How to change type ?

[michaelnabil230]

Question:
Is there any way to switch to paginating products field or not?
the switch boolean flag will be for example called paginate which will be a query parameter

Versions:
graphql-laravel Version: 7.2
Laravel Version: 8.61
PHP Version: 8

class ProductsQuery extends Query
{
    protected $attributes = [
        'name' => 'products',
    ];

    public function type(): Type
    {
        return Type::nonNull(new UnionType([
            'name' => 'ProductMe',
            'types' => [
                GraphQL::paginate('Product'),
                GraphQL::type('Product'),
            ],
            'resolveType' => function ($value) {
                // I Want kenwo if the resolve function return data with paginate or array of products for set my type
                // or anther function for chuck for the result 
                if ($value == '') {
                    return Type::listOf(GraphQL::type('Product'));
                }
                return GraphQL::paginate('Product');
            }
        ]));

        // return Type::nonNull(GraphQL::paginate('Product'));
    }

    public function args(): array
    {
        return [
            // start paginate
            'paginate' => [
                'name' => 'paginate',
                'type' => Type::boolean(),
                'rules' => ['boolean'],
                'defaultValue' => true,
            ],
            'limit' => [
                'name' => 'limit',
                'type' => Type::int(),
                'rules' => ['required_if:paginate,true'],
                'defaultValue' => 15,
            ],
            'page' => [
                'name' => 'page',
                'type' => Type::int(),
                'rules' => ['required_if:paginate,true'],
            ],
            // end paginate
        ];
    }

    public function resolve($root, array $args, $context, ResolveInfo $info, SelectFields $fields)
    {
        $select = $fields->getSelect();
        $with = $fields->getRelations();
        
        return Product::query()
            ->select($select)
            ->with($with)
            ->when($args['paginate'], function ($q) use ($args) {
                return $q->paginate($args['limit'], ['*'], 'page', $args['page']);
            }, function ($q) {
                return $q->get();
            });
    }
}
?>

[mfn]

Regarding the union type: I have not had this particular use-case, but on paper, yes, something like this should work.

• types() announces the possible unions
• resovleType() receives the $value and, based on its content, you determine/return the actual type
  I've had cases where it was problematic just by inspection $value to know what type I would need, but that does not seems so in your case

Now whether this all can work that way in combination with the query builder, I can't say.

Is there a specific issue you have with your approach? Anything in particular not working?

[michaelnabil230]

As shown in the picture here, the problem is in the query

    public function resolve($root, array $args, $context, ResolveInfo $info, SelectFields $fields)
    {
        $select = $fields->getSelect();
        $with = $fields->getRelations();
        
        return Product::query()
            ->select($select)
            ->with($with)
            ->when($args['paginate'], function ($q) use ($args) {
                return $q->paginate($args['limit'], ['*'], 'page', $args['page']);
            }, function ($q) {
                return $q->get();
            });
    }

[michaelnabil230]

Hi friend are you here @mfn

[mfn]

Sorry, I don't have further suggestion currently. I'm not a user of SelectFields. I exclusively use solutions like https://www.google.com/search?hl=en&q=graphql%20dataloader%20php .

[michaelnabil230]

But i'm used with in Eloquent model in laravel maybe don't need another package, right ?

[michaelnabil230]

And maybe the my problem here

graphql-laravel/src/Support/SelectFields.php

Lines 256 to 260 in 5817033

	// If parent type is an union or interface we select all fields
	// because we don't know which other fields are required
	if (is_a($parentType, UnionType::class) || is_a($parentType, \GraphQL\Type\Definition\InterfaceType::class)) {
	$select = ['*'];
	}

[mehrabx]

I have the same problem. When we use ‍UnionType, there is a potential problem of n+1.

graphql-laravel/src/Support/SelectFields.php

Lines 256 to 260 in 5817033

	// If parent type is an union or interface we select all fields
	// because we don't know which other fields are required
	if (is_a($parentType, UnionType::class) || is_a($parentType, \GraphQL\Type\Definition\InterfaceType::class)) {
	$select = ['*'];
	}

Unlike line 258 of code, we know which fields are required according to the types defined in the union class.