UpdateProjectMutation.php

<?php
namespace App\GraphQL\Mutations\System\TranslationManager\Projects;

// Project Model
use App\System\TranslationManager\Project\Project;

use GraphQL;

use GraphQL\Type\Definition\Type;
use Rebing\GraphQL\Support\Mutation;
use Rebing\GraphQL\Support\SelectFields;
use Illuminate\Http\Request;

class UpdateProjectMutation extends Mutation
{
    protected $attributes = [
        'name' => 'UpdateProjectMutation'
    ];

    public function type()
    {
        return GraphQL::type('projects_type');
    }

    public function args()
    {
        return [
            'id' => ['name' => 'id', 'type' => Type::nonNull(Type::int())],
            'name' => ['name' => 'name', 'type' => Type::nonNull(Type::string())],
            'status' => ['name' => 'status', 'type' => Type::nonNull(Type::string())],
            'locales' => ['name' => 'locales', 'type' => Type::listOf(GraphQL::type('locales_input_object_type'))],
        ];
    }

    public function resolve($root, $args, SelectFields $fields)
    {
        $project = Project::find($args['id']);

        if (!$project) {
            return null;
        }

        $project->update([
            'name' => $args['name'],
            'status' => $args['status']
        ]);

        // Use $args['locales'] array to update locale relations of the project model

        return $project;
    }
}