addSql('ALTER TABLE image DROP FOREIGN KEY FK_C53D045F19EB6921'); $this->addSql('ALTER TABLE image ADD CONSTRAINT FK_C53D045F19EB6921 FOREIGN KEY (client_id) REFERENCES client (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 image DROP FOREIGN KEY FK_C53D045F19EB6921'); $this->addSql('ALTER TABLE image ADD CONSTRAINT FK_C53D045F19EB6921 FOREIGN KEY (client_id) REFERENCES client (id)'); } }