无法显示阵列中的单个图像（Rails 活动存储）

Question

我相信这应该很简单，但我忽略了一些愚蠢的事情。

Rails6.1.1 Ruby3.0.0

我正在使用活动存储将多个 'photos' 附加到我的文章模型。

在文章中 'show.html.erb' 我想将照片放在文章中的多个不同位置，而不是在同一位置连续循环所有照片。

show.html.erb

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

articles.controller.erb

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

这给出了以下错误： 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

如果我循环使用“照片”：

<% @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 %>

页面现已加载，但显示损坏的图像图标，没有错误。检查终端中的日志，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" =  LIMIT   [["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   [["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

您需要遍历照片集才能对每张照片使用 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。

无法显示阵列中的单个图像（Rails 活动存储）

Trouble displaying individual images from array (Rails active storage)

ruby-on-rails

rails-activestorage