Fix prefetching the same GQL type for batch request

src/Parameters/PrefetchDataParameter.php

@@ -43,7 +43,7 @@ public function resolve(object|null $source, array $args, mixed $context, Resolv
         }
 
         $prefetchBuffer = $context->getPrefetchBuffer($this);
-        $prefetchBuffer->register($source, $args);
+        $prefetchBuffer->register($source, $args, $info);
 
         // The way this works is simple: GraphQL first iterates over every requested field and calls ->resolve()
         // on it. That, in turn, calls this method. GraphQL doesn't need the actual value just yet; it simply
@@ -53,20 +53,20 @@ public function resolve(object|null $source, array $args, mixed $context, Resolv
         // needed, GraphQL calls the callback of Deferred below. That's when we call the prefetch method,
         // already knowing all the requested fields (source-arguments combinations).
         return new Deferred(function () use ($info, $context, $args, $prefetchBuffer) {
-            if (! $prefetchBuffer->hasResult($args)) {
+            if (! $prefetchBuffer->hasResult($args, $info)) {
                 $prefetchResult = $this->computePrefetch($args, $context, $info, $prefetchBuffer);
 
-                $prefetchBuffer->storeResult($prefetchResult, $args);
+                $prefetchBuffer->storeResult($prefetchResult, $args, $info);
             }
 
-            return $prefetchResult ?? $prefetchBuffer->getResult($args);
+            return $prefetchResult ?? $prefetchBuffer->getResult($args, $info);
         });
     }
 
     /** @param array<string, mixed> $args */
     private function computePrefetch(array $args, mixed $context, ResolveInfo $info, PrefetchBuffer $prefetchBuffer): mixed
     {
-        $sources = $prefetchBuffer->getObjectsByArguments($args);
+        $sources = $prefetchBuffer->getObjectsByArguments($args, $info);
         $toPassPrefetchArgs = QueryField::paramsToArguments($this->fieldName, $this->parameters, null, $args, $context, $info, $this->resolver);
 
         return ($this->resolver)($sources, ...$toPassPrefetchArgs);

src/PrefetchBuffer.php

@@ -4,6 +4,8 @@
 
 namespace TheCodingMachine\GraphQLite;
 
+use GraphQL\Type\Definition\ResolveInfo;
+
 use function array_key_exists;
 use function md5;
 use function serialize;
@@ -20,14 +22,27 @@ class PrefetchBuffer
     private array $results = [];
 
     /** @param array<array-key, mixed> $arguments The input arguments passed from GraphQL to the field. */
-    public function register(object $object, array $arguments): void
-    {
-        $this->objects[$this->computeHash($arguments)][] = $object;
+    public function register(
+        object $object,
+        array $arguments,
+        ResolveInfo|null $info = null,
+    ): void {
+        $this->objects[$this->computeHash($arguments, $info)][] = $object;
     }
 
     /** @param array<array-key, mixed> $arguments The input arguments passed from GraphQL to the field. */
-    private function computeHash(array $arguments): string
-    {
+    private function computeHash(
+        array $arguments,
+        ResolveInfo|null $info,
+    ): string {
+        if (
+            $info instanceof ResolveInfo
+            && isset($info->operation)
+            && $info->operation->loc?->source?->body !== null
+        ) {
+            return md5(serialize($arguments) . $info->operation->loc->source->body);
+        }
+
         return md5(serialize($arguments));
     }
 
@@ -36,32 +51,43 @@ private function computeHash(array $arguments): string
      *
      * @return array<int, object>
      */
-    public function getObjectsByArguments(array $arguments): array
-    {
-        return $this->objects[$this->computeHash($arguments)] ?? [];
+    public function getObjectsByArguments(
+        array $arguments,
+        ResolveInfo|null $info = null,
+    ): array {
+        return $this->objects[$this->computeHash($arguments, $info)] ?? [];
     }
 
     /** @param array<array-key, mixed> $arguments The input arguments passed from GraphQL to the field. */
-    public function purge(array $arguments): void
-    {
-        unset($this->objects[$this->computeHash($arguments)]);
+    public function purge(
+        array $arguments,
+        ResolveInfo|null $info = null,
+    ): void {
+        unset($this->objects[$this->computeHash($arguments, $info)]);
     }
 
     /** @param array<array-key, mixed> $arguments The input arguments passed from GraphQL to the field. */
-    public function storeResult(mixed $result, array $arguments): void
-    {
-        $this->results[$this->computeHash($arguments)] = $result;
+    public function storeResult(
+        mixed $result,
+        array $arguments,
+        ResolveInfo|null $info = null,
+    ): void {
+        $this->results[$this->computeHash($arguments, $info)] = $result;
     }
 
     /** @param array<array-key, mixed> $arguments The input arguments passed from GraphQL to the field. */
-    public function hasResult(array $arguments): bool
-    {
-        return array_key_exists($this->computeHash($arguments), $this->results);
+    public function hasResult(
+        array $arguments,
+        ResolveInfo|null $info = null,
+    ): bool {
+        return array_key_exists($this->computeHash($arguments, $info), $this->results);
     }
 
