How to Pass BSON Documents to Functions in Go with mgo?

Passing BSON Documents in Go Lang

In Go, you can connect to MongoDB and manipulate data using the mgo library. To insert documents into MongoDB, you need to construct BSON documents, which represent the data you want to store.

When passing a BSON document to a function in another package (e.g., dbEngine.go), you may encounter an error when using the interface{} type. This is because mgo expects a specific type to map to the BSON document structure.

Instead of creating BSON documents manually, it's recommended to use a Go struct to define the shape of the data you want to insert. For example, in account.go, you can create a struct like:

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

Then, in dbEngine.go, you can update your Insert function to accept a pointer to the struct:

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

Finally, you can use the struct to create a new account and insert it into MongoDB:

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

dbEngine.Insert(&acc);

By using a struct, you ensure that the data is properly formatted and compatible with the BSON document structure required by MongoDB.

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