Negative

Negative

New in version 4.3: The Negative constraint was introduced in Symfony 4.3.

Validates that a value is a negative number. Zero is neither positive nor negative, so you must use NegativeOrZero if you want to allow zero as value.

Basic Usage

The following constraint ensures that the withdraw of a bank account TransferItem is a negative number (lesser than zero):

• Annotations

  // src/Entity/TransferItem.php
  namespace App\Entity;
  use Symfony\Component\Validator\Constraints as Assert;
  class TransferItem
  {
      /**
       * @Assert\Negative
       */
      protected $withdraw;
  }

• YAML

  # config/validator/validation.yaml
  App\Entity\TransferItem:
      properties:
          withdraw:
              - Negative: ~

• XML

  <!-- config/validator/validation.xml -->
  <?xml version="1.0" encoding="UTF-8" ?>
  <constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping https://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">
      <class name="App\Entity\TransferItem">
          <property name="withdraw">
              <constraint name="Negative"></constraint>
          </property>
      </class>
  </constraint-mapping>

• PHP

  // src/Entity/TransferItem.php
  namespace App\Entity;
  use Symfony\Component\Validator\Constraints as Assert;
  use Symfony\Component\Validator\Mapping\ClassMetadata;
  class TransferItem
  {
      public static function loadValidatorMetadata(ClassMetadata $metadata)
      {
          $metadata->addPropertyConstraint('withdraw', new Assert\Negative());
      }
  }

Available Options

groups

type: array | string

It defines the validation group or groups this constraint belongs to. Read more about validation groups.

message

type: string default: This value should be negative.

The default message supplied when the value is not less than zero.

You can use the following parameters in this message:

payload

type: mixed default: null

This option can be used to attach arbitrary domain-specific data to a constraint. The configured payload is not used by the Validator component, but its processing is completely up to you.

For example, you may want to use several error levels to present failed constraints differently in the front-end depending on the severity of the error.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.