[英]What is the difference between Rails.cache.clear and rake tmp:cache:clear?
Are the two commands equivalent? 这两个命令是否等效? If not, what's the difference? 如果没有,有什么区别?
The rake task only clears out files that are stored on the filesystem in "#{Rails.root}/tmp/cache"
. rake任务仅清除"#{Rails.root}/tmp/cache"
中存储在文件系统中的文件。 Here's the code for that task. 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
https://github.com/rails/rails/blob/ef5d85709d346e55827e88f53430a2cbe1e5fb9e/railties/lib/rails/tasks/tmp.rake#L25-L30 https://github.com/rails/rails/blob/ef5d85709d346e55827e88f53430a2cbe1e5fb9e/railties/lib/rails/tasks/tmp.rake#L25-L30
Rails.cache.clear
will do different things depending on your apps setting for config.cache_store
. Rails.cache.clear
将根据您的config.cache_store
应用程序设置执行不同的操作。 http://guides.rubyonrails.org/caching_with_rails.html#cache-stores http://guides.rubyonrails.org/caching_with_rails.html#cache-stores
If you are using config.cache_store = :file_store
then Rails.cache.clear
will be functionally identical to rake tmp:cache:clear
. 如果您使用config.cache_store = :file_store
则Rails.cache.clear
在功能上将与rake tmp:cache:clear
。 However, if you're using some other cache_store
, like :memory_store
or :mem_cache_store
, then only Rails.cache.clear
will clear your app cache. 但是,如果您使用其他其他cache_store
,例如:memory_store
或:mem_cache_store
,则只有Rails.cache.clear
会清除您的应用程序缓存。 In that case rake tmp:cache:clear
will 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. 在那种情况下, rake tmp:cache:clear
只会尝试从"#{Rails.root}/tmp/cache"
删除文件,但实际上可能不会做任何事情,因为文件系统上可能没有缓存。
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