[Validator] Add the `When` constraint and validator #42593

wuchen90 · 2021-08-16T16:43:17Z

Q	A
Branch?	6.2
Bug fix?	no
New feature?	yes
Deprecations?	no
License	MIT
Doc PR	symfony/symfony-docs#15722

This constraint allows you to apply constraints validation only if the provided condition is matched.

Usage:

namespace App\Model;

use Symfony\Component\Validator\Constraints as Assert;

class Discount
{
    private $type; // 'percent' or 'absolute'

    /**
     * @Assert\GreaterThan(0)
     * @Assert\When(
     *     expression="this.type == 'percent'",
     *     constraints={@LessThan(100, message="The value should be between 0 and 100!")}
     * )
     */
    private $value;
    // ...
}

See the documentation for details.

carsonbot · 2021-08-16T16:43:20Z

Hey!

I see that this is your first PR. That is great! Welcome!

Symfony has a contribution guide which I suggest you to read.

In short:

Always add tests
Keep backward compatibility (see https://symfony.com/bc).
Bug fixes must be submitted against the lowest maintained branch where they apply (see https://symfony.com/releases)
Features and deprecations must be submitted against the 5.4 branch.

Review the GitHub status checks of your pull request and try to solve the reported issues. If some tests are failing, try to see if they are failing because of this change.

When two Symfony core team members approve this change, it will be merged and you will become an official Symfony contributor!
If this PR is merged in a lower version branch, it will be merged up to all maintained branches within a few days.

I am going to sit back now and wait for the reviews.

Cheers!

Carsonbot

carsonbot · 2021-08-17T12:47:00Z

Hey!

I think @lmasforne has recently worked with this code. Maybe they can help review this?

Cheers!

Carsonbot

wuchen90 · 2021-08-18T09:59:40Z

Actually there is no Deprecation or Bug in this PR but I don't know how to remove them.

lyrixx · 2021-08-18T10:03:25Z

How does it play with PHP Attribute?

wuchen90 · 2021-08-18T12:32:40Z

How does it play with PHP Attribute?

@lyrixx
I can't find a way to make it work with PHP attribute because the constraints option expects an array of constraint instances as value.
Maybe in future version of PHP attribute it will be permitted.

nicolas-grekas · 2021-08-18T14:36:03Z

what about Assert\When(expression="...", ...)?

src/Symfony/Component/Validator/Constraints/Conditional.php

derrabus · 2021-08-18T14:39:18Z

Maybe in future version of PHP attribute it will be permitted.

PHP 8.1. The future is now. 😉

See also #41994

Seb33300 · 2021-08-19T07:37:48Z

Looks related to #32877

wuchen90 · 2021-08-19T12:21:54Z

what about Assert\When(expression="...", ...)?

I don't have a preference for the name.
I would let the community decide on this and I will make the changes.

1️⃣ Assert\Conditional(condition="", ...)
2️⃣ Assert\When(expression="...", ...)
3️⃣ Assert\Condition(condition="", ...)

wuchen90 · 2021-08-19T13:13:21Z

Maybe in future version of PHP attribute it will be permitted.

PHP 8.1. The future is now. 😉

See also #41994

@derrabus Thanks!

I added PHP attributes support but I don't know how to fix PHPUnit / Tests (8.0) (pull_request) test...

julienfalque · 2021-11-19T13:28:27Z

src/Symfony/Component/Validator/Constraints/ConditionalValidator.php

+    {
+        if (null === $this->expressionLanguage) {
+            if (!class_exists(ExpressionLanguage::class)) {
+                throw new LogicException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');


Suggested change

throw new LogicException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');

throw new LogicException(sprintf('The "symfony/expression-language" component is required to use the "%s" constraint.', __CLASS__));

Maybe move this check to Conditional's constructor like it's done for Expression?

There is already the check in the constructor.

Indeed. This makes this check unnecessary then, because you can't reach this line without an instance of Conditional, which would have already performed the same check via its constructor.

Actually we can reach this line with an instance of a class that extends Conditional and with different constructor.
I get it won't almost never happen but it seems logic in the context of this validator class.
To be honest, I took this check from

symfony/src/Symfony/Component/Validator/Constraints/ExpressionValidator.php

Lines 74 to 76 in e0cadfb

if (!class_exists(ExpressionLanguage::class)) {

throw new LogicException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');

}

Right. Maybe the constraint class could be made final?

I don't think I should make it final because it will make the class non extendable for further implementation.

src/Symfony/Component/Validator/Tests/Constraints/ConditionalTest.php

src/Symfony/Component/Validator/Tests/Constraints/ConditionalValidatorTest.php

maxhelias · 2022-07-01T08:14:27Z

Oh I forgot, +1 for Assert\When(expression="...", ...) to be consistent with the dependency injection attribute

wuchen90 · 2022-08-08T12:44:51Z

@maxhelias
Thanks for the review.
I addressed the changes and did the same for the docs.

src/Symfony/Bundle/FrameworkBundle/Resources/config/validator.php

src/Symfony/Component/Validator/Constraints/When.php

src/Symfony/Component/Validator/Constraints/WhenValidator.php

xabbuh

LGTM (except for the minor comment)

src/Symfony/Component/Validator/CHANGELOG.md

src/Symfony/Component/Validator/Constraints/WhenValidator.php

src/Symfony/Component/Validator/Constraints/When.php

xabbuh · 2022-09-11T09:36:36Z

Thank you @wuchen90 and congratulations to your first Symfony contribution!

carsonbot added Status: Needs Review Bug Deprecation Feature Validator labels Aug 16, 2021

wuchen90 force-pushed the conditional-validator branch from 28c2de6 to 965f556 Compare August 17, 2021 09:58

nicolas-grekas added this to the 5.4 milestone Aug 18, 2021

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fabpot modified the milestones: 5.4, 6.1 Nov 3, 2021

noniagriconomie mentioned this pull request Nov 17, 2021

[Validator] Add Conditionally constraint #44116

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carsonbot added the Status: Reviewed label Jul 1, 2022

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wuchen90 changed the title ~~[Validator] Add the Conditional constraint and validator~~ [Validator] Add the When constraint and validator Aug 8, 2022

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wuchen90 force-pushed the conditional-validator branch from 421520f to 9b7bdc9 Compare August 12, 2022 14:00

xabbuh merged commit c5d14a6 into symfony:6.2 Sep 11, 2022

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fabpot mentioned this pull request Oct 24, 2022

Release v6.2.0-BETA1 #47972

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[FrameworkBundle] Remove obsolete feature detection #51620

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[Validator] Add the `When` constraint and validator #42593

[Validator] Add the `When` constraint and validator #42593

wuchen90 commented Aug 16, 2021 •

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xabbuh commented Sep 11, 2022

	throw new LogicException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
	throw new LogicException(sprintf('The "symfony/expression-language" component is required to use the "%s" constraint.', __CLASS__));

	if (!class_exists(ExpressionLanguage::class)) {
	throw new LogicException('Unable to use expressions as the Symfony ExpressionLanguage component is not installed.');
	}

[Validator] Add the When constraint and validator #42593

[Validator] Add the When constraint and validator #42593

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xabbuh commented Sep 11, 2022

[Validator] Add the `When` constraint and validator #42593

[Validator] Add the `When` constraint and validator #42593

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