How to clear Sprockets cache?

Question

When a Sprockets object compilation fails (due to a syntax error in CoffeeScript or SASS), it cannot recompile after the error is fixed because it says \"file is already req

Answer 1

It should be:

Rails.application.assets.cache.clear

but this method only in master branch and not even in beta.

Update: added in 4.0.0.beta5.