ApiPltaform-GraphQL问题-DatetimeType字段中的空值抛出“找不到资源\“ DateTime \”“

如何解决ApiPltaform-GraphQL问题-DatetimeType字段中的空值抛出“找不到资源\“ DateTime \”“

受影响的API平台版本：v2.5.7（在PHP 7.4上为symfony v4.4.13）

说明
我有一个实体，其中的字段具有自定义类型。

如果该字段不为空，则效果很好。

如果有一个值为空的项目，它将抛出一个"Resource \"DateTime\" not found

我创建了一个自定义的DateTimeType，在该自定义类型所键入的字段上有一些带有空值的项目。

如果结果中有一个空值，我会得到这样的错误：

{
  "errors": [
    {
      "debugMessage": "Resource \"DateTime\" not found.","message": "Internal server error","extensions": {
        "category": "internal"
      },"locations": [
        {
          "line": 6,"column": 9
        }
      ],"path": [
        "users","edges",1,"node","sampleNullableDate"
      ],"trace": [
        {
          "file": "/var/www/app/vendor/api-platform/core/src/Metadata/Resource/Factory/AnnotationResourceFilterMetadataFactory.php","line": 55,"call": "ApiPlatform\\Core\\Metadata\\Resource\\Factory\\AnnotationResourceFilterMetadataFactory::handleNotFound(null,'DateTime')"
        },{
          "file": "/var/www/app/vendor/api-platform/core/src/Metadata/Resource/Factory/OperationResourceMetadataFactory.php","line": 57,"call": "ApiPlatform\\Core\\Metadata\\Resource\\Factory\\AnnotationResourceFilterMetadataFactory::create('DateTime')"
        },{
          "file": "/var/www/app/vendor/api-platform/core/src/Metadata/Resource/Factory/FormatsResourceMetadataFactory.php","line": 53,"call": "ApiPlatform\\Core\\Metadata\\Resource\\Factory\\OperationResourceMetadataFactory::create('DateTime')"
        },{
          "file": "/var/www/app/vendor/api-platform/core/src/Metadata/Resource/Factory/CachedResourceMetadataFactory.php","line": 47,"call": "ApiPlatform\\Core\\Metadata\\Resource\\Factory\\FormatsResourceMetadataFactory::create('DateTime')"
        },{
          "file": "/var/www/app/vendor/api-platform/core/src/Cache/CachedTrait.php","line": 44,"call": "ApiPlatform\\Core\\Metadata\\Resource\\Factory\\CachedResourceMetadataFactory::ApiPlatform\\Core\\Metadata\\Resource\\Factory\\{closure}()"
        },"line": 48,"call": "ApiPlatform\\Core\\Metadata\\Resource\\Factory\\CachedResourceMetadataFactory::getCached('resource_metadata_8cf10d2341ed01492506085688270c1e',instance of Closure)"
        },{
          "file": "/var/www/app/vendor/api-platform/core/src/GraphQl/Resolver/Stage/ReadStage.php","line": 60,"call": "ApiPlatform\\Core\\Metadata\\Resource\\Factory\\CachedResourceMetadataFactory::create('DateTime')"
        },{
          "file": "/var/www/app/vendor/api-platform/core/src/GraphQl/Resolver/Factory/ItemResolverFactory.php","line": 70,"call": "ApiPlatform\\Core\\GraphQl\\Resolver\\Stage\\ReadStage::__invoke('DateTime','App\\Entity\\User','item_query',array(5))"
        },{
          "file": "/var/www/app/vendor/webonyx/graphql-php/src/Executor/ReferenceExecutor.php","line": 630,"call": "ApiPlatform\\Core\\GraphQl\\Resolver\\Factory\\ItemResolverFactory::ApiPlatform\\Core\\GraphQl\\Resolver\\Factory\\{closure}(array(4),array(0),null,instance of GraphQL\\Type\\Definition\\ResolveInfo)"
        },"line": 557,"call": "GraphQL\\Executor\\ReferenceExecutor::resolveFieldValueOrError(instance of GraphQL\\Type\\Definition\\FieldDefinition,instance of GraphQL\\Language\\AST\\FieldNode,instance of Closure,array(4),"line": 1200,"call": "GraphQL\\Executor\\ReferenceExecutor::resolveField(GraphQLType: User,instance of ArrayObject(1),"line": 1147,"call": "GraphQL\\Executor\\ReferenceExecutor::executeFields(GraphQLType: User,instance of ArrayObject(2))"
        },"line": 1106,"call": "GraphQL\\Executor\\ReferenceExecutor::collectAndExecuteSubfields(GraphQLType: User,array(4))"
        },"line": 796,"call": "GraphQL\\Executor\\ReferenceExecutor::completeObjectValue(GraphQLType: User,instance of GraphQL\\Type\\Definition\\ResolveInfo,"line": 662,"call": "GraphQL\\Executor\\ReferenceExecutor::completeValue(GraphQLType: User,"line": 564,"call": "GraphQL\\Executor\\ReferenceExecutor::completeValueCatchingError(GraphQLType: User,"call": "GraphQL\\Executor\\ReferenceExecutor::resolveField(GraphQLType: UserEdge,array(2),"call": "GraphQL\\Executor\\ReferenceExecutor::executeFields(GraphQLType: UserEdge,array(3),instance of ArrayObject(1))"
