在Rails 3.1 on Production(Heroku)中显示为空白的图像

Question

我最近将我的Rails更新为3.1.

这是我添加的部分:

<%= asset_path('logo_symbol.png') %>

这使得/assets/logo_symbol.png它在开发环境中完美地工作.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assets/logo_symbol-135ddc8db2c9b59f032bed7db520137a.png在生产中访问网址时,我看到一个空白页面,但是当我将该网址更改为任意内容时,例如向其添加数字时,它会显示未找到的网页.很明显,它正在那个网址上找到一些东西.当我/assets/logo_symbol.png直接进入production/heroku 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的文档说明目前没有针对该问题的解决方法.

任何帮助都将非常感谢.

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

Answer 1

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响应中不包含任何正文(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,因此这不起作用.

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.