[go-nuts] Generalize a method (mgo)

I'm trying to get getObj() function will be more general and could work
with any type, not only User like in my code. I was thinking in return a
interface instead a defined struct, but I can't fit this idea to my code,
please could someone give me a hand with this?
Thanks in advance

type User struct {
FirstName string `bson:"first_name"`
LastName string `bson:"last_name"`}

type Mbase struct {
coll *mgo.Collection
sess *mgo.Session}

func (b *Mbase) getObj(attr string, val string) (res *User, err error) {
err = b.coll.Find(bson.M{attr: val}).One(&res)
if err != nil {
return
}
err = nil
return}

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