animethemes-server/app/GraphQL/Schema/Fields/Relations/BelongsToManyRelation.php

<?php

declare(strict_types=1);

namespace App\GraphQL\Schema\Fields\Relations;

use App\Enums\GraphQL\PaginationType;
use App\GraphQL\Argument\Argument;
use App\GraphQL\Argument\SortArgument;
use App\GraphQL\Schema\Types\ConnectionType;
use App\GraphQL\Schema\Types\EdgeType;
use App\GraphQL\Schema\Types\EloquentType;
use App\GraphQL\Schema\Types\Pivot\PivotType;
use GraphQL\Type\Definition\Type;
use Rebing\GraphQL\Support\Facades\GraphQL;

class BelongsToManyRelation extends Relation
{
    protected EdgeType $edgeType;
    protected ConnectionType $connectionType;

    public function __construct(
        protected EloquentType $ownerType,
        protected EloquentType $nodeType,
        protected string $relationName,
        protected ?PivotType $pivotType = null,
    ) {
        $this->edgeType = new EdgeType($ownerType, $nodeType, $pivotType);
        $this->connectionType = new ConnectionType($this->edgeType);

        GraphQL::addType($this->connectionType, $this->connectionType->name());

        parent::__construct(new $nodeType, $relationName);
    }

    /**
     * Resolve the arguments of the sub-query.
     *
     * @return Argument[]
     */
    public function arguments(): array
    {
        $pivotType = $this->pivotType;

        if ($pivotType instanceof PivotType) {
            return [
                ...parent::arguments(),

                ...(
                    $this->baseType()->getEnumSortClass() !== null || $this->sortEnum
                        ? [new SortArgument($this->baseType(), $this->sortEnum)]
                        : []
                ),
            ];
        }

        return parent::arguments();
    }

    /**
     * Get the edge type of the belongs to many relationship.
     */
    public function getEdgeType(): EdgeType
    {
        return $this->edgeType;
    }

    /**
     * Get the pivot type of the belongs to many relationship.
     */
    public function getPivotType(): ?PivotType
    {
        return $this->pivotType;
    }

    public function type(): Type
    {
        return Type::nonNull(GraphQL::type($this->connectionType->name()));
    }

    /**
     * The pagination type if applicable.
     */
    public function paginationType(): PaginationType
    {
        return PaginationType::CONNECTION;
    }
}