Neos Flow ActionController 返回JSON

1. 在ActionController里添加protected $supportedMediaTypes = ['application/json', 'text/html' ];

2. return json_encode($dashboard); 或者使用JSON View

            /**
            * @var string
            */
           protected $viewFormatToObjectNameMap = array(
                   'html' => 'TYPO3\Fluid\View\TemplateView',
                   'json' => 'TYPO3\Flow\Mvc\View\JsonView'
           );
   ...
    $this->view->assign('value', $dashboard);

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