<ActionDispatch::Http::UploadedFile:0x00007f8f75185c70 @tempfile=#<Tempfile:/var/folders/yg/pfjwzpkx5wq9d27svk760h0h0000gn/T/RackMultipart20220520-19476-kto7za.jpg>, @original_filename="some-image.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"album[images_attributes][][file_name]\"; filename=\"some-image.jpg\"\r\nContent-Type: image/jpeg\r\n">, "author"=>"Some Author", "copyright"=>"Someone", "funds_ids"=>["1", "6"]}]}, "commit"=>"Save", "id"=>"38"}
  Admin Load (0.3ms)  SELECT `admins`.* FROM `admins` WHERE `admins`.`id` = 1 ORDER BY `admins`.`id` ASC LIMIT 1
  Album Load (0.2ms)  SELECT `albums`.* FROM `albums` WHERE `albums`.`id` = 38 LIMIT 1
  ↳ app/controllers/admin/albums_controller.rb:39:in `update'
  TRANSACTION (0.2ms)  BEGIN
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
  Fund Load (0.5ms)  SELECT `funds`.* FROM `funds` WHERE `funds`.`id` IN (1, 6)
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
  Section Load (0.3ms)  SELECT `sections`.* FROM `sections` WHERE `sections`.`id` = 5 LIMIT 1
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
  Fund Exists? (0.3ms)  SELECT 1 AS one FROM `funds` WHERE `funds`.`name` = 'SomeFundA' AND `funds`.`id` != 1 LIMIT 1
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
  Fund Exists? (0.2ms)  SELECT 1 AS one FROM `funds` WHERE `funds`.`name` = 'SomeFundB' AND `funds`.`id` != 6 LIMIT 1
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
  Album Exists? (0.2ms)  SELECT 1 AS one FROM `albums` WHERE `albums`.`title` = 'SomeAlbum' AND `albums`.`id` != 38 LIMIT 1
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
  Image Create (41.2ms)  INSERT INTO `images` (`file_name`, `title`, `alt`, `author`, `copyright`, `created_at`, `updated_at`) VALUES (NULL, NULL, NULL, NULL, NULL, '2022-05-20 09:18:46', '2022-05-20 09:18:46')
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
  AlbumImage Create (0.2ms)  INSERT INTO `album_images` (`album_id`, `image_id`, `created_at`, `updated_at`) VALUES (38, 231, '2022-05-20 09:18:46', '2022-05-20 09:18:46')
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
  Image Create (0.3ms)  INSERT INTO `images` (`file_name`, `title`, `alt`, `author`, `copyright`, `created_at`, `updated_at`) VALUES ('some-image.jpg', NULL, NULL, 'Some Author', 'SomeCopyRight', '2022-05-20 09:18:46', '2022-05-20 09:18:46')
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
  ImageFund Create (0.3ms)  INSERT INTO `image_funds` (`image_id`, `fund_id`, `created_at`, `updated_at`) VALUES (232, 1, '2022-05-20 09:18:46', '2022-05-20 09:18:46')
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
  ImageFund Create (0.2ms)  INSERT INTO `image_funds` (`image_id`, `fund_id`, `created_at`, `updated_at`) VALUES (232, 6, '2022-05-20 09:18:46', '2022-05-20 09:18:46')
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
  AlbumImage Create (0.3ms)  INSERT INTO `album_images` (`album_id`, `image_id`, `created_at`, `updated_at`) VALUES (38, 232, '2022-05-20 09:18:46', '2022-05-20 09:18:46')
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
  TRANSACTION (3.1ms)  COMMIT
  ↳ app/controllers/admin/albums_controller.rb:40:in `update'
Redirected to http://localhost:3000/admin/albums/38
Completed 302 Found in 2136ms (ActiveRecord: 52.4ms | Allocations: 46882)

这是我的形式：

<%= form_for [:admin, @album], html: {role: 'form' } do |f| %>
  <%= render 'shared/error_messages', object: f.object %>
  <%= f.fields_for :images, Image.new do |ff| %>
    <div class='form-data'>
      <%= ff.label :file_name, class: 'form-label' %>
      <%= ff.file_field :file_name, multiple: :true, name: "album[images_attributes][][file_name]", class: 'form-field' %>
    </div>
    <div class="form-data">
      <%= ff.label :author, class: "form-label" %>
      <%= ff.text_field :author, name: "album[images_attributes][][author]", class: "form-field" %>
    </div>
    <div class="form-data">
      <%= ff.label :copyright, class: "form-label" %>
      <%= ff.text_field :copyright, name: "album[images_attributes][][copyright]", class: "form-field" %>
    </div>
    <div class="form-data">
      <%= ff.label :fund, class: "form-label" %>
      <% Fund.all.each do |fund| %>
        <%= check_box_tag "album[images_attributes][][funds_ids][]", fund.id, ff.object.funds.include?(fund), class: "checkbox" %>
        <%= fund.name %>
      <% end %>
    </div>
  <% end %>
  <div class='actions create'>
    <%= f.submit 'Save' %>
  </div>
<% end %>

为什么images_attributes获得两个元素的数组，而不仅仅是一个元素？

我希望有人可以把我朝正确的方向发展。非常感谢您！

在专辑控制器中，我为图像设置了允许的参数： 私人的

def album_params
  params.require(:album).permit(:title, :section_id, images_attributes: [:alt, :author, :copyright, :file_name, :title, funds_ids: []])
end

Answer 1

tldr;在 config/application.rb 中设置此，它将解决您的所有文件字段问题。

config.active_storage.multiple_file_field_include_hidden = false
# or this, but beware of load order, you can probably put this in an initializer ( untested)
 ActionView::Helpers::FormHelper.multiple_file_field_include_hidden = false 

在Rails 7上，新的配置选项已在 ActionView :: helpers :: formhelper

默认情况下，它的false。它已被用于#field_field

However, ActiveStorage in rails 7 overrides it to true

因此，代码> include_hidden：false 在所有文件字段上，尤其是如果您有一个大应用程序，则可以在ActivEstorage Config上或直接在FormHelper类上设置此 mattr_accessor 。

Answer 2

我能够运行它。我需要在File_field中设置 inclage_hidden：false ，

<%= image.file_field :file_name, include_hidden: false, multiple: :true, name: "album[images_attributes][][file_name]", class: 'form-field' %>

然后更新导轨和载体波，用于无需此选项就可以使用。