title	slug
API	/graphql/api

The Symfony Boilerplate uses GraphQLite to quickly build a GraphQL API based on your models and use cases.

As the documentation of this PHP library covers a lot of aspects, consider reading it to have a better understanding of its functionalities.

Queries

A GraphQL query is like a REST GET request.

Thanks to the @Query annotation, you may transform any method in the App\UseCase namespace into a valid GraphQL endpoint.

use TheCodingMachine\GraphQLite\Annotations\Query;

/**
 * @Query
 */
public function helloWorld(): string 
{
    return "Hello world";
}

Of course, this is a simple example. More complex examples are available in the source code of the application and in the next chapters.

Mutations

A GraphQL mutation is like a REST POST request.

Thanks to the @Mutation annotation, you may transform any method in the App\UseCase namespace into a valid GraphQL endpoint.

use TheCodingMachine\GraphQLite\Annotations\Mutation;

/**
 * @Mutation
 */
public function createFoo(string $bar): Foo 
{
    $foo = new Foo($bar);
    $this->fooDao->save($foo);
    
    return $foo;
}

Of course, this is a simple example. More complex examples are available in the source code of the application and in the next chapters.

Models

Thanks to @Type and @SourceField annotations, you may convert any PHP class in the App\Domain\Model namespace to a valid GraphQL type:

use TheCodingMachine\GraphQLite\Annotations\SourceField;
use TheCodingMachine\GraphQLite\Annotations\Type;

/**
 * @Type
 * @SourceField(name="id", outputType="ID")
 * @SourceField(name="firstName")
 * @SourceField(name="lastName")
 * @SourceField(name="email")
 * @SourceField(name="locale")
 * @SourceField(name="profilePicture")
 * @SourceField(name="role")
 * @SourceField(name="activated")
 */
class User extends BaseUser {}

The @SourceField annotation will look for methods named {name}(), is{Name}() and get{Name}() across the current class or the parents classes.

:::note

📣 Identifiers should have the outputType="ID" parameter.

:::

To allow GraphQLite to automatically inject an instance of User in a query or mutation, i.e:

/**
 * @Mutation
 */
public function updateUser(User $user, string $firstName, string $lastName): User {}

You have to create a GraphQLite factory in the DAO:

use TheCodingMachine\GraphQLite\Annotations\Factory;
use TheCodingMachine\GraphQLite\Annotations\HideParameter;

/**
 * @Factory
 * @HideParameter(for="$lazyLoading")
 */
public function getById(string $id, bool $lazyLoading = false): User
{
    return parent::getById($id, $lazyLoading);
}

In your GraphQL client, you may now call this mutation by using the id parameter of the factory:

mutation updateUser(
    $id: String!
    $firstName: String!
    $lastName: String!
) {
    updateUser(
        user: { id: $id }
        firstName: $firstName
        lastName: $lastName
    ) {
        id
        firstName
        lastName
    }
}

Enums

Classes from the namespace App\Domain\Enum which extends MyCLabs\Enum\Enum are automatically converted to valid GraphQL types.

For instance:

use MyCLabs\Enum\Enum;

/**
 * @method static Role ADMINISTRATOR()
 * @method static Role USER()
 */
final class Role extends Enum
{
    private const ADMINISTRATOR = 'ADMINISTRATOR';
    private const USER          = 'USER';
}

/**
 * @Mutation 
 */
public function updateUserRole(User $user, Role $role): User {}

mutation updateUserRole(
    $id: String!
    $role: Role! # "ADMINISTRATOR" or "USER"
) {
    updateUserRole(
        user: { id: $id }
        role: $role
    ) {
        id
        role
    }
}

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