我有一个具有以下格式的文档:
{
"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" : [
]
}
}
}
我想使用 Week1 作为变量动态地将一些元素推送到 Students.Week1.Monday 中。所以我想像这样构建它:
var dbNames = ['Zoe', 'Billy', 'Joey'];
var week = Week1; // week is dynamic entry
var query1 = {};
query1['Students.' + week + '.Monday'] = '$in: ' + dbNames;
Programs.update({ _id: teacherid }, { $push: query1 });
我把事情搞砸了。任何帮助表示赞赏。
最佳答案
您可以动态创建对象来解决问题
var query = {};
var week = "DYNAMIC_VAL"; // Replace this
var day = "Monday"; // Dynamic Day
var dbNames = ['Zoe', 'Billy', 'Joey'];
query['Students'] = {};
query['Students'][week] = {};
// query['Students'][week][day] = { '$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 }, { $push: query }, callback);
关于javascript - 如何在mongo查询中动态使用$push，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44189549/