ruby-on-rails - Errno::ENOENT: 功能测试后没有这样的文件或目录@rb_file_s_mtime
问题描述
运行功能 Rspecs 时，我收到以下错误（此消息底部的完整跟踪）
彪马输出
Rack app error handling request { GET /rails/active_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--db9451afdc95b292aa6a77c40e00ab0ceb687766/image.png }
#<Errno::ENOENT: No such file or directory @ rb_file_s_mtime - /path/to/rails/app/tmp/storage/va/ri/variants/Gpu41CMPPeKLiMbfpzYYyCp5/110e017d16925dc7c50728c9c154a420079aa6e5fcc435db3e6e97b1380ecec8>
(followed by the full trace at the end of this message)
Rspec 输出
Failure/Error: last_modified = ::File.mtime(path).httpdate
Errno::ENOENT:
No such file or directory @ rb_file_s_mtime - /path/to/rails/app/tmp/storage/va/ri/variants/Gpu41CMPPeKLiMbfpzYYyCp5/110e017d16925dc7c50728c9c154a420079aa6e5fcc435db3e6e97b1380ecec8
(followed by the full trace at the end of this message)
语境
product.image是一个 ActiveStorage 附件。在测试期间，“products/_form”部分被渲染并显示带有以下代码的附件文件（即 png 图像）= image_tag url_for(product.image.variant(resize: "120x120"))：. 如果我注释掉这一行，错误就不会再发生了。
测试本身每次都成功，错误似乎是在测试后触发的。我验证了我所有的after块，它似乎发生在我所有的块之后。
跟踪指示ActiveStorage::DiskController.serve_file触发错误。是不是 ActiveStorage 应用程序没有正常关闭？
我正在使用active_storage.service = :test配置，但:file给出了相同的错误。
图像损坏
虽然测试失败，但我可以在“远程控制”浏览器中看到图像没有显示，而是出现了一个损坏的图像图标。
运行测试
有一组 4 个特色测试正在渲染“products/_form”部分。当我以随机顺序运行 4 个测试时，错误随机发生。有时我可以看到错误 2 次，有时 3 次。
当我单独运行测试时，错误永远不会出现。
我如何附加图像
这是我在进行测试之前用来将文件附加到模型的助手：
path = Rails.root.join 'spec', 'support', 'fixtures', 'img1.png'
raise 'Image does not exist' unless File.exist? path
product.image.attach io: File.open(path), filename: 'image.png'
我也尝试使用这个助手：
path = Rails.root.join 'spec', 'support', 'fixtures', 'img1.png'
raise 'Image does not exist' unless File.exist? path
blob = ActiveStorage::Blob.create_after_upload! io: path.open, \
filename: 'img1.png', content_type: 'image/png'
product.images.attach blob
而这个助手：
path = Rails.root.join 'spec', 'support', 'fixtures', 'img1.png'
raise 'Image does not exist' unless File.exist? path
byte_size = path.size
checksum = Digest::MD5.file(path).base64digest
blob = ActiveStorage::Blob.create_before_direct_upload!(filename: 'img1.png', \
byte_size: byte_size, checksum: checksum, content_type: 'image/png').tap do |blob|
ActiveStorage::Blob.service.upload(blob.key, path.open)
end
product.images.attach blob
系统配置
导轨版本：5.2.2
Ruby 版本：ruby 2.5.3p105（2018-10-18 修订版 65156）[x86_64-linux]
rbenv 版本：rbenv 1.1.1-39-g59785f6
Rspec 相关版本：rspec 3.8.0 - capybara 3.12.0 - selenium-webdriver 3.141.0
完整跟踪
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/file.rb:63:in `mtime'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/file.rb:63:in `serving'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activestorage-5.2.2/app/controllers/active_storage/disk_controller.rb:42:in `serve_file'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activestorage-5.2.2/app/controllers/active_storage/disk_controller.rb:12:in `show'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/abstract_controller/base.rb:194:in `process_action'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_controller/metal/rendering.rb:30:in `process_action'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/abstract_controller/callbacks.rb:42:in `block in process_action'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/callbacks.rb:132:in `run_callbacks'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/abstract_controller/callbacks.rb:41:in `process_action'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_controller/metal/rescue.rb:22:in `process_action'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_controller/metal/instrumentation.rb:34:in `block in process_action'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/notifications.rb:168:in `block in instrument'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/notifications/instrumenter.rb:23:in `instrument'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/notifications.rb:168:in `instrument'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_controller/metal/instrumentation.rb:32:in `process_action'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_controller/metal/params_wrapper.rb:256:in `process_action'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activerecord-5.2.2/lib/active_record/railties/controller_runtime.rb:24:in `process_action'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/abstract_controller/base.rb:134:in `process'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionview-5.2.2/lib/action_view/rendering.rb:32:in `process'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_controller/metal.rb:191:in `dispatch'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_controller/metal.rb:252:in `dispatch'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/routing/route_set.rb:52:in `dispatch'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/routing/route_set.rb:34:in `serve'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/journey/router.rb:52:in `block in serve'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/journey/router.rb:35:in `each'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/journey/router.rb:35:in `serve'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/routing/route_set.rb:840:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/tempfile_reaper.rb:15:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/etag.rb:25:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/conditional_get.rb:25:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/head.rb:12:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/http/content_security_policy.rb:18:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/session/abstract/id.rb:232:in `context'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/session/abstract/id.rb:226:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/middleware/cookies.rb:670:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/callbacks.rb:98:in `run_callbacks'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/middleware/callbacks.rb:26:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/middleware/debug_exceptions.rb:61:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/rack/logger.rb:38:in `call_app'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/rack/logger.rb:26:in `block in call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/tagged_logging.rb:71:in `block in tagged'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/tagged_logging.rb:28:in `tagged'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/tagged_logging.rb:71:in `tagged'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/rack/logger.rb:26:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/middleware/request_id.rb:27:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/method_override.rb:22:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/runtime.rb:22:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/activesupport-5.2.2/lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/middleware/executor.rb:14:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/actionpack-5.2.2/lib/action_dispatch/middleware/static.rb:127:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/sendfile.rb:111:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/railties-5.2.2/lib/rails/engine.rb:524:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/urlmap.rb:68:in `block in call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/urlmap.rb:53:in `each'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/rack-2.0.6/lib/rack/urlmap.rb:53:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/capybara-3.12.0/lib/capybara/server/middleware.rb:48:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/puma-3.12.0/lib/puma/configuration.rb:225:in `call'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/puma-3.12.0/lib/puma/server.rb:658:in `handle_request'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/puma-3.12.0/lib/puma/server.rb:472:in `process_client'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/puma-3.12.0/lib/puma/server.rb:332:in `block in run'
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/puma-3.12.0/lib/puma/thread_pool.rb:133:in `block in spawn_thread'
#
# Showing full backtrace because every line was filtered out.
# See docs for RSpec::Configuration#backtrace_exclusion_patterns and
# RSpec::Configuration#backtrace_inclusion_patterns for more information.
# ------------------
# --- Caused by: ---
# Capybara::CapybaraError:
# Your application server raised an error - It has been raised in your test code because Capybara.raise_server_errors == true
# /opt/rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/capybara-3.12.0/lib/capybara/session.rb:147:in `raise_server_error!'
