IdenticalTo

Validates that a value is identical to another value, defined in the options. To force that a value is not identical, see NotIdenticalTo.

Caution

This constraint compares using ===, so 3 and "3" are not considered equal. Use EqualTo to compare with ==.

Applies to property or method
Options
Class IdenticalTo
Validator IdenticalToValidator

Basic Usage

The following constraints ensure that:

  • firstName of Person class is equal to Mary and is a string
  • age is equal to 20 and is of type integer
  • Annotations
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    // src/Entity/Person.php
namespace App\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Person
{
    /**
     * @Assert\IdenticalTo("Mary")
     */
    protected $firstName;

    /**
     * @Assert\IdenticalTo(
     *     value = 20
     * )
     */
    protected $age;
}
  • YAML
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    # config/validator/validation.yaml
App\Entity\Person:
    properties:
        firstName:
            - IdenticalTo: Mary
        age:
            - IdenticalTo:
                value: 20
  • XML
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    <!-- 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\Person">
        <property name="firstName">
            <constraint name="IdenticalTo">
                Mary
            </constraint>
        </property>
        <property name="age">
            <constraint name="IdenticalTo">
                <option name="value">20</option>
            </constraint>
        </property>
    </class>
</constraint-mapping>
  • PHP
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    // src/Entity/Person.php
namespace App\Entity;

use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\Mapping\ClassMetadata;

class Person
{
    public static function loadValidatorMetadata(ClassMetadata $metadata)
    {
        $metadata->addPropertyConstraint('firstName', new Assert\IdenticalTo('Mary'));

        $metadata->addPropertyConstraint('age', new Assert\IdenticalTo([
            'value' => 20,
        ]));
    }
}

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 identical to {{ compared_value_type }} {{ compared_value }}.

This is the message that will be shown if the value is not identical.

You can use the following parameters in this message:

Parameter Description
{{ compared_value }} The expected value
{{ compared_value_type }} The expected value type
{{ value }} The current (invalid) value

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.

propertyPath

type: string

It defines the object property whose value is used to make the comparison.

For example, if you want to compare the $endDate property of some object with regard to the $startDate property of the same object, use propertyPath="startDate" in the comparison constraint of $endDate.

Tip

When using this option, its value is available in error messages as the {{ compared_value_path }} placeholder. Although it’s not intended to include it in the error messages displayed to end users, it’s useful when using APIs for doing any mapping logic on client-side.

value

type: mixed [default option]

This option is required. It defines the value to compare to. It can be a string, number or object.