使用mongo-go-driver和接口将光标反序列化为数组

I create an api using golang, i would like to create some functionnal test, for that i create an interface to abstract my database. But for that i need to be able to convert the cursor to an array without knowing the type.

func (self *KeyController) GetKey(c echo.Context) (err error) {
    var res []dto.Key
    err = db.Keys.Find(bson.M{}, 10, 0, &res)
    if err != nil {
        fmt.Println(err)
        return c.String(http.StatusInternalServerError, "internal error")
    }
    c.JSON(http.StatusOK, res)
    return
}
//THE FIND FUNCTION ON THE DB PACKAGE
func (s MongoCollection) Find(filter bson.M, limit int, offset int, res interface{}) (err error) {
    ctx := context.Background()
    var cursor *mongo.Cursor
    l := int64(limit)
    o := int64(offset)
    objectType := reflect.TypeOf(res).Elem()
    cursor, err = s.c.Find(ctx, filter, &options.FindOptions{
        Limit: &l,
        Skip:  &o,
    })

    if err != nil {
        return
    }

    defer cursor.Close(ctx)

    for cursor.Next(ctx) {
        result := reflect.New(objectType).Interface()
        err := cursor.Decode(&result)
        if err != nil {
            panic(err)
        }
        res = append(res.([]interface{}), result)

    }
    return
}

Does someone have an idea?

You can call directly the "All" method:

ctx := context.Background()
err = cursor.All(ctx, res)
if err != nil {
    fmt.Println(err.Error())
}

For reference:

https://godoc.org/go.mongodb.org/mongo-driver/mongo#Cursor.All