Count

Validates that a given collection's (i.e. an array or an object that implements Countable) element count is between some minimum and maximum value.

Applies to	property or method
Class	Count
Validator	CountValidator

Basic Usage

To verify that the emails array field contains between 1 and 5 elements you might add the following:

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        // src/Entity/Participant.php
namespace App\Entity;

use Symfony\Component\Validator\Constraints as Assert;

class Participant
{
    #[Assert\Count(
        min: 1,
        max: 5,
        minMessage: 'You must specify at least one email',
        maxMessage: 'You cannot specify more than {{ limit }} emails',
    )]
    protected array $emails = [];
}
    

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        # config/validator/validation.yaml
App\Entity\Participant:
    properties:
        emails:
            - Count:
                min: 1
                max: 5
                minMessage: 'You must specify at least one email'
                maxMessage: 'You cannot specify more than {{ limit }} emails'
    

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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\Participant">
        <property name="emails">
            <constraint name="Count">
                <option name="min">1</option>
                <option name="max">5</option>
                <option name="minMessage">You must specify at least one email</option>
                <option name="maxMessage">You cannot specify more than {{ limit }} emails</option>
            </constraint>
        </property>
    </class>
</constraint-mapping>
    

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        // src/Entity/Participant.php
namespace App\Entity;

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

class Participant
{
    // ...

    public static function loadValidatorMetadata(ClassMetadata $metadata): void
    {
        $metadata->addPropertyConstraint('emails', new Assert\Count([
            'min' => 1,
            'max' => 5,
            'minMessage' => 'You must specify at least one email',
            'maxMessage' => 'You cannot specify more than {{ limit }} emails',
        ]));
    }
}
    

Options

`divisibleBy`

type: integer default: null

Validates that the number of elements of the given collection is divisible by a certain number.

`divisibleByMessage`

type: string default: The number of elements in this collection should be a multiple of {{ compared_value }}.

The message that will be shown if the number of elements of the given collection is not divisible by the number defined in the divisibleBy option.

You can use the following parameters in this message:

Parameter	Description
`{{ compared_value }}`	The number configured in the `divisibleBy` option

`exactMessage`

type: string default: This collection should contain exactly {{ limit }} elements.

The message that will be shown if min and max values are equal and the underlying collection elements count is not exactly this value.

You can use the following parameters in this message:

Parameter	Description
`{{ count }}`	The current collection size
`{{ limit }}`	The exact expected collection size

`groups`

type: array | string default: null

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

`max`

type: integer

This option is the "max" count value. Validation will fail if the given collection elements count is greater than this max value.

This option is required when the min option is not defined.

`maxMessage`

type: string default: This collection should contain {{ limit }} elements or less.

The message that will be shown if the underlying collection elements count is more than the max option.

You can use the following parameters in this message:

Parameter	Description
`{{ count }}`	The current collection size
`{{ limit }}`	The upper limit

`min`

type: integer

This option is the "min" count value. Validation will fail if the given collection elements count is less than this min value.

This option is required when the max option is not defined.

`minMessage`

type: string default: This collection should contain {{ limit }} elements or more.

The message that will be shown if the underlying collection elements count is less than the min option.

You can use the following parameters in this message:

Parameter	Description
`{{ count }}`	The current collection size
`{{ limit }}`	The lower limit

`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.

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