code: func (q *Query) Deleted() *Query {
  	if q.model != nil {
  		if err := q.model.Table().mustSoftDelete(); err != nil {
  			return q.err(err)
  		}
  	}
  	q.deleted = true
  	return q
  }
docs: // Deleted adds `WHERE deleted_at IS NOT NULL` clause for soft deleted models.