Every item operation has an identifier in it’s URL. Although this identifier is usually a number, it can also be an UUID
, a date, or the type of your choice.
To help with your development experience, we introduced an identifier normalization process.
In the following chapter, we’re assuming that
App\Uuid
is a project-owned class that manages a time-based UUID.
Let’s say you have the following class, which is identified by a UUID
type. In this example, UUID
is not a simple string but it’s an object with many attributes.
<?php
namespace App\Entity;
use App\Uuid;
/**
* @ApiResource
*/
final class Person {
/**
* @var Uuid
* @ApiProperty(identifier=true)
*/
public $code;
}
Once registered as an ApiResource
, having an existing person, it will be accessible through the following URL: /people/110e8400-e29b-11d4-a716-446655440000
.
Note that the property identifying our resource is named code
.
Let’s create a DataProvider
for the Person
entity:
<?php
namespace App\DataProvider;
use App\Entity\Person;
use App\Uuid;
final class PersonDataProvider implements ItemDataProviderInterface, RestrictedDataProviderInterface {
/**
* {@inheritdoc}
*/
public function getItem(string $resourceClass, $identifiers, string $operationName = null, array $context = [])
{
// Our identifier is:
// $identifiers['code']
// although it's a string, it's not an instance of Uuid and we wanted to retrieve the timestamp of our time-based uuid:
// $identifiers['code']->getTimestamp()
}
/**
* {@inheritdoc}
*/
public function supports(string $resourceClass, string $operationName = null, array $context = []): bool
{
return $resourceClass === Person::class;
}
}
To cover this use case, we need to denormalize
the identifier to an instance of our App\Uuid
class. This case is covered by an identifier denormalizer:
<?php
namespace App\Identifier;
use ApiPlatform\Core\Exception\InvalidIdentifierException;
use App\Uuid;
use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
final class UuidNormalizer implements DenormalizerInterface
{
/**
* {@inheritdoc}
*/
public function denormalize($data, $class, $format = null, array $context = [])
{
try {
return Uuid::fromString($data);
} catch (InvalidUuidStringException $e) {
throw new InvalidIdentifierException($e->getMessage());
}
}
/**
* {@inheritdoc}
*/
public function supportsDenormalization($data, $type, $format = null)
{
return is_a($type, Uuid::class, true);
}
}
Tag this service as a api_platform.identifier.normalizer
:
<service id="App\Identifier\UuidNormalizer" class="App\Identifier\UuidNormalizer" public="false">
<tag name="api_platform.identifier.normalizer" />
</service>
services:
App\Identifier\UuidNormalizer:
tags:
- { name: api_platform.identifier.normalizer }
Your PersonDataProvider
will now work as expected!
ApiPlatform supports the following identifier types:
scalar
(string, integer)\DateTime
(uses the symfony DateTimeNormalizer
internally, see DateTimeIdentifierNormalizer)\Ramsey\Uuid\Uuid
(see UuidNormalizer)Made with love by
Les-Tilleuls.coop can help you design and develop your APIs and web projects, and train your teams in API Platform, Symfony, Next.js, Kubernetes and a wide range of other technologies.
Learn more