IsNull
Edit this pageIsNull
Validates that a value is exactly equal to null. To force that a property
is blank (blank string or null), see the Blank
constraint. To ensure that a property is not null, see NotNull.
Also see NotNull.
| Applies to | property or method |
| Class | IsNull |
| Validator | IsNullValidator |
Basic Usage
If, for some reason, you wanted to ensure that the firstName property
of an Author class exactly equal to null, you could do the following:
- Attributes
- YAML
- XML
- PHP
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// src/Entity/Author.php
namespace App\Entity;
use Symfony\Component\Validator\Constraints as Assert;
class Author
{
#[Assert\IsNull]
protected $firstName;
}Options
groups
type: array | string
It defines the validation group or groups of this constraint. Read more about validation groups.
message
type: string default: This value should be null.
This is the message that will be shown if the value is not null.
You can use the following parameters in this message:
| Parameter | Description |
|---|---|
{{ value }} |
The current (invalid) value |
{{ label }} |
Corresponding form field label |
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.
