我有一个集合“superpack”，其中包含嵌套对象。示例文档如下所示。
{
"_id" : ObjectId("56038c8cca689261baca93eb"),
"name": "Test sub",
"packs": [
{
"id": "55fbc7f6b0ce97a309b3cead",
"name": "Classic",
"packDispVal": "PACK",
"billingPts": [
{
"id": "55fbc7f6b0ce97a309b3ceab",
"name": "Classic 1 month",
"expiryVal": 1,
"amount": 20,
"topUps": [
{
"id": "55fbc7f6b0ce97a309b3cea9",
"name": "1 extra",
"amount": 8
},
{
"id": "55fbc7f6b0ce97a309b3ceaa",
"name": "2 extra",
"amount": 12
}
]
},