        },"call": "GraphQL\\Executor\\ReferenceExecutor::collectAndExecuteSubfields(GraphQLType: UserEdge,array(2))"
        },"call": "GraphQL\\Executor\\ReferenceExecutor::completeObjectValue(GraphQLType: UserEdge,"call": "GraphQL\\Executor\\ReferenceExecutor::completeValue(GraphQLType: UserEdge,"line": 895,"call": "GraphQL\\Executor\\ReferenceExecutor::completeValueCatchingError(GraphQLType: UserEdge,"line": 764,"call": "GraphQL\\Executor\\ReferenceExecutor::completeListValue(GraphQLType: UserEdge,"call": "GraphQL\\Executor\\ReferenceExecutor::resolveField(GraphQLType: UserConnection,"call": "GraphQL\\Executor\\ReferenceExecutor::executeFields(GraphQLType: UserConnection,array(1),"call": "GraphQL\\Executor\\ReferenceExecutor::collectAndExecuteSubfields(GraphQLType: UserConnection,array(3))"
        },"call": "GraphQL\\Executor\\ReferenceExecutor::completeObjectValue(GraphQLType: UserConnection,"call": "GraphQL\\Executor\\ReferenceExecutor::completeValue(GraphQLType: UserConnection,"call": "GraphQL\\Executor\\ReferenceExecutor::completeValueCatchingError(GraphQLType: UserConnection,"call": "GraphQL\\Executor\\ReferenceExecutor::resolveField(GraphQLType: Query,array(1))"
        },"line": 258,"call": "GraphQL\\Executor\\ReferenceExecutor::executeFields(GraphQLType: Query,"line": 209,"call": "GraphQL\\Executor\\ReferenceExecutor::executeOperation(instance of GraphQL\\Language\\AST\\OperationDefinitionNode,null)"
        },{
          "file": "/var/www/app/vendor/webonyx/graphql-php/src/Executor/Executor.php","line": 155,"call": "GraphQL\\Executor\\ReferenceExecutor::doExecute()"
        },{
          "file": "/var/www/app/vendor/webonyx/graphql-php/src/GraphQL.php","line": 162,"call": "GraphQL\\Executor\\Executor::promiseToExecute(instance of GraphQL\\Executor\\Promise\\Adapter\\SyncPromiseAdapter,instance of GraphQL\\Type\\Schema,instance of GraphQL\\Language\\AST\\DocumentNode,"line": 94,"call": "GraphQL\\GraphQL::promiseToExecute(instance of GraphQL\\Executor\\Promise\\Adapter\\SyncPromiseAdapter,'query {\n  users (first: 2) {\n    edges {\n      node {\n        username,\n        sampleNullableDate\n      }\n    }\n  }\n}',{
          "file": "/var/www/app/vendor/api-platform/core/src/GraphQl/Executor.php","line": 34,"call": "GraphQL\\GraphQL::executeQuery(instance of GraphQL\\Type\\Schema,{
          "file": "/var/www/app/vendor/api-platform/core/src/GraphQl/Action/EntrypointAction.php","line": 78,"call": "ApiPlatform\\Core\\GraphQl\\Executor::executeQuery(instance of GraphQL\\Type\\Schema,{
          "file": "/var/www/app/vendor/symfony/http-kernel/HttpKernel.php","line": 158,"call": "ApiPlatform\\Core\\GraphQl\\Action\\EntrypointAction::__invoke(instance of Symfony\\Component\\HttpFoundation\\Request)"
        },"line": 80,"call": "Symfony\\Component\\HttpKernel\\HttpKernel::handleRaw(instance of Symfony\\Component\\HttpFoundation\\Request,1)"
        },{
          "file": "/var/www/app/vendor/symfony/http-kernel/Kernel.php","line": 201,"call": "Symfony\\Component\\HttpKernel\\HttpKernel::handle(instance of Symfony\\Component\\HttpFoundation\\Request,true)"
        },{
          "file": "/var/www/app/public/index.php","line": 25,"call": "Symfony\\Component\\HttpKernel\\Kernel::handle(instance of Symfony\\Component\\HttpFoundation\\Request)"
        }
      ]
    }
  ],"data": {
    "users": {
      "edges": [
        {
          "node": {
            "username": "user OK with date not null","sampleNullableDate": "07-09-2020 09:09:03"
          }
        },{
          "node": {
            "username": "user NOK with null date","sampleNullableDate": null
          }
        }
      ]
    }
  }
}

如何复制

遵循该文档：https://api-platform.com/docs/core/graphql/#custom-types

这是https://api-platform.com/docs/core/graphql/#custom-types

并且至少具有一个空值字段。

这是一个要复制的测试项目：https://github.com/bastoune/api-platform-test-project/tree/issue/DateTimeType