Validate a field's constraint annotation against another field

Question

I have this entity class in Symfony/5.4:

use DoctrineORMMapping as ORM;
use SymfonyComponentValidatorConstraints as Assert;

classAssignments
{
    public const SALARY_RANGES = [
        'Red',
        'Green',
        null,
    ];

    /*** @ORMColumn(length=255, nullable=true)
     * @AssertChoice(choices=Assignments::SALARY_RANGES, strict=true)*/
    private ?string $salaryRange;

    /*** @ORMManyToOne(targetEntity="Employee", inversedBy="assignments")
     * @ORMJoinColumn(name="employee_id", referencedColumnName="id", onDelete="CASCADE")*/
    private ?Employee $employee;
}

I need to make sure that if employee is not null, then salaryRange has non-null value and vice versa. Is it possible to use constraint annotations to enforce this requirement?

I've been trying to use @AssertCallback but I can't figure out how to get the value of the other field. Maybe it's not even the right tool.

/*** @AssertCallback({"ExampleValidator", "assertEmployeeOnlyCallback"})*/

public static function assertEmployeeOnlyCallback(mixed $data, ExecutionContextInterface $context): void
{
    // `$data` contains value from `salaryRange` but, where is `employee`?
}

Answer 1

Just follow the documentation.

https://symfony.com/doc/5.3/reference/constraints/Callback.html

class Author
{
    // ...
    private int $field = 1;
    private string $otherField;
   /**
    * @Assert\Callback
    */    
    public function validate(ExecutionContextInterface $context, mixed $payload): void
    {
        
        if ($this->field > 1 && $this->otherField != '') {
            $context->buildViolation('Your validation message')
                ->atPath('toherField')
                ->addViolation();
        }
    }
}