Vapor / Fluent：过滤嵌套请求

Question

我有一个 Fluent 查询，如下所示：

            var uQuery = User.query(on: req.db)
                .filter(\.$id == user.id!)
                .with(\.$playerTournaments) {[=10=].with(\.$tournamentGames)}
                .all()

一个玩家锦标赛有多场比赛，其中包含比赛。在这种情况下，我不关心比赛，所以 $tournamentGames 允许我直接获得比赛的比赛。

但我想要的是通过@Parent 属性 $player 过滤 $tournamentGames 返回的游戏，以便只返回该玩家的游戏。我怎样才能做到这一点？我假设有一个语法

.with(\.$playerTournaments) {[=11=].with(\.$tournamentGames) { [=11=].filter(\.$id == user.id!}}

但我一直没弄明白...

编辑：对象之间的关系

User 定义多对多锦标赛：

      through: TournamentPlayerPivot.self,
      from: \.$player,
      to: \.$tournament)
    var playerTournaments: [Tournament]```

Tournament 与 Game :

之间存在互惠关系，但不在此列

      through: TournamentGamePivot.self,
      from: \.$tournament,
      to: \.$game)
    var tournamentGames: [Game]```

 Tournament is @Parent to ```Match```, which in turn parents ```Game```. Match manages a bunch of non-user-facing stuff to do with determining when tournaments end, but are in the way here.

A ```Game``` has a $player field, which contains the uuid of the User assigned to play it. And a Tournament has an $owner, guaranteed to to be a player/User. Both are one to one.

More questions, happy to answer.

Answer 1

您有两个选择 - 您要么急切加载所有数据并使用数组过滤器过滤 Swift 中的关系，要么使用连接。联接将更加高效，因为它们只会 return 您想要的，并且数据库旨在尽可能高效地执行它们（至少 SQL 数据库）。

联接的文档是 https://docs.vapor.codes/4.0/fluent/query/#join

Vapor / Fluent：过滤嵌套请求

Vapor / Fluent: filtering nested requests

postgresql

fluent

ios

swift

vapor