更新
（对不起，我有急事要处理）
这是一个有趣的信息。我在这一行之后插入了这段代码：puts "SERVING #{path} - Exist ? #{File.exist? path}"
这是输出（观察每行末尾的文件名和布尔值）：
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/Me/GK/MeGKkqgbb7Sg4RbPoCYWR6pZ - Exist ? true
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/sG/3v/sG3vd2viGWmaf69pNXSChZPa - Exist ? true
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/fy/2C/fy2C8PpaR96YgCzwt5WVBLrQ - Exist ? true
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/sG/3v/sG3vd2viGWmaf69pNXSChZPa - Exist ? true
. (green dot)
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/Me/GK/MeGKkqgbb7Sg4RbPoCYWR6pZ - Exist ? false
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/sG/3v/sG3vd2viGWmaf69pNXSChZPa - Exist ? false
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/Me/GK/MeGKkqgbb7Sg4RbPoCYWR6pZ - Exist ? false
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/fy/2C/fy2C8PpaR96YgCzwt5WVBLrQ - Exist ? false
F (red F)
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/Me/GK/MeGKkqgbb7Sg4RbPoCYWR6pZ - Exist ? false
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/sG/3v/sG3vd2viGWmaf69pNXSChZPa - Exist ? false
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/Me/GK/MeGKkqgbb7Sg4RbPoCYWR6pZ - Exist ? false
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/fy/2C/fy2C8PpaR96YgCzwt5WVBLrQ - Exist ? false
F (red F)
SERVING /tmp/active_storage_tests20190129-10797-1rebdf7/Tx/DL/TxDLPEk3ykf8ETkURY5YZPgY - Exist ? true
我们可以看到文件路径是相同的，即使在测试之间也是如此。在每次测试之间清理数据库。因此，文件校验和保存在“某处”，以便 activestorage 重用相同的 blob 记录。结果它重用了相同的文件路径，这就是我有 FileNotFound 错误的原因。
任何想法 ？请注意，除了 DatabaseCleaner 之外，我还有一个如下定义的 after 块：
config.after(:each) do
ActiveStorage::Current.reset
ActiveStorage::Attachment.all.each(&:delete)
ActiveStorage::Blob.all.each(&:delete)
end
我怀疑一个错误
用应用程序填充 PR 以重现https://github.com/rails/rails/issues/34989
等待他们的回应
解决方案
测试通过的事实仅仅意味着测试不依赖于找到的图像。损坏的图像链接通常不会导致测试失败，实际上测试编写者通常甚至不费心提供模拟图像，因为它（被认为是）太多工作并且与被测试的事物无关.
见人，这就是为什么我们要求一个例子。现在OP已经发布了一个例子，我们可以看到他的问题是浏览器缓存，将通过替换来解决
product.images.attach io: File.open(path), filename: 'image.png'
和
product.images.attach io: File.open(path), filename: "image-#{Time.now.strftime("%s%L")}.png"
在执行附件的助手中。如果没有这个例子，我就不会解决这个问题。
解释
ActiveStorage 处理保存和提供文件。OP 用它来保存和提供图像，这绝对是它的目的。为了允许不同的服务以不同的方式提供文件，ActiveStorage 将发布的 URL 与实际的图像服务 URL 分开。
发布的 URL 几乎是一个永久链接：它是附件数据库密钥的编码版本。ActiveStorage 通过查找文件的存储位置并将 302 临时重定向发送到可用于访问文件的 URL（称为“服务 URL”）来处理对 URL 的请求。当使用 AWS S3 存储文件时，服务 URL 可以是一个签名的 URL，它很快就会过期，但仍然可以将浏览器直接连接到 S3，而不必通过 Web 服务器作为中介。
默认情况下，服务 URL 5 分钟有效，ActiveRecord 显式设置
Cache-Control: max-age=300, private
关于 302 重定向。浏览器缓存此重定向响应，在接下来的 5 分钟内，浏览器甚至不会尝试使用或验证已发布的 URL，它会立即将公共 URL 替换为缓存的服务 URL。
不幸的是，虽然公共 URL 可以预见地重新创建，但服务 URL 是随机生成的，因此当浏览器进行自动重定向时，之前有效的服务 URL 不再有效。解决方案（或解决方法，取决于您的观点）是通过在文件名中包含时间戳来区分公共 URL，以便测试不会重用公共 URL。
边注
顺便说一句，你不应该使用url_forwith image_tag。将您的 ERB 从
= image_tag url_for(product.image.variant(resize: "120x120"))
至
= image_tag(product.image.variant(resize: "120x120"))
Rails 足够聪明，可以处理这两种情况，但推荐使用后一种方法。
推荐阅读
- c++ - 编译器通过将数组传输到函数给我一个错误
- python - Python 和 SAS 生成具有相同绝对值的 PCA 数据。值但倒置符号 - 为什么？
- google-apps-script - 基于另一个工作表中的选项的带有条件下拉列表的电子表格
- java - ParDo 函数不等待 Apache BEAM 中的窗口
- javascript - 查找所有满足测试功能的对象索引，如 array.findIndex() 但超过第一个索引
- java - 使用 FirebaseRecyclerAdapter 从 Firebase 实时数据库中检索数据到 Recycler View
- android - Webview 不显示全文
- c - 使用 malloc，并将分配的内存中的内容传输到文件
- python - 更新kivy上的标签
- python - Python 3：用于排序任意对象的模式（例如，Python 2 样式排序）？