List of interfaces in mgo/bson (go-mgo/mgo#69)

main.go

package main

import (
	"gopkg.in/mgo.v2"
	"gopkg.in/mgo.v2/bson"
	"log"
)

type MyInterface interface {
	Hello()
}

type MyType struct {
}

func (x MyType) Hello() {
	log.Println("Hello!")
}

type MyList []MyInterface

func (ml MyList) SetBSON(interface{}) error {
	log.Println("In GetBSON")
	ml = make([]MyInterface, 1)
	ml[0] = MyType{}
	return nil
}

type MyDocument struct {
	List MyList
}

func main() {
	session, err := mgo.Dial("db")
	if err != nil {
		log.Fatalf("Unable to open MongoDB session: %s", err)
	}

	database := session.DB("my_db")
	collection := database.C("my_collection")

	var doc MyDocument
	doc.List = MyList{
		MyType{},
	}

	err = collection.Insert(doc)
	if err != nil {
		log.Fatalf("insert: %s", err)
	}

	err = collection.Find(bson.M{}).One(&doc)
	if err != nil {
		log.Fatalf("find: %s", err)
	}
}