我最近更新了我的Rails到3.1.
我在这里添加了:
<%= asset_path('logo_symbol.png') %>
这使/assets/logo_symbol.png在开发环境中工作得非常好。然而，当我将代码推送到heroku上的生产环境时，它显示了一个破碎的图像，url为:assets/logo_symbol-135ddc8db2c9b59f032bed7db520137a.png。我猜这个新名字是为了一些优化的原因。
然而，有趣的是要注意，当我去生产上的assets/logo_symbol-135ddc8db2c9b59f032bed7db520137a.png url时，我看到一个空白页面，但是当我将该url更改为任何随机的东西时，比如向它添加数字，它显示一个未找到的页面。很明显，它在那个url上找到了一些东西。当我直接在production/heroku上转到/assets/logo_symbol.png时，它也显示了一个空白页。
如果这对你有帮助的话，当我推送代码时，heroku没有成功预编译，heroku的文档说目前没有解决这个问题的方法。
我猜它与一些与环境相关的配置有关。我附上了我的申请内容。rb、发展。Rb和生产。rb文件
这是我的生产内容。rb文件
# 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
，这是我的开发内容。rb文件
# 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
# 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
我比较了我的配置文件与3.1的rails文档，似乎我有所有需要的默认值。然而，我仍然没有看到图像。如有任何帮助，不胜感激
从production.rb中删除这一行:
<>之前config.action_dispatch。x_sendfile_header = "X-Sendfile"之前你还应该将配置文件中的设置与管道指南第9节中的设置对齐。
Sendfile头包含上游web服务器在哪里找到文件(在文件系统上)以提供服务的信息。这将从后端(Rails/链轮)删除负载。当sendfile在HTTP上时，响应不包含正文(它是零长度)，这就是为什么你什么也看不到的原因。
在heroku上，nginx服务器没有访问应用程序文件系统的权限，所以这行不通。
见Heroku开发站点re sendfile.
如果你正在使用heroku，本文档概述了有效使用管道的最佳选项。
您需要做两件事来解决它。首先，在生产环境中将这两行从false更改为true。rb文件。
config.assets.compile = true
config.assets.digest = true
background: url("imgo.jpg")
改为
background: image-url("image.jpg")
我希望它能起到你的作用。