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var question = new Schema({
  question: String,
  answer: [{ body: String}]
})

在数据库中添加“答案”?

编辑:-

我正在尝试:-但它说:-Cannot apply $push/$pushAll modifier to non-array

questionModel.findByIdAndUpdate(ans.id, 
            { $push: { answer: { body: ans.answer.body} } },
            function(err){ if(err){ 
           console.log(err) 
         } else { 
            console.log('Added')
         }
      });
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