formsets.py 文件源码

def deleted_forms(self):
        """
        Returns a list of forms that have been marked for deletion.
        """
        if not self.is_valid() or not self.can_delete:
            return []
        # construct _deleted_form_indexes which is just a list of form indexes
        # that have had their deletion widget set to True
        if not hasattr(self, '_deleted_form_indexes'):
            self._deleted_form_indexes = []
            for i in range(0, self.total_form_count()):
                form = self.forms[i]
                # if this is an extra form and hasn't changed, don't consider it
                if i >= self.initial_form_count() and not form.has_changed():
                    continue
                if self._should_delete_form(form):
                    self._deleted_form_indexes.append(i)
        return [self.forms[i] for i in self._deleted_form_indexes]