在meteor.js中，如何在AutoForm.addHooks的onSuccess函数中使用template参数来获取模板数据上下文？

I attach the document as the data context of addCrop template. When the autoform in it is submitted successfully, I want to get the _id in this data context. I am assuming that I can get it from template parameter. But, I do not know how to do it. I attach the document as the data context of ad