无法显示阵列中的单个图像（Rails 活动存储）

Question

我确定这应该很简单，而且我忽略了一些愚蠢的事情。

导轨 6.1.1 Ruby 3.0.0

我正在使用活动存储将多张“照片”附加到我的文章 model。

在文章“show.html.erb”中，我想将照片放置在文章中的多个不同位置，而不是将它们全部循环在同一位置。

显示.html.erb

<% @first2photos.each do |article| %>
    <%= image_tag(article.photos) %>
  <% end %>

文章.controller.erb

  def show
    @first2photos = Article.order("created_at DESC").first(2)
  end

这会出现以下错误： Can't resolve image into URL: undefined method `to_model' for #<ActiveStorage::Attached::Many:0x00007fdbbfa852a8 @name="photos", @record=#<Article id: 1, title: "This is the first post", snippet: "Hopefully this will also attach a couple of photos", body: "Nullam ac odio eget mauris accumsan malesuada. Nul...", created_at: "2021-01-30 20:50:31.766713000 +0000", updated_at: "2021-01-30 21:04:09.424224000 +0000">> Did you mean? to_yaml Can't resolve image into URL: undefined method `to_model' for #<ActiveStorage::Attached::Many:0x00007fdbbfa852a8 @name="photos", @record=#<Article id: 1, title: "This is the first post", snippet: "Hopefully this will also attach a couple of photos", body: "Nullam ac odio eget mauris accumsan malesuada. Nul...", created_at: "2021-01-30 20:50:31.766713000 +0000", updated_at: "2021-01-30 21:04:09.424224000 +0000">> Did you mean? to_yaml

如果我在“照片”上循环：

<% @first2photos.each do |photos| %>
    <%= image_tag(@article.photos) %>
  <% end %>

我仍然收到以下错误：

Can't resolve image into URL: undefined method `to_model'...

将其更改为：

<% @first2photos.each do |photos| %>
    <%= image_tag(photos) %>
  <% end %>

该页面现在加载，但显示一个损坏的图像图标，没有错误。 检查终端中的登录，我不确定我是否可以看到它试图访问照片的位置。

Started GET "/articles/1" for ::1 at 2021-01-31 20:56:58 +0000
Processing by ArticlesController#show as HTML
  Parameters: {"id"=>"1"}
  Article Load (2.9ms)  SELECT "articles".* FROM "articles" WHERE "articles"."id" = $1 LIMIT $2  [["id", 1], ["LIMIT", 1]]
  ↳ app/controllers/articles_controller.rb:64:in `set_article'
  Article Load (1.4ms)  SELECT "articles".* FROM "articles" ORDER BY created_at DESC LIMIT $1  [["LIMIT", 2]]
  ↳ app/controllers/articles_controller.rb:11:in `show'
  Rendering layout layouts/application.html.erb
  Rendering articles/show.html.erb within layouts/application
  Rendered articles/show.html.erb within layouts/application (Duration: 0.4ms | Allocations: 155)
[Webpacker] Everything's up-to-date. Nothing to do
  Rendered layout layouts/application.html.erb (Duration: 8.6ms | Allocations: 4208)
Completed 200 OK in 20ms (Views: 9.3ms | ActiveRecord: 4.4ms | Allocations: 6022)

Answer 1

您需要遍历照片集合以对每张照片使用image_tag 。

<% @first2photos.each do |article| %>
  <% article.photos.each do |photo|
    <%= image_tag(photo) %>
  <% end %>
<% end %>

如果您只想在每篇文章中显示一张图片，则：

<% @first2photos.each do |article| %>
  <%= image_tag(article.photos.first) %>
<% end %>

我会将名称first2photos更改为first2articles以减少混淆。