[FIXED] Symfony @Assert\Type("string") validation passes with integer value

Issue

I have a problem with validation of a field of type string in symfony 4. Here is an example:

<?php

class Foo {
    
    /**
     * @Assert\NotNull
     * @Assert\Type("string")
     *
     * @var string
     */
    protected string $uid;
}

And when I send (PUT) request like this it passes:

{
    "uid": 5,
}

The validation is working the other way around. If I set the field to integer and pass some string like "test" is properly validated.

Solution

That is due to the fact that integers are automatically interpreted as strings when used as strings in PHP. You will want to use a regex constraint, the example in the docs does what you want. Something like this:

<?php

class Foo {
    
    /**
     * @Assert\NotNull
     * @Assert\Regex(
     *     pattern="/\d/",
     *     match=false,
     *     message="Your name cannot contain a number"
     * )
     *
     * @var string
     */
    protected string $uid;
}

Answered By - Arleigh Hix