validateForeignKeyOnDeleteBehaviour example

if (!$isGeneric) {
                $associationViolations[$definition->getClass()][] = sprintf(
                    'Missing reference foreign key for column %s for definition association %s.%s',
                    $association->getReferenceField(),
                    $definition->getEntityName(),
                    $association->getPropertyName()
                );
            }
        }

        return $this->validateForeignKeyOnDeleteBehaviour($definition, $association, $reference, $associationViolations);
    }

    /** * @return array<int|string, mixed> */
    private function validateManyToMany(EntityDefinition $definition, ManyToManyAssociationField $association): array
    {
        $reference = $association->getToManyReferenceDefinition();

        $violations = $this->validateIsPlural($definition, $association);
        $violations = $this->validateSetterIsNotNull($definition, $association, $violations);