getting docs by a foreign key

rethinkdb_join.py

products = (
            await r.table("saved")
            .order_by(r.desc("saved_at"))
            .filter(r.row["user_id"] == user_id)
            .eq_join("product_id", r.table("products"))
            .map(lambda doc: doc["right"].merge(make_merge_expr))
            .limit(25)
            .run(self.conn)
        )

products = (
    await r.table("saved")
    .order_by(r.desc("saved_at"))
    .filter(r.row["user_id"] == user_id)
    .eq_join("product_id", r.table("products"))["right"]
    .merge(make_merge_expr)
    .limit(25)
    .run(self.conn)
)

# if concat_map use get_all
products = (
    await r.table("saved")
    .order_by(r.desc("saved_at"))
    .filter(r.row["user_id"] == user_id)
    .map(lambda save: r.table("products").get(save["product_id"]))
    .merge(make_merge_expr)
    .limit(25)
    .run(self.conn)
)