将MYSQL查询转换为Eloquent Laravel

Question

this is my MYSQL query:

SELECT product_tasks.id AS product_task_id,
       tasks.id AS tasks_id,
       tasks.task_name AS label,
       tasks.serial_id AS serial_id,

  (SELECT serials.starting_series
   FROM serials
   WHERE serials.id = serial_id) AS starting_series
FROM product_tasks
JOIN tasks ON tasks.id = product_tasks.task_id
WHERE product_tasks.product_id = 1;

AND this is my eloquent query but I haven't finished with it:

ProductTask::select('product_tasks.id as product_task_id', 
                    'tasks.id as tasks_id', 'tasks.task_name as label', 
                    'tasks.serial_id as serial_id', * INSERT missing query here *)
            ->JOIN('tasks', 'tasks.id', 'product_tasks.task_id') 
            ->WHERE('product_tasks.product_id', 1) 
            ->get();

what is the missing part in my eloquent query?

Answer 1

Use DB:raw()

ProductTask::select(
 'product_tasks.id as product_task_id',
 'tasks.id as tasks_id',
 'tasks.task_name as label',
 'tasks.serial_id as serial_id',
 DB::raw("SELECT serials.starting_series as starting_series FROM serials WHERE serials.id = serial_id")) 
 ->join('tasks', 'tasks.id', 'product_tasks.task_id')
 ->where('product_tasks.product_id', 1)
 ->get();