Method not available on this version
This method is only available on newer versions.
The first available version (v8.1.1) is shown here.
namespace=(namespace)
public
Set the current namespace. Note, this
will be ignored if custom options are passed to cache wills with a namespace key.
# File activesupport/lib/active_support/cache.rb, line 806
def namespace=(namespace)
@options[:namespace] = namespace
end