Why larastan raise error on relationLoaded method in resource file?

Question

In resource file app/Http/Resources/PostResource.php I use method :

<?php

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\JsonResource;

class PostResource extends JsonResource
{
    public function toArray($request)
    {
        $data = [
            'id' => $this->id,
            ...
            'mediaProp'=> $this->when($this->relationLoaded('mediaProp'), new MediaPropResource($this->mediaProp)),
        ];

But I got error when running larastan command :
Call to an undefined method App\Http\Resources\PostResource::relationLoaded()

I added PostResource class into phpstan.neon under universalObjectCratesClasses key:

includes:
    - ./vendor/nunomaduro/larastan/extension.neon

parameters:
    universalObjectCratesClasses:
        - Illuminate\Http\Resources\Json\JsonResource
        - App\Http\Resources\PostResource

    paths:
        - app/

    # Level 9 is the highest level
    level: 5

#    ignoreErrors:
#        - '#PHPDoc tag @var#'
#
#    excludePaths:
#        - ./*/*/FileToBeExcluded.php
#
#    checkMissingIterableValueType: false

But that does not help and i still got the same error. How can I fix it ?

"laravel/framework": "^10.8",
"nunomaduro/larastan": "^2.0",

Thanks in advance!

Answer 1

relationLoaded is a method that is defined in HasRelationships trait of Laravel. But PHPStan does not know the relation between a resource and model. So you need to add a @mixin annotation to your resource class. Like so:

<?php

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\JsonResource;

/** @mixin Post */
class PostResource extends JsonResource
....

Of course adjust the model namespace for your use case.