@Annotations
On the previous guide you saw how to map resolvers (callables) from a existing SDL (.graphql or .gql). Annotations enables the other way around, it provides a GraphQL SDL from annotated PHP code.
Siler's GraphQL Annotations uses the super-powers from Doctrine's Annotations and like any other dependency, is a peer that we should explicitly require:
$ composer require doctrine/annotations
There are 9 annotations fulfilling the GraphQL's ecosystem:
Class annotations are:
- ObjectType
- InterfaceType
- InputType
- EnumType
- UnionType
- Directive
Complementary method and property annotations are:
- Field
- Args
- EnumVal
They follow a ubiquitous language to GraphQL spec, so if you know GraphQL, there is nothing new here, you probably already know what each of them does just by its name.
Let's start by defining our root query:
<?php declare(strict_types=1);
namespace App;
use GraphQL\Type\Definition\ResolveInfo;
use Siler\GraphQL\Annotation\Field;
use Siler\GraphQL\Annotation\ObjectType;
/** @ObjectType */
class Query
{
/** @Field(description="A common greet") */
public static function hello(): string
{
return 'Hello, World!';
}
}
The
ObjectType name will be inferred by the class name, so it will already be Query.Then we just provide this class to the
annotated function on the Siler\GraphQL namespace:<?php declare(strict_types=1);
namespace App;
use function Siler\GraphQL\{annotated, init};
require_once __DIR__ . '/vendor/autoload.php';
$schema = annotated([Query::class]);
init($schema);
And that is it! It auto-magically servers the following SDL:
type Query {
"""
A common greet
"""
hello: String!
}
With the static
hello method body already playing the resolver role, so:query {
hello
}
Returns:
{
"data": {
"hello": "Hello, World!"
}
}
For a full-featured example, please take a look at: github.com/leocavalcante/siler/examples/graphql-annotations
Parsing docblocks can be expensive, on production environments is recommended to cache this process by using a caching reader.
First, install
doctrine/cache:composer require doctrine/cache
Then pass a
Doctrine\Common\Cache\Cache to Siler\GraphQL\Deannotator::cache() like:Siler\GraphQL\Deannotator::cache(new ApcuCache());
Make sure you do this before the
annotated() call.Last modified 2yr ago