Question 210211 in PHP Question posted in
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Php – Constraint annotation to validate one field depending on another field

I have this entity class in Symfony/5.4:

use DoctrineORMMapping as ORM;
use SymfonyComponentValidatorConstraints as Assert;

class Assignments
{
    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 ensure that salaryRange has a non-null value if, and only if, employee is not null. Is it possible to enforce that with constraint annotations?

I’ve been playing with @AssertCallback but I couldn’t figure out how to get the value of the other field. Perhaps 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`?
}
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2

Answers


  1. Chosen as BEST ANSWER
    0

    You can use an Expression constraint. If the expression is true, validation will pass. If the expression is false, there will be a violation.

    It can be written in a single assertion, but you can write a couple of them in order to provide more accurate messages:

    /**
 * @ORMColumn(length=255, nullable=true)
 * @AssertExpression(
 *     "value !== null || this.getEmployee() === null",
 *     message="This value should not be null for employee assignments."
 * )
 * @AssertExpression(
 *     "value === null || this.getEmployee() !== null",
 *     message="This field can only be set for employee assignments."
 * )
 * @AssertChoice(choices=Assignments::SALARY_RANGES, strict=true)
 */
private ?string $salaryRange = null;

    In my case, I also had to set a default value because I'm using a PHP typed property.


  2. 0

    just follow the documentation

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

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