Godeps/_workspace/src/gopkg.in/mgo.v2/session.go
func (c *Collection) UpdateId(id interface{}, update interface{}) error {
	return c.Update(bson.D{{"_id", id}}, update)
}
func (c *Collection) UpdateId(id interface{}, update interface{}) error {
	return c.Update(bson.D{{"_id", id}}, update)
}
func ( c * Collection ) UpdateId ( id interface { } , update interface { } ) error { return c . Update ( bson . D { { " " , id } } , update ) }
// UpdateId is a convenience helper equivalent to:
//
//     err := collection.Update(bson.M{"_id": id}, update)
//
// See the Update method for more details.
UpdateId is a convenience helper equivalent to : err : = collection . Update ( bson . M { _id : id } update ) See the Update method for more details .