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316 lines
12 KiB
PHP
316 lines
12 KiB
PHP
<?php
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declare(strict_types=1);
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namespace GraphQL\Tests;
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/**
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* This is designed to be an end-to-end test, demonstrating
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* the full GraphQL stack.
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*
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* We will create a GraphQL schema that describes the major
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* characters in the original Star Wars trilogy.
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*
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* NOTE: This may contain spoilers for the original Star
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* Wars trilogy.
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*/
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use Exception;
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use GraphQL\Type\Definition\EnumType;
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use GraphQL\Type\Definition\InterfaceType;
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use GraphQL\Type\Definition\NonNull;
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use GraphQL\Type\Definition\ObjectType;
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use GraphQL\Type\Definition\ResolveInfo;
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use GraphQL\Type\Definition\Type;
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use GraphQL\Type\Schema;
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use function array_intersect_key;
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use function array_map;
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/**
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* Using our shorthand to describe type systems, the type system for our
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* Star Wars example is:
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*
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* enum Episode { NEWHOPE, EMPIRE, JEDI }
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*
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* interface Character {
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* id: String!
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* name: String
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* friends: [Character]
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* appearsIn: [Episode]
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* }
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*
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* type Human implements Character {
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* id: String!
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* name: String
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* friends: [Character]
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* appearsIn: [Episode]
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* homePlanet: String
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* }
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*
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* type Droid implements Character {
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* id: String!
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* name: String
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* friends: [Character]
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* appearsIn: [Episode]
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* primaryFunction: String
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* }
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*
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* type Query {
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* hero(episode: Episode): Character
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* human(id: String!): Human
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* droid(id: String!): Droid
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* }
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*
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* We begin by setting up our schema.
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*/
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class StarWarsSchema
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{
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public static function build() : Schema
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{
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/**
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* The original trilogy consists of three movies.
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*
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* This implements the following type system shorthand:
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* enum Episode { NEWHOPE, EMPIRE, JEDI }
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*/
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$episodeEnum = new EnumType([
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'name' => 'Episode',
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'description' => 'One of the films in the Star Wars Trilogy',
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'values' => [
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'NEWHOPE' => [
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'value' => 4,
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'description' => 'Released in 1977.',
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],
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'EMPIRE' => [
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'value' => 5,
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'description' => 'Released in 1980.',
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],
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'JEDI' => [
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'value' => 6,
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'description' => 'Released in 1983.',
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],
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],
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]);
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$humanType = null;
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$droidType = null;
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/**
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* Characters in the Star Wars trilogy are either humans or droids.
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*
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* This implements the following type system shorthand:
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* interface Character {
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* id: String!
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* name: String
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* friends: [Character]
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* appearsIn: [Episode]
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* }
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*/
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$characterInterface = new InterfaceType([
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'name' => 'Character',
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'description' => 'A character in the Star Wars Trilogy',
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'fields' => static function () use (&$characterInterface, $episodeEnum) {
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return [
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'id' => [
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'type' => Type::nonNull(Type::string()),
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'description' => 'The id of the character.',
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],
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'name' => [
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'type' => Type::string(),
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'description' => 'The name of the character.',
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],
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'friends' => [
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'type' => Type::listOf($characterInterface),
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'description' => 'The friends of the character, or an empty list if they have none.',
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],
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'appearsIn' => [
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'type' => Type::listOf($episodeEnum),
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'description' => 'Which movies they appear in.',
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],
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'secretBackstory' => [
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'type' => Type::string(),
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'description' => 'All secrets about their past.',
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],
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];
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},
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'resolveType' => static function ($obj) use (&$humanType, &$droidType) {
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return StarWarsData::getHuman($obj['id']) === null ? $droidType : $humanType;
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},
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]);
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/**
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* We define our human type, which implements the character interface.
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*
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* This implements the following type system shorthand:
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* type Human implements Character {
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* id: String!
