如何在lighthouse graphql laravel中获取自定义指令参数？

Question

我的问题是关于自定义指令https:/lighthouse-php.com4.11the-basicsdirectives.html#定义。

我的模式是

type Query {
  sayFriendly: String @append(text: ", please.")
}

在lighthouse.php的配置中，我已经有了... ...

'namespaces' => [
        'models' => ['App', 'App\Models'],
        'queries' => 'App\GraphQL\Queries',
        'mutations' => 'App\GraphQL\Mutations',
        'subscriptions' => 'App\GraphQL\Subscriptions',
        'interfaces' => 'App\GraphQL\Interfaces',
        'unions' => 'App\GraphQL\Unions',
        'scalars' => 'App\GraphQL\Scalars',
        'directives' => ['App\GraphQL\Directives'],
    ],

指令启用。

我在App/GraphQL/Directives/appendDirective处定义了指令为

<?php

namespace AppGraphQLDirectives;

use Closure;
use GraphQLTypeDefinitionResolveInfo;
use NuwaveLighthouseSchemaValuesFieldValue;
use NuwaveLighthouseSupportContractsDirective;
use NuwaveLighthouseSupportContractsFieldMiddleware;
use NuwaveLighthouseSupportContractsGraphQLContext;

class appendDirective implements Directive, FieldMiddleware
{
    /**
     * Name of the directive as used in the schema.
     *
     * @return string
     */
    public function name(): string
    {
        return 'append';
    }

    /**
     * Wrap around the final field resolver.
     *
     * @param NuwaveLighthouseSchemaValuesFieldValue $fieldValue
     * @param Closure $next
     * @return NuwaveLighthouseSchemaValuesFieldValue
     */
    public function handleField(FieldValue $fieldValue, Closure $next): FieldValue
    {

        // Retrieve the existing resolver function
        /** @var Closure $previousResolver */
        $previousResolver = $fieldValue->getResolver();

        // Wrap around the resolver
        $wrappedResolver = function ($root, array $args, GraphQLContext $context, ResolveInfo $info) use ($previousResolver): string {
            // Call the resolver, passing along the resolver arguments
            /** @var string $result */
            $result = $previousResolver($root, $args, $context, $info);
            return ($result);
        };

        // Place the wrapped resolver back upon the FieldValue
        // It is not resolved right now - we just prepare it
        $fieldValue->setResolver($wrappedResolver);

        // Keep the middleware chain going
        return $next($fieldValue);
    }

}

我怎样才能从我的指令中得到键 "text "的值，并追加到$result [ @append(text:", please.")].$args是一个空数组（应该是，因为我做了参数化的查询[sayFriendly]）。