在这里，我需要清楚地说明我的问题。我如何编写查询以使用mongoose和nodejs检索符合条件的每个子文档数组。
这是我现有的JSON：
[
{
_id: "568ccd6e646489f4106470ec",
area_name: "Padi",
warehouse_name: "Hapserve Online Water Service",
name: "Ganesh",
email: "[email protected]",
mobile_no: "9042391491",
otp: "4466",
__v: 0,
date: "06-01-2016",
booking:
[
{
can_quantity: "4",
delivery_date: "06-01-2016",
delivery_timeslot: "10am-3pm",
subscription: "true",
subscription_type: "Weekly",
total_cost: "240",
order_id: "S13833",
can_name: "Tata Waters",
address: "15/A,Ramanrajan street,,Padi,Chennai",
can_cost: "240",
_id: "568ccd6e646489f4106470ee",
ordered_at: "2016-01-06T08:16:46.825Z",
status: "UnderProcess"
},
{
can_name: "Bisleri",
can_quantity: "4",
can_cost: "200",
delivery_date: "11-01-2016",
delivery_timeslot: "3pm-8pm",
order_id: "11537",
address: "27,Main Street,Padi,Chennai",
_id: "5693860edb988e241102d196",
ordered_at: "2016-01-11T10:38:06.749Z",
status: "UnderProcess"
}
]
},
{
_id: "56937fb8920629a0164604d8",
area_name: "Poonamallee",
warehouse_name: "Tata Waters",
name: "M.Kalaiselvan",
email: "[email protected]",
mobile_no: "9003321521",
otp: "2256",
__v: 0,
date: "2016-01-11T10:11:04.266Z",
booking:
[
{
can_quantity: "4",
delivery_date: "06-01-2016",
delivery_timeslot: "10am-3pm",
subscription: "true",
subscription_type: "Alternate",
total_cost: "640",
order_id: "S13406",
can_name: "Kinley",
address: "133,Bajanai koil street, Melmanagar,Poonamallee,Chennai",
can_cost: "160",
_id: "56937fb8920629a0164604da",
ordered_at: "11-01-2016",
status: "UnderProcess"
},
{
can_name: "Tata Waters",
can_quantity: "2",
can_cost: "120",
delivery_date: "11-01-2016",
delivery_timeslot: "10am-3pm",
order_id: "11387",
address: "140,Bajanai koil street, Melmanagar,Poonamallee,Chennai",
_id: "56937ff7920629a0164604dc",
ordered_at: "2016-01-11T10:12:07.719Z",
status: "UnderProcess"
},
{
can_name: "Bisleri",
can_quantity: "4",
can_cost: "200",
delivery_date: "12-01-2016",
delivery_timeslot: "10am-3pm",
order_id: "16853",
address: "140,Bajanai koil street, Melmanagar,Poonamallee,Chennai",
_id: "56938584db988e241102d194",
ordered_at: "2016-01-11T10:35:48.911Z",
status: "UnderProcess"
},
{
can_name: "Hapserve",
can_quantity: "6",
can_cost: "150",
delivery_date: "11-01-2016",
delivery_timeslot: "10am-3pm",
order_id: "17397",
address: "133,Bajanai koil street, Melmanagar,Poonamallee,Chennai",
_id: "569385bbdb988e241102d195",
ordered_at: "2016-01-11T10:36:43.918Z",
status: "UnderProcess"
},
{
can_name: "Bisleri",
can_quantity: "5",
can_cost: "250",
delivery_date: "11-01-2016",
delivery_timeslot: "10am-3pm",
order_id: "14218",
address: "133,Bajanai koil street, Melmanagar,Poonamallee,Chennai",
_id: "56939a13c898ef7c0cc882b0",
ordered_at: "2016-01-11T12:03:31.324Z",
status: "Cancelled"
}
]
}
]
在这里，我需要检索交货日期为今天的每个文档
所以这是我的nodejs路线
router.get('/booking-date/:date', function(req, res){
var id = req.params.date;
RegisterList.find({'booking.delivery_date':id}, {'booking.$':1}, function(err, docs){
if(err)
throw err;
res.json(docs);
});
});
在使用此功能时，无法获取所有数据。从集合中仅检索两个数据。
例如，如果我搜索日期11-01-2016，则每个父级ID仅获得一个子文档，但在日期11-01-2016的上述json中。一个父ID在该日期具有2个子文档，而另一个父ID在该日期具有1个子文档。
无法将猫鼬查询检索写到已完成匹配的每个子文档中。
像你这样的声音可能想尝试的聚合框架，您可以$project使用带有过滤器的预订阵列成为可能$setDifference，$map和$cond运营商。
该$map运营商考察中的每个元素booking阵列和$cond运营商只返回基于一个真实的condtion通缉领域，一个假值相反，而不是数组元素返回。$setDifference然后，运算符通过与另一个具有[false]值的集合进行比较，从数组中删除所有错误值，最终结果只是返回的匹配项：
router.get('/booking-date/:date', function(req, res){
var id = req.params.date,
pipeline = [
{
"$match": { 'booking.delivery_date': id }
},
{
"$project": {
"booking": {
"$setDifference": [
{
"$map": {
"input": "$booking",
"as": "el",
"in": {
"$cond": [
{ "$eq": [ "$$el.delivery_date", id ] },
"$$el",
false
]
}
}
},
[false]
]
}
}
}
];
RegisterList.aggregate(pipeline, function(err, docs){
if(err) throw err;
res.json(docs);
});
});
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