type AB struct

{ A int32 bson:"A" B int32 bson:"B" }

func TestSort(t *testing.T) {
mongodb.Init()
defer mongodb.Close()

mongodb.GetTrainingDB().Collection("TestSort").Drop(context.Background())

for i := 0; i < 5; i++ {
mongodb.GetTrainingDB().Collection("TestSort").InsertOne(context.Background(), bson.M

{"A": i, "B": rand.Int31n(10)}

)
mongodb.GetTrainingDB().Collection("TestSort").InsertOne(context.Background(), bson.M

{"A": i, "B": rand.Int31n(10)}

)
}

for i := 0; i < 100; i++ {
sortABList := []AB{}
theOption := options.Find().SetSort(bson.M

{"A": -1, "B": -1}

)
theCur, _ := mongodb.GetTrainingDB().Collection("TestSort").Find(context.Background(), bson.M{}, theOption)
defer theCur.Close(context.Background())

for theCur.Next(context.Background())

{ var theValue AB theCur.Decode(&theValue) sortABList = append(sortABList, theValue) }

for i := 0; i < len(sortABList)-1; i++ {
fmt.Println(sortABList[i])
if sortABList[i].A < sortABList[i+1].A

{ t.Fatalf("sort error! %d less then %d", sortABList[i].A, sortABList[i+1].A) }

}
fmt.Println()
}

}