在生产（Heroku）的Rails 3.1中显示为空白的图像
我最近将我的Rails更新为3.1。
这是我添加的部分：
这使得/assets/logo_symbol.png呈现在开发环境中完美无缺。 但是，当我将代码推送到heroku上的生产时，它会显示一个损坏的图像，其中包含url： assets/logo_symbol-135ddc8db2c9b59f032bed7db520137a.png 。 我猜这个新名字是出于一些优化的原因。
然而，值得注意的是，当我在生产中转到assets/logo_symbol-135ddc8db2c9b59f032bed7db520137a.pngurl时，我看到一个空白页面，但是当我将该url更改为任意内容时，例如向其添加数字时，它会显示一个页面而不是找到。 很明显，它正在那个url上找到一些东西。 当我直接在production / heroku上访问/assets/logo_symbol.png时，它还会显示一个空白页面。
如果这是任何帮助，heroku不会在我推送代码时成功预编译，并且heroku的文档说当前没有解决该问题的方法。
任何帮助将非常感谢。
我的猜测是它与某些与环境相关的配置有关。 我附上了我的application.rb，development.rb和production.rb文件的内容
这是我的production.rb文件的内容
# Settings specified here will take precedence over those in config/application.rb # In the development environment your application's code is reloaded on # every request. This slows down response time but is perfect for development # since you don't have to restart the webserver when you make code changes. config.cache_classes = false # Log error messages when you accidentally call methods on nil. config.whiny_nils = true # Show full error reports and disable caching config.consider_all_requests_local = true config.action_controller.perform_caching = false # Don't care if the mailer can't send #config.action_mailer.default_url_options = { :host => 'localhost:3000' } #config.action_mailer.default_url_options = { :host => 'localhost:3000' } config.action_mailer.delivery_method = :smtp # Print deprecation notices to the Rails logger config.active_support.deprecation = :log # Only use best-standards-support built into browsers config.action_dispatch.best_standards_support = :builtin # Do not compress assets config.assets.compress = false # Expands the lines which load the assets config.assets.debug = true end module ActiveAdmin class Reloader def attach! end end end
这是我的development.rb文件的内容
# Settings specified here will take precedence over those in config/application.rb # In the development environment your application's code is reloaded on # every request. This slows down response time but is perfect for development # since you don't have to restart the webserver when you make code changes. config.cache_classes = false # Log error messages when you accidentally call methods on nil. config.whiny_nils = true # Show full error reports and disable caching config.consider_all_requests_local = true config.action_controller.perform_caching = false # Don't care if the mailer can't send #config.action_mailer.default_url_options = { :host => 'localhost:3000' } #config.action_mailer.default_url_options = { :host => 'localhost:3000' } config.action_mailer.delivery_method = :smtp # Print deprecation notices to the Rails logger config.active_support.deprecation = :log # Only use best-standards-support built into browsers config.action_dispatch.best_standards_support = :builtin # Do not compress assets config.assets.compress = false # Expands the lines which load the assets config.assets.debug = true end module ActiveAdmin class Reloader def attach! end end end
以下是我的production.rb文件的内容
# Settings specified here will take precedence over those in config/application.rb # The production environment is meant for finished, "live" apps. # Code is not reloaded between requests config.cache_classes = true # Full error reports are disabled and caching is turned on config.consider_all_requests_local = false config.action_controller.perform_caching = true # Specifies the header that your server uses for sending files config.action_dispatch.x_sendfile_header = "X-Sendfile" # For nginx: # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # If you have no front-end server that supports something like X-Sendfile, # just comment this out and Rails will serve the files # See everything in the log (default is :info) # config.log_level = :debug # Use a different logger for distributed setups # config.logger = SyslogLogger.new # Use a different cache store in production # config.cache_store = :mem_cache_store # Disable Rails's static asset server # In production, Apache or nginx will already do this config.serve_static_assets = false # Enable serving of images, stylesheets, and javascripts from an asset server # config.action_controller.asset_host = "http://assets.example.com" # Disable delivery errors, bad email addresses will be ignored # config.action_mailer.raise_delivery_errors = false #config.action_mailer.default_url_options = { :host => 'ha1.heroku.com' } config.action_mailer.delivery_method = :smtp # Enable threaded mode # config.threadsafe! # Enable locale fallbacks for I18n (makes lookups for any locale fall back to # the I18n.default_locale when a translation can not be found) config.i18n.fallbacks = true # Send deprecation notices to registered listeners config.active_support.deprecation = :notify # Compress JavaScripts and CSS #config.assets.compress = true # Don't fallback to assets pipeline if a precompiled asset is missed config.assets.compile = false # Generate digests for assets URLs config.assets.digest = true # Defaults to Rails.root.join("public/assets") # config.assets.manifest = YOUR_PATH config.assets.js_compressor = :uglifier config.assets.css_compressor = :scss
我已经将配置文件与3.1的rails文档进行了比较，看起来我已经拥有了所有需要的默认值。 但是我仍然没有看到任何形象。 任何帮助都感激不尽
从production.rb中删除此行：
config.action_dispatch.x_sendfile_header =“X-Sendfile”
您还应该将配置文件中的设置与管道指南的第9部分中的设置对齐。
Sendfile头包含上游Web服务器的信息，用于在何处查找文件（在文件系统上）以便为其提供服务。 这将从后端（Rails / Sprockets）中移除负载。 当sendfile打开时，HTTP响应不包含任何主体（它是零长度），这就是为什么你什么也看不见。
在heroku上，nginx服务器无法访问应用程序文件系统，因此无法使用。
请参阅Heroku dev site re sendfile上的这个注释 。
如果您使用的是heroku， 本文档概述了有效使用管道的最佳选择。
你需要做两件事来解决它。 首先，在production.rb文件中将这两行从false更改为true。
config.assets.compile = true config.assets.digest = true
其次，如果你的图像有这样的语法
background: url("imgo.jpg")
将其更改为
background: image-url("image.jpg")
我希望它能完成你的工作。