Question

我想按日拉出认捐的NPC。但是，为此，我需要使用地牢名称。 İ有3张桌子。

Npcs表：

id  |  name
-----------
1   | NPC 1
2   | NPC 2
3   | NPC 3

地下城表

id  |  name
---------------
1   | Dungeon 1
2   | Dungeon 2
3   | Dungeon 3
4   | Dungeon 4
5   | Dungeon 5
6   | Dungeon 6

认捐表

id  |  npc_id  |  dungeon_id  |  date
------------------------------------------
1   | 1        | 1            | 2019-05-26
2   | 2        | 2            | 2019-05-26
3   | 3        | 3            | 2019-05-26
4   | 1        | 4            | 2019-05-27
5   | 2        | 5            | 2019-05-27
6   | 3        | 6            | 2019-05-27

我的控制器代码；

public function index()
{
    $y = Carbon::yesterday('Europe/London');
    $t = Carbon::today('Europe/London');
    $time = Carbon::now('Europe/London');
    $yesterday = Carbon::create($y->year, $y->month, $y->day, 10, 0, 0); //set time to 10:00
    $today = Carbon::create($t->year, $t->month, $t->day, 10, 0, 0); //set time to 10:00
    if($time->between($yesterday, $today, true)) {
        $pledges = Npc::join('pledges', function ($join) {
            $join->on('npcs.id', '=', 'pledges.npc_id')
                ->where('pledges.date', '=', Carbon::yesterday('Europe/London'));
        })
            ->get();
        return $pledges;
    } else {
        $pledges = Npc::join('pledges', function ($join) {
            $join->on('npcs.id', '=', 'pledges.npc_id')
                ->where('pledges.date', '=', Carbon::today('Europe/London'));
        })
            ->get();
        return $pledges;
    }
}

这段代码为我提供了以下结果。

0
id  5
name    "NPC 1"
created_at  "2019-05-27 11:35:27"
updated_at  "2019-05-27 11:35:27"
npc_id  1
dungeon_id  1
date    "2019-05-27"

但是我需要这个结果的地牢名称。

Answer 1

您应该使用其他联接+选择。试试这个。

public function index()
{
    $time = Carbon::now('Europe/London');
    $yesterday = Carbon::yesterday('Europe/London')->setTime(10, 0, 0);
    $today = Carbon::today('Europe/London')->setTime(10, 0, 0);

    if($time->between($yesterday, $today, true)){
        $date = $yesterday;
    } else {
        $date = $today;
    }

    $pledges = Npc::select('npcs.*', 'dungeons.id as dungeon_id', 'dungeons.name as dungeon_name')
        ->join('pledges', function($join) use ($date) {
            $join->on('npcs.id', '=', 'pledges.npc_id')->where('date', $date);
        })
        ->join('dungeons', 'dungeons.id', '=', 'pledges.dungeon_id')
        ->get();

    return $pledges;
}

Laravel如何通过关系进行子联接

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