耙资产：预编译：Rails 4 中的 nodigest

Question

在 Rails 3 中有一个 rake assets:precompile:nodigest 任务，它正在编译资产并在 /public/assets 目录中没有摘要部分的情况下编写它们。在 Rails 4 中，这已被删除，默认情况下，所有资产都仅使用摘要进行预编译。由于各种原因，我还需要一些资产的非消化版本。有什么简单的方法可以恢复旧的行为吗？

Answer 1

Rails 4.0.0 中使用的sprockets-rails 版本不再支持非摘要资产。

每sprocket-rails's Readme:

只编译摘要文件名。静态非摘要资产应该简单地公开存在

因此，任何需要静态的资产都可以手动放入您的public 文件夹中。如果你需要复制 SCSS 文件等编译好的资产，这个 rake 任务可能会有所帮助（source）：

task non_digested: :environment do
  assets = Dir.glob(File.join(Rails.root, 'public/assets/**/*'))
  regex = /(-{1}[a-z0-9]{32}*\.{1}){1}/
  assets.each do |file|
    next if File.directory?(file) || file !~ regex

    source = file.split('/')
    source.push(source.pop.gsub(regex, '.'))

    non_digested = File.join(source)
    FileUtils.cp(file, non_digested)
  end
end

Answer 2

还有一个宝石可以为你做这件事：有点挑衅的名字non-stupid-digest-assets。

gem "non-stupid-digest-assets"

Answer 3

正如最佳答案所建议的那样，如果您不着急，我建议您先阅读该问题以充分了解背景故事。我最喜欢这个主意，https://github.com/rails/sprockets-rails/issues/49#issuecomment-24837265。

以下是我个人的看法，基本上我从上面的答案中获取了代码。就我而言，我只有 2 个我不想消化的文件，widget.js 和 widget.css。所以我使用 sprockets 方法找到摘要文件，然后将其符号链接到公用文件夹。

# config/environments/production.rb
config.assets.precompile += %w[v1/widget.js v1/widget.css]

# lib/tasks/assets.rake
namespace :assets do
  desc 'symlink digested widget-xxx.js and widget-xxx.css to widget.js and widget.css'
  task symlink_widget: :environment do
    next if Rails.env.development? || Rails.env.test?

    digested_files = []
    # e.g. /webapps/myapp/public/assets
    assets_path = File.join(Rails.root, 'public', Rails.configuration.assets.prefix)

    %w(v1/widget.js v1/widget.css).each do |asset|
      # e.g. 'v1/widget-b61b9eaaa5ef0d92bd537213138eb0c9.js'
      logical_path = Rails.application.assets.find_asset(asset).digest_path
      digested_files << File.join(assets_path, logical_path)
    end

    fingerprint_regex = /(-{1}[a-z0-9]{32}*\.{1}){1}/
    digested_files.each do |file|
      next unless file =~ fingerprint_regex

      # remove fingerprint & '/assets' from file path
      non_digested = file.gsub(fingerprint_regex, '.')
                         .gsub(Rails.configuration.assets.prefix, '')

      puts "Symlinking #{file} to #{non_digested}"
      system "ln -nfs #{file} #{non_digested}"
    end
  end
end

Answer 4

我对所有可用选项的大量分析在这里：

https://bibwild.wordpress.com/2014/10/02/non-digested-asset-names-in-rails-4-your-options/

我决定添加一个自定义 rake 任务，使用自定义配置来确定某些资产作为非消化版本生成，并使用 Sprockets 清单来查找消化后的资产并使用非消化名称复制它们。

https://github.com/team-umlaut/umlaut/blob/5edcc609389edf833a79caa6f3ef92982312f0c5/lib/tasks/umlaut_asset_compile.rake

# Rails4 doesn't create un-fingerprinted assets anymore, but we
# need a couple for umlaut's API. Let's try to hook in and make
# symlinks. 
#
# list of what file(globs) need non-digest-named copies is kept in
#     Umlaut::Engine.config.non_digest_named_assets
# defined in lib/umlaut.rb, but app can modify it if desired. 

require 'umlaut'
require 'pathname'


# Every time assets:precompile is called, trigger umlaut:create_non_digest_assets afterwards. 
Rake::Task["assets:precompile"].enhance do
  Rake::Task["umlaut:create_non_digest_assets"].invoke
end

namespace :umlaut do 

  # This seems to be basically how ordinary asset precompile
  # is logging, ugh. 
  logger = Logger.new($stderr)  

  # Based on suggestion at https://github.com/rails/sprockets-rails/issues/49#issuecomment-20535134
  # but limited to files in umlaut's namespaced asset directories. 
  task :create_non_digest_assets => :"assets:environment"  do    
    manifest_path = Dir.glob(File.join(Rails.root, 'public/assets/manifest-*.json')).first
    manifest_data = JSON.load(File.new(manifest_path))

    manifest_data["assets"].each do |logical_path, digested_path|
      logical_pathname = Pathname.new logical_path

      if Umlaut::Engine.config.non_digest_named_assets.any? {|testpath| logical_pathname.fnmatch?(testpath, File::FNM_PATHNAME) }
        full_digested_path    = File.join(Rails.root, 'public/assets', digested_path)
        full_nondigested_path = File.join(Rails.root, 'public/assets', logical_path)

        logger.info "(Umlaut) Copying to #{full_nondigested_path}"

        # Use FileUtils.copy_file with true third argument to copy
        # file attributes (eg mtime) too, as opposed to FileUtils.cp
        # Making symlnks with FileUtils.ln_s would be another option, not
        # sure if it would have unexpected issues. 
        FileUtils.copy_file full_digested_path, full_nondigested_path, true      
      end
    end

  end
end

Answer 5

谢谢 Dylan Markow，我按照他的回答，但我发现在使用 Capistrano 时有多个版本的资产（例如 application-0a*.css、application-9c*.css、...），因此 最新的应该是不消化的。这里的逻辑是：

namespace :my_app do
  task non_digested: :environment do
    assets = Dir.glob(File.join(Rails.root, 'public/assets/**/*'))
    regex = /(?<!manifest)(-{1}[a-z0-9]{32}\.{1}){1}/
    candidates = {}

    # gather files info
    assets.each do |file|
      next if File.directory?(file) || file !~ regex

      source = file.split('/')
      source.push(source.pop.gsub(regex, '.'))
      non_digested = File.join(source)
      file_mtime = File.stat(file).mtime
      c = candidates[non_digested]
      if c.blank? || file_mtime > c[:mtime]
        candidates[non_digested] = {orig: file, mtime: file_mtime}
      end
    end

    # genearate
    for non_digested, val in candidates do
      FileUtils.cp(val[:orig], non_digested)
    end
  end
end

Rake::Task['assets:precompile'].enhance do
  Rake::Task['my_app:non_digested'].invoke
end

另外，我应用了 907th 的正则表达式注释，并添加了钩子让这个任务在预编译后执行。

Answer 6

在 `development.rb' 文件中设置此属性 config.assets.digest = false