var r T
	base := s.c.g.apply(ctx).Model(r)

	switch op.Type {
	case clause.OpCreate:
		return s.handleAssociationCreate(ctx, base, op)
	case clause.OpUnlink, clause.OpDelete, clause.OpUpdate:
		return s.handleAssociation(ctx, base, op)
	default:
		return fmt.Errorf("unknown association operation type: %v", op.Type)
	}
}