GraphQL Relay

Relay support for our GraphQL implementation.

Requirements

• PHP >= 7.1

Usage

Installation

Run the following command to install the package through Composer:

composer require digiaonline/graphql-relay:dev-master

Example

Executing this script:

use function Digia\GraphQL\buildSchema;
use function Digia\GraphQL\graphql;

$source = file_get_contents(__DIR__ . '/star-wars.graphqls');

$schema = buildSchema($source, [
    'Query'   => [
        'rebels' => function () {
            return rebels();
        },
        'empire' => function () {
            return empire();
        }
    ],
    'Faction' => [
        'ships' => function ($faction, $args) {
            $data      = getShips($faction);
            $arguments = ConnectionArguments::fromArray($args);
            return ArrayConnectionBuilder::fromArray($data, $arguments);
        }
    ]
]);

$result = graphql($schema, '
query RebelsShipsQuery {
  rebels {
    name,
    ships(first: 1) {
      edges {
        node {
          name
        }
      }
    }
  }
}');

print_r($result);

Produces the following output:

Array
(
    [rebels] => Array
        (
            [name] => Alliance to Restore the Republic
            [ships] => Array
                (
                    [edges] => Array
                        (
                            [0] => Array
                                (
                                    [node] => Array
                                        (
                                            [name] => X-Wing
                                        )
                                        
                                )
                                
                        )
                        
                )
                
        )
        
)

The schema definition used looks like this:

"A connection to a list of items."
interface Connection {
    "A list of edges."
    edges: [Edge]
    "Information to aid in pagination."
    pageInfo: PageInfo!
}

"An edge in a connection."
interface Edge {
    "A cursor for use in pagination."
    cursor: String!
    "The item at the end of the edge."
    node: Node
}

"An object with an ID."
interface Node {
    "ID of the object."
    id: ID!
}

"Information about pagination in a connection."
type PageInfo {
    "When paginating forwards, are there more items?"
    hasPreviousPage: Boolean!
    "When paginating backwards, are there more items?"
    hasNextPage: Boolean!
    "When paginating backwards, the cursor to continue."
    endCursor: String
    "When paginating forwards, the cursor to continue."
    startCursor: String
}

type Faction implements Node {
    "The ID of an object."
    id: ID!
    "The name of the faction."
    name: String
    "The ships used by the faction."
    ships(after: String, before: String, first: Int, last: Int): ShipConnection
}

"A ship in the Star Wars saga"
type Ship implements Node {
    "The ID of an object."
    id: ID!
    "The name of the ship."
    name: String
}

type ShipConnection implements Connection {
    edges: [ShipEdge]
    pageInfo: PageInfo!
}

type ShipEdge implements Edge {
    cursor: String!
    node: Ship
}

type Query {
    rebels: Faction
    empire: Faction
    node(id: ID!): Node
}

schema {
    query: Query
}

Node root field

For implementing the Node root field a convenience class is provided:

Convert Type and ID to Global ID

$nodeId = Node::toGlobalId('Ship', '1');

returns a global ID which can be passed to the node root:

U2hpcDox

Convert Global ID back to type and ID

$node = Node::fromGlobalId('U2hpcDox');

returns an object which can be queried:

$node->getType(); // Ship
$node->getId(); // 1

Node root resolver

For an example of how to implement the node root resolver please check the StarWarsConnectionTest.php

Contributing

Please read our guidelines.

License

See LICENSE.