如何動態地使用$推入蒙戈查詢

Question

我有一個具有以下格式的文檔：

{ 
"Students" : { 
    "Week1" : { 
     "Monday" : [ 

     ], 
     "Tuesday" : [ 

     ], 
     "Wednesday" : [ 

     ], 
     "Thursday" : [ 

     ], 
     "Friday" : [ 

     ], 
     "Saturday" : [ 

     ], 
     "Sunday" : [ 

     ] 
    }, 
    "Week2" : { 
     "Sunday" : [ 

     ], 
     "Monday" : [ 

     ], 
     "Tuesday" : [ 

     ], 
     "Wednesday" : [ 

     ], 
     "Thursday" : [ 

     ], 
     "Friday" : [ 

     ], 
     "Saturday" : [ 

     ] 
    }, 
    "Week3" : { 
     "Sunday" : [ 

     ], 
     "Monday" : [ 

     ], 
     "Tuesday" : [ 

     ], 
     "Wednesday" : [ 

     ], 
     "Thursday" : [ 

     ], 
     "Friday" : [ 

     ], 
     "Saturday" : [ 

     ] 
    }, 
    "Week4" : { 
     "Sunday" : [ 

     ], 
     "Monday" : [ 

     ], 
     "Tuesday" : [ 

     ], 
     "Wednesday" : [ 

     ], 
     "Thursday" : [ 

     ], 
     "Friday" : [ 

     ], 
     "Saturday" : [ 

     ] 
    }, 
    "Week5" : { 
     "Sunday" : [ 

     ], 
     "Monday" : [ 

     ], 
     "Tuesday" : [ 

     ], 
     "Wednesday" : [ 

     ], 
     "Thursday" : [ 

     ], 
     "Friday" : [ 

     ], 
     "Saturday" : [ 

     ] 
    } 
    } 
} 

我想要把一些元素融入Students.Week1.Monday動態使用Week1作爲變量。所以我想這樣構建它：

var dbNames = ['Zoe', 'Billy', 'Joey']; 
var week = Week1; // week is dynamic entry 
var query1 = {}; 
query1['Students.' + week + '.Monday'] = '$in: ' + dbNames; 
Programs.update({ _id: teacherid }, { $push: query1 }); 

我搞砸了。任何幫助表示讚賞。

Answer 1

你可以動態創建對象來解決問題

var query = {}; 
var week = "DYNAMIC_VAL"; // Replace this 
var day = "Monday"; // Dynamic Day 
var dbNames = ['Zoe', 'Billy', 'Joey']; 
query['Students'] = {}; 
query['Students'][week] = {}; 

// query['Students'][week][day] = { '$in': dBNames } // As per your query. 
// but it should not work, 
// if you want to push all elements of dbNames then you can use $each instead of $in 

query['Students'][week][day] = { '$each': dBNames }; 


//console.log(JSON.stringify(query, null, 2)); 

Programs.update({ _id: teacherid }, { $push: query }, callback);