Mongodb 获取Mongo集合字段的值以代替ObjectId

字段的值引用其他集合的文档 每个对象Id引用不同的集合文档 我们需要编写一个查询以从该文档中获取特定字段值

示例输出

collection{{
"_id":ObjectId("as123dhfud638djkj87"),
field1:ObjectId("as123dhfud63843562"),
field2:ObjectId("as123dhfud63893758"),
field3:ObjectId("as123dhfud63803957")
},
{
"_id":ObjectId("as123dhfud638djkj88"),
field1:ObjectId("as123dhfud63843543"),
field2:ObjectId("as123dhfud63893098"),
field3:ObjectId("as123dhfud63800987")
}

---

请添加一个示例输出？

{
"_id":ObjectId("as123dhfud638djkj87"),
field1:"Karthik",
field2:"CSE",
field3:"21"
},
{
"_id":ObjectId("as123dhfud638djkj88"),
field1:"Ramu",
field2:"ECE",
field3:"22"
}