     /** @param array<array-key, mixed> $arguments The input arguments passed from GraphQL to the field. */
-    public function getResult(array $arguments): mixed
-    {
-        return $this->results[$this->computeHash($arguments)];
+    public function getResult(
+        array $arguments,
+        ResolveInfo|null $info = null,
+    ): mixed {
+        return $this->results[$this->computeHash($arguments, $info)];
     }
 }

tests/Fixtures/Integration/Controllers/CompanyController.php

@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TheCodingMachine\GraphQLite\Fixtures\Integration\Controllers;
+
+use TheCodingMachine\GraphQLite\Annotations\Query;
+use TheCodingMachine\GraphQLite\Fixtures\Integration\Models\Company;
+
+class CompanyController
+{
+    /** @Query() */
+    public function getCompany(string $id): Company
+    {
+        return new Company('Company');
+    }
+}

tests/Fixtures/Integration/Controllers/ContactController.php

@@ -26,6 +26,16 @@ public function getContacts(): array
         ];
     }
 
+    #[Query]
+    public function getContact(string $name): ?Contact
+    {
+        return match( $name ) {
+            'Joe' => new Contact('Joe'),
+            'Bill' => new Contact('Bill'),
+            default => null,
+        };
+    }
+
     #[Mutation]
     public function saveContact(Contact $contact): Contact
     {

tests/Fixtures/Integration/Models/Company.php

@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TheCodingMachine\GraphQLite\Fixtures\Integration\Models;
+
+use TheCodingMachine\GraphQLite\Annotations\Type;
+
+/**
+ * @Type()
+ */
+class Company
+{
+    public function __construct(
+         public readonly string $name
+    ) {
+    }
+}

tests/Fixtures/Integration/Types/CompanyType.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TheCodingMachine\GraphQLite\Fixtures\Integration\Types;
+
+use TheCodingMachine\GraphQLite\Annotations\ExtendType;
+use TheCodingMachine\GraphQLite\Annotations\Field;
+use TheCodingMachine\GraphQLite\Annotations\Prefetch;
+use TheCodingMachine\GraphQLite\Fixtures\Integration\Models\Company;
+use TheCodingMachine\GraphQLite\Fixtures\Integration\Models\Contact;
+
+/**
+ * @ExtendType(class=Company::class)
+ */
+class CompanyType
+{
+   /**
+     * @Field()
+     */
+    public function getName(Company $company): string
+    {
+        return $company->name;
+    }
+
+    /**
+     * @Field()
+     */
+    public function getContact(
+        Company $company,
+        #[Prefetch('prefetchContacts')]
+        array $contacts
+    ): ?Contact {
+        return $contacts[$company->name] ?? null;
+    }
+
+    public static function prefetchContacts(array $companies): array
+    {
+        $contacts = [];
+
+        foreach ($companies as $company) {
+             $contacts[$company->name] = new Contact('Kate');
+        }
+
+        return $contacts;
+    }
+}

tests/Fixtures/Integration/Types/ContactType.php

@@ -3,6 +3,7 @@
 
 namespace TheCodingMachine\GraphQLite\Fixtures\Integration\Types;
 
+use TheCodingMachine\GraphQLite\Fixtures\Integration\Models\Post;
 use TheCodingMachine\GraphQLite\Annotations\Prefetch;
 use function array_search;
 use function strtoupper;
@@ -53,4 +54,55 @@ public static function prefetchContacts(iterable $contacts, string $prefix)
             'prefix' => $prefix
         ];
     }
+
+    /**
+     * @Field()
+     * @return Post[]|null
+     */
+    public function getPosts(
+        Contact $contact,
+        #[Prefetch('prefetchPosts')]
+        $posts
+    ): ?array {
+        return $posts[$contact->getName()] ?? null;
+    }
+
+    public static function prefetchPosts(iterable $contacts): array
+    {
+        $posts = [];
+        foreach ($contacts as $contact) {
+            $contactPost = array_filter(
+                self::getContactPosts(),
+                fn(Post $post) => $post->author?->getName() === $contact->getName()
+            );
+
+            if ([] === $contactPost) {
+                continue;
+            }
+
+            $posts[$contact->getName()] = $contactPost;
+        }
+
+        return $posts;
+    }
+
+    private static function getContactPosts(): array
+    {
+        return [
+            self::generatePost('First Joe post', '1', new Contact('Joe')),
+            self::generatePost('First Bill post', '2', new Contact('Bill')),
+            self::generatePost('First Kate post', '3', new Contact('Kate')),
+        ];
+    }
+
+    private static function generatePost(
+        string $title,
+        string $id,
+        Contact $author,
+    ): Post {
+        $post = new Post($title);
+        $post->id = $id;
+        $post->author = $author;
+        return $post;
+    }
 }

tests/Fixtures/Integration/Types/PostType.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TheCodingMachine\GraphQLite\Fixtures\Integration\Types;
+
+use TheCodingMachine\GraphQLite\Annotations\ExtendType;
+use TheCodingMachine\GraphQLite\Annotations\Field;
+use TheCodingMachine\GraphQLite\Fixtures\Integration\Models\Post;
+
+/**
+ * @ExtendType(class=Post::class)
+ */
+class PostType
+{
+    /**
+     * @Field()
+     */
+    public function getId(Post $post): int
+    {
+        return (int) $post->id;
+    }
+
+    /**
+     * @Field()
+     */
+    public function getTitle(Post $post): string
+    {
+        return $post->title;
+    }
+}