Laravel渴望用自定义查询加载嵌套关系

Question

我有可以工作的代码，但不需要急于加载嵌套关系。

$projects = Project::with('organization')
        ->leftJoin('stages', 'stages.project_id', '=', 'projects.id')
        ->leftJoin('activities', 'activities.stage_id', '=', 'stages.id')
        ->leftJoin('tasks', 'tasks.activity_id', '=', 'activities.id')
        ->select('projects.*',  DB::raw('SUM(IF(tasks.status = 4, score, 0)) AS score'), 
                                DB::raw('SUM(tasks.score) AS total_score'))
        ->groupBy('projects.id')
        ->get();

我想用热切加载嵌套关系来实现这一点，如果我没有这些自定义选择（total_score和score），我会进行

$projects = Project::with('stages.activities.tasks');

但问题出现在那些自定义选择（score和total_score）上。我试过类似的方法，但没有成功

$projects = Project::with(['stages', 'activities', 'tasks' => function($q) { 
        $q->select( DB::raw('SUM(IF(tasks.status = 4, score, 0)) AS score'), 
                    DB::raw('SUM(tasks.score) AS total_score')); 
    }])->get();

Answer 1

类似的东西应该会起作用：

$projects = $project::with(array('stages' => function($q)
 {
   $q->with(array('activities' => function($q)
   {
     $q->with(array('tasks' => function($q)
     {
        $q->groupBy('tasks.id');
        $q->addselect([
            DB::raw('SUM(IF(tasks.status = 4, score, 0)) AS score'),
            DB::raw('SUM(tasks.score) AS total_score')
            ]);
       }));
     }));
   }))
 ->get();

如果您的函数function($q) use ($arg)需要更多的参数。