Automattic\WooCommerce\Vendor\GraphQL\Validator\Rules

SingleFieldSubscription::multipleFieldsInOperation │ public static │ WC 1.0

Method of the class: SingleFieldSubscription{}

No Hooks.

Returns

null. Nothing (null).

Usage

$result = SingleFieldSubscription::multipleFieldsInOperation( ?string $operationName ): string;
?string $operationName(required)
.

SingleFieldSubscription::multipleFieldsInOperation() code WC 10.9.1

woocommerce/lib/packages/GraphQL/Validator/Rules/SingleFieldSubscription.php 
public static function multipleFieldsInOperation(?string $operationName): string
{
    if ($operationName === null) {
        return 'Anonymous Subscription must select only one top level field.';
    }

    return "Subscription \"{$operationName}\" must select only one top level field.";
}