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* name: String
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* friends: [Character]
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* appearsIn: [Episode]
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* secretBackstory: String
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* }
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*/
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$humanType = new ObjectType([
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'name' => 'Human',
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'description' => 'A humanoid creature in the Star Wars universe.',
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'fields' => [
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'id' => [
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'type' => new NonNull(Type::string()),
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'description' => 'The id of the human.',
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],
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'name' => [
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'type' => Type::string(),
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'description' => 'The name of the human.',
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],
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'friends' => [
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'type' => Type::listOf($characterInterface),
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'description' => 'The friends of the human, or an empty list if they have none.',
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'resolve' => static function ($human, $args, $context, ResolveInfo $info) {
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$fieldSelection = $info->getFieldSelection();
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$fieldSelection['id'] = true;
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return array_map(
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static function ($friend) use ($fieldSelection) {
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return array_intersect_key($friend, $fieldSelection);
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},
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StarWarsData::getFriends($human)
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);
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},
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],
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'appearsIn' => [
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'type' => Type::listOf($episodeEnum),
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'description' => 'Which movies they appear in.',
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],
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'homePlanet' => [
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'type' => Type::string(),
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'description' => 'The home planet of the human, or null if unknown.',
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],
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'secretBackstory' => [
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'type' => Type::string(),
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'description' => 'Where are they from and how they came to be who they are.',
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'resolve' => static function () {
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// This is to demonstrate error reporting
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throw new Exception('secretBackstory is secret.');
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},
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],
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],
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'interfaces' => [$characterInterface],
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]);
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/**
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* The other type of character in Star Wars is a droid.
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*
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* This implements the following type system shorthand:
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* type Droid implements Character {
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* id: String!
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* name: String
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* friends: [Character]
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* appearsIn: [Episode]
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* secretBackstory: String
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* primaryFunction: String
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* }
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*/
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$droidType = new ObjectType([
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'name' => 'Droid',
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'description' => 'A mechanical creature in the Star Wars universe.',
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'fields' => [
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'id' => [
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'type' => Type::nonNull(Type::string()),
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'description' => 'The id of the droid.',
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],
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'name' => [
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'type' => Type::string(),
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'description' => 'The name of the droid.',
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],
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'friends' => [
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'type' => Type::listOf($characterInterface),
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'description' => 'The friends of the droid, or an empty list if they have none.',
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'resolve' => static function ($droid) {
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return StarWarsData::getFriends($droid);
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},
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],
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'appearsIn' => [
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'type' => Type::listOf($episodeEnum),
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'description' => 'Which movies they appear in.',
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],
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'secretBackstory' => [
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'type' => Type::string(),
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'description' => 'Construction date and the name of the designer.',
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'resolve' => static function () {
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// This is to demonstrate error reporting
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throw new Exception('secretBackstory is secret.');
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},
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],
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'primaryFunction' => [
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'type' => Type::string(),
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'description' => 'The primary function of the droid.',
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],
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],
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'interfaces' => [$characterInterface],
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]);
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/**
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* This is the type that will be the root of our query, and the
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* entry point into our schema. It gives us the ability to fetch
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* objects by their IDs, as well as to fetch the undisputed hero
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* of the Star Wars trilogy, R2-D2, directly.
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*
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* This implements the following type system shorthand:
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* type Query {
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* hero(episode: Episode): Character
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* human(id: String!): Human
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* droid(id: String!): Droid
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* }
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*/
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$queryType = new ObjectType([
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'name' => 'Query',
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'fields' => [
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'hero' => [
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'type' => $characterInterface,
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'args' => [
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'episode' => [
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'description' => 'If omitted, returns the hero of the whole saga. If provided, returns the hero of that particular episode.',
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'type' => $episodeEnum,
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],
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],
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'resolve' => static function ($root, $args) {
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return StarWarsData::getHero($args['episode'] ?? null);
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},
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],
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'human' => [
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'type' => $humanType,
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'args' => [
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'id' => [
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'name' => 'id',
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'description' => 'id of the human',
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'type' => Type::nonNull(Type::string()),
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],
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],
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'resolve' => static function ($root, $args) {
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$humans = StarWarsData::humans();
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return $humans[$args['id']] ?? null;
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},
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],
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'droid' => [
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'type' => $droidType,
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'args' => [
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'id' => [
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'name' => 'id',
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'description' => 'id of the droid',
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'type' => Type::nonNull(Type::string()),
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],
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],
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'resolve' => static function ($root, $args) {
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$droids = StarWarsData::droids();
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return $droids[$args['id']] ?? null;
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},
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],
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],
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]);
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return new Schema(['query' => $queryType]);
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}
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}
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