def _results_files(self):
     for contractor in self.project.contractor_set.all():
         if has_access(self.user, self.project, contractor):
             for path in directories.files_in(
                 directories.results_dir(self.project, contractor)):
                     yield {
                     'type': 'Resultaten {0}'.format(
                         contractor.organization.name),
                     'filename': os.path.basename(path),
                     'size': directories.human_size(path),
                     'url': self._make_url('results',
                                           self.project,
                                           contractor,
                                           path)
                     }