How to Construct and Pass BSON Documents in Go for MongoDB?

Constructing and Passing BSON Documents in Go with MongoDB

In your Go application, you encounter an issue where attempts to insert a BSON document using the Insert(interface{}) function in dbEngine.go result in the error: "panic: Can't marshal interface {} as a BSON document."

To resolve this issue, it's important to understand that in Go, you don't need to manually create and pass BSON documents. Instead, you can utilize the MongoDB BSON marshaling feature, which automatically converts Go structs into BSON documents.

To implement this, create a struct in account.go to represent the document you wish to insert, for example:

type Account struct {
  Id bson.ObjectId `bson:"_id"`
  BalanceAmount int
}

In your dbEngine.go, update the Insert function as follows:

func Insert(document interface{}){
  session, err := mgo.Dial("localhost")
  // error handling
  c := session.DB("db_name").C("collection_name")
  err = c.Insert(document)
}

Finally, in the main application, instantiate a Account struct, set its fields, and pass it to the Insert function:

acc := Account{}
acc.Id = bson.NewObjectId()
acc.BalanceAmount = 3

dbEngine.Insert(&acc);

By following these steps, you can simplify the BSON document handling process and avoid the error you were encountering.

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