Should I Use `interface{}` for BSON Documents in Go?

Passing BSON Documents Using Go

When working with Go and MongoDB using the mgo package, it's common to encounter challenges while passing BSON documents. This article addresses one such issue, particularly focusing on the question of whether or not to use interface{} for BSON documents.

Problem:

You have created a BSON document, but when attempting to pass it to a function in another package that takes the type interface{}, you encounter the error: "panic: Can't marshal interface {} as a BSON document."

Solution:

Your issue stems from the fact that you should not be creating BSON documents yourself. Instead, you can define a struct to represent the schema of your document and then use the mgo package to handle the marshaling and unmarshaling of BSON data.

In account.go:

Define a struct representing your account:

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

In dbEngine.go:

Update the Insert function to accept an interface{} argument:

func Insert(document interface{}) {
  // Establish connection, get collection
  session, err := mgo.Dial("localhost")
  c := session.DB("db_name").C("collection_name")
  err = c.Insert(document)
  // Handle any potential errors
}

In your main application:

Create an instance of the Account struct and insert it into the database:

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

This approach allows mgo to properly handle the encoding and decoding of BSON documents, eliminating the need for manual handling.

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