type BaseMongo interface {
    Read(ctx context.Context, filter bson.M, db string, collection string, out interface{}) error
}

type Mongo struct {
    client *mongo.Client
}

func (m *Mongo) Read(ctx context.Context, filter bson.M, db string, collection string, out interface{}) error {
    return m.client.Database(db).Collection(collection).FindOne(context.Background(), filter).Decode(out)
}