stale?(record_or_options, additional_options = {})
Instance Public methods
Sets the etag
and/or last_modified
on the
response and checks it against the client request. If the request
doesn't match the options provided, the request is considered stale and
should be generated from scratch. Otherwise, it's fresh and we
don't need to generate anything and a reply of 304 Not
Modified
is sent.
Parameters:
-
:etag
. -
:last_modified
. -
:public
By default the Cache-Control header is private, set this totrue
if you want your application to be cachable by other devices (proxy caches).
Example:
def show @article = Article.find(params[:id]) if stale?(etag: @article, last_modified: @article.created_at) @statistics = @article.really_expensive_call respond_to do |format| # all the supported formats end end end
You can also just pass a record where last_modified
will be
set by calling updated_at and the etag by passing the object itself.
def show @article = Article.find(params[:id]) if stale?(@article) @statistics = @article.really_expensive_call respond_to do |format| # all the supported formats end end end
When passing a record, you can still set whether the public header:
def show @article = Article.find(params[:id]) if stale?(@article, public: true) @statistics = @article.really_expensive_call respond_to do |format| # all the supported formats end end end
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