Ruby-on-rails Rails.cache.clear 和 rake tmp:cache:clear 有什么区别？
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What is the difference between Rails.cache.clear and rake tmp:cache:clear?
提问by Crashalot
Are the two commands equivalent? If not, what's the difference?
这两个命令是等价的吗？如果不是，有什么区别？
回答by Jeremy Green
The rake task only clears out files that are stored on the filesystem in "#{Rails.root}/tmp/cache". Here's the code for that task.
rake 任务只清除存储在"#{Rails.root}/tmp/cache". 这是该任务的代码。
namespace :cache do
# desc "Clears all files and directories in tmp/cache"
task :clear do
FileUtils.rm_rf(Dir['tmp/cache/[^.]*'])
end
end
Rails.cache.clearwill do different things depending on your apps setting for config.cache_store. http://guides.rubyonrails.org/caching_with_rails.html#cache-stores
Rails.cache.clear将根据您的应用程序设置做不同的事情config.cache_store。 http://guides.rubyonrails.org/caching_with_rails.html#cache-stores
If you are using config.cache_store = :file_storethen Rails.cache.clearwill be functionally identical to rake tmp:cache:clear. However, if you're using some other cache_store, like :memory_storeor :mem_cache_store, then only Rails.cache.clearwill clear your app cache. In that case rake tmp:cache:clearwill just try to remove files from "#{Rails.root}/tmp/cache"but probably won't actually do anything since nothing is probably being cached on the filesystem.
如果您正在使用config.cache_store = :file_storethenRails.cache.clear将在功能上与rake tmp:cache:clear. 但是，如果您使用其他一些cache_store，例如:memory_store或:mem_cache_store，则只会Rails.cache.clear清除您的应用程序缓存。在这种情况下，rake tmp:cache:clear只会尝试从中删除文件，"#{Rails.root}/tmp/cache"但实际上可能不会执行任何操作，因为文件系统上可能没有缓存任何内容。
