我的结构是这样的:
test{
_id: 60eadb64b72caa2ae419e085,
testid: 'hh',
time: 45,
testPassword: 123,
startTime: 2021-07-11T11:52:04.245Z,
Students: [
{
_id: 60eadb98b72caa2ae419e088,
submission: '#*#org 0h #*##*#ret#*#',
familyName: 'dsc',
firstName: 'ccccc',
group: 2,
time: 0.8772833333333333
},
{
_id: 60eadbb5b72caa2ae419e08c,
submission: '#*#org 0h #*##*#ret#*#',
familyName: 'eqf',
firstName: 'aaaaa',
group: 56,
time: 1.357
}
],
__v: 0
}
我只想从这样的学生数组中获取具有 _id: 60eadb98b72caa2ae419e088 的对象
{
_id: 60eadb98b72caa2ae419e088,
submission: '#*#org 0h #*##*#ret#*#',
familyName: 'dsc',
firstName: 'ccccc',
group: 2,
time: 0.8772833333333333
}
答案 0 :(得分:0)
您可以像这样在猫鼬中搜索对象数组
db.collection.find({"Students._id": yourId})
你可以深入到你想要的地方
db.collection.find({"Students.users.info.name": username})
对于单个匹配,您可以像这样使用 findOne
db.collection.findOne({"Students._id": yourId})
如果你只想要Students数组中的对象,你可以通过javascript find
函数找到它
const wantedObject = myObj.Students.find(e => e._id === "60eadb98b72caa2ae419e088")
答案 1 :(得分:0)
您可以使用以下聚合来查找所需的结果,我在本地尝试过它工作正常
db.users.aggregate([
{
$match:{
"Students._id":ObjectId("60eadb98b72caa2ae419e088")
}
},{
$unwind:"$Students"
},
{
$project: {
submission:"$Students.submission",
_id:"$Students._id",
familyName:"$Students.familyName",
firstName:"$Students.firstName",
group:"$Students.group",
time:"$Students.time",
}
},
{
$match:{
_id:ObjectId("60eadb98b72caa2ae419e088")
}
}
]);