使用mongoose更新mongo中的二級數組返回意外標記「。」

Question

我有他的模型：

var field = { 
    questionSets: [ 
     { 
      name : "", 
      questions: [ 
       { 
        question: {type: String, required: true}, 
        answer: {type: String}, 
       } 
      ] 
     } 
    ] 
} 

而這個查詢：

SubjectiveForm.update(
    {_id:doc._id, questionSets.$._id:req.params.set_id}, 
    {$pushAll: {questions:req.body}}, 
    {upsert:true}, 
    function(err, questions){ 
     console.log("err", err); 
     console.log("err", questions); 
    } 
) 

，但此行{_id:doc._id, questionSets.$._id:req.params.set_id},上questionSets.$返回Unexpected token .。

BTW的req.body看起來是這樣的（一個JSON）：

[ 
    { 
     "question" : "Added 1?" 
    }, 
    { 
     "question" : "Added 2?" 
    } 
] 

Answer 1

由於questionSets.$._id是JSON對象的關鍵，你提供的更新查詢，它應該是'questionSets.$._id'（帶引號），它不能有鑰匙包括點在內

SubjectiveForm.update(
    {_id:doc._id, 'questionSets.$._id':req.params.set_id}, 
    {$pushAll: {questions:req.body}}, 
    {upsert:true}, 
    function(err, questions){ 
     console.log("err", err); 
     console.log("err", questions); 
    } 
)