package main

import (
    "fmt"
    "labix.org/v2/mgo"
    "labix.org/v2/mgo/bson"
)

type TestDataSub struct {
    X int
    Y int
}
type TestData struct {
    Foo string
    Bar TestDataSub
}

type Magic struct {
    //data string
}

func (*Magic) SetBSON(raw bson.Raw) error {
    var m map[string]interface{}
    if err := raw.Unmarshal(&m); err != nil {
        return err
    }
    fmt.Printf("%#v\n", m)
    return nil
}

func main() {
    session, err := mgo.Dial("localhost")
    if err != nil {
        panic(err)
    }
    defer session.Close()

    // Optional. Switch the session to a monotonic behavior.
    session.SetMode(mgo.Monotonic, true)

    c := session.DB("test").C("magic")
    err = c.Insert(&TestData{"abcd", TestDataSub{1, 2}})
    if err != nil {
        panic(err)
    }

    result := Magic{}
    err = c.Find(bson.M{"foo": "abcd"}).One(&result)
    if err != nil {
        panic(err)
    }
}