Auto type assertion not working when fetching data

[voidhofer]

I switched from go-mgo/mgo.v2 to this as it was advised by many but I found an odd problem.
While in go-mgo's version it was possible to fetch results to a struct object with this package it is not possible.

Every time I use "c.Find(nil).One(&result)" to fetch data into a struct I get an empty struct.
I have to manually marshal and unmarshal the data to get it into a struct otherwise it will not work.

Example:

type Menu struct {
    ID       bson.ObjectId 'json:"_id" bson:"_id"'
    Value string                'json:"val" bson:"val"'
}

func GetData() (Menu, error) {
        var err error
        var result interface{}
        var resultMenu Menu
        if database.CheckConnection() {
		session := database.Mongo.Copy()
		defer session.Close()
		c := session.DB(database.ReadConfig().MongoDB.Database).C("menus")
		err = c.FindId(bson.ObjectIdHex("5b6d851c9d8c2119e3667a99")).One(&result) // using resultMenu instead of result will return an empty Menu object
	} else {
		err = ErrUnavailable
	}
	bsonBytes, _ := bson.Marshal(result)         // have to manually marshal and unmarshal data
	bson.Unmarshal(bsonBytes, &resultMenu)
	return resultMenu, standardizeError(err)
}