addSql('ALTER TABLE client DROP FOREIGN KEY FK_C7440455CCD7E912'); $this->addSql('ALTER TABLE client ADD CONSTRAINT FK_C7440455CCD7E912 FOREIGN KEY (menu_id) REFERENCES menu (id) ON DELETE SET NULL'); } public function down(Schema $schema): void { // this down() migration is auto-generated, please modify it to your needs $this->addSql('ALTER TABLE client DROP FOREIGN KEY FK_C7440455CCD7E912'); $this->addSql('ALTER TABLE client ADD CONSTRAINT FK_C7440455CCD7E912 FOREIGN KEY (menu_id) REFERENCES menu (id)'); } }