Laravel雄辩地带有“ with”和“ wherehas”

Question

假设我有三个与外键链接的数据库，即玩家，信用和照片。

player
id | name | address

credit
id | player_id | credit_status

photo
id | player_id

假设我想获得所有具有credit_status $ status的玩家，我会这样做：

$status = 'bar';
Player::with('photo','credit')->whereHas('credit', function ($q) use ($status) {
            $q->where('credit_status', $status)->with('credit_status');
        })->paginate(15);

这将列出所有具有credit_status $ credit的玩家，但仍然列出该玩家的所有积分，而不管其状态如何。

输出类似于：

{
id: 1
name: Andrew
address: home
photo: {
          id: 2
          photo: image1
       }
credit: {
          [
              {
              id: 6
              credit_status: foo,
              id: 2
              credit_status: bar
              }
          ]
        }
},
{
id: 2
name: Mark
address: home
photo: {
          id: 5
          photo: image4
       }
credit: {
          [
              {
              id: 10
              credit_status: foo,
              id: 6
              credit_status: bar,
              id: 8
              credit_status: bar
              }
          ]
        }
}

我也想用（'credit'）过滤信用。我想要的输出：

{
id: 1
name: Andrew
address: home
photo: {
          id: 2
          photo: image1
       }
credit: {
          [
              {
              id: 2
              credit_status: bar
              }
          ]
        }
},
{
id: 2
name: Mark
address: home
photo: {
          id: 5
          photo: image4
       }
credit: {
          [
              {
              id: 6
              credit_status: bar,
              id: 8
              credit_status: bar
              }
          ]
        }
}

Answer 1

您可以对with（限制急切加载）执行相同的过滤：

$creditFilter = function ($q) use ($status) {
    $q->where('credit_status', $status);
};

Player::with(['photo', 'credit' => $creditFilter])
    ->whereHas('credit', $creditFilter)
    ->paginate(15);

您可以保存该闭包并将其传递给with，whereHas因此不必两次键入相同的闭包。

Laravel 5.6文档-雄辩-关系-渴望加载-限制渴望加载