class ActiveSupport::Cache::Store

def delete(name, options = nil)

Options are passed to the underlying cache implementation.

and +false+ otherwise.
Deletes an entry in the cache. Returns +true+ if an entry is deleted 
def delete(name, options = nil)
  options = merged_options(options)
  instrument(:delete, name) do
    delete_entry(normalize_key(name, options), **options)
  end
end