MongoDB扩展嵌入式文档

Question

I have a mongo document as follows:

{
  _id: ... ,
  field_1: ...,
  field_2: ...,
  changes:{
    "1474607149339":"a7hhs",
    "1474607149463":"98nhs",
    "1474607149657":"cxskk9",
    "1474607149880":"csdda3",
    "1474607151575":"bfddrd",
    "1474607153389":"54fbbb",
  }
}

The big numbers in the changes are timestamp values. (this is to track history of certain fields in my application). I'm sending this changes as small chunks containing few similar entries eg:

{
        "1474607159708":"zcdgv",
        "1474607159932":"4h7kk",
        "1474607165362":"nbmnn"
}

how can I extend the changes field in the mongo document to include new changes in a single query (large number of changes need to be recoreded)?

Answer 1

You should be able to insert fields into existing documents using the $set operator: https://docs.mongodb.com/manual/reference/operator/update/set/

db.products.update(
   { _id: 100 },
   { $set: { 
              "changes.1474607159708": "zcdgv",
              "changes.1474607159932": "4h7kk",
              ....
           } 
   }
)