<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def apply(self, builder, model):
 """ Apply the scope to a given query builder. :param builder: The query builder :type builder: orator.orm.builder.Builder :param model: The model :type model: orator.orm.Model """

        builder.where_null(model.get_qualified_deleted_at_column())

        self.extend(builder)