How to multiply and group using laravel eloquent with relation - mysql

Question

I'd like to export data from my database but have problems with multiplying and sum using laravel eloquent with relation
So i have 2 tables there (budgets, items)
Budget's:
// Table
+----+---------------+-----------------+------+-----+--------------------+
| id | delivery_plan | item_code | curr | qty | price |
+----+---------------+-----------------+------+-----+--------------------+
| 1 | 2022-08 | 201.0001 | IDR | 1 | 2000.0000000000 |
| 2 | 2022-08 | 201.0001 | IDR | 3 | 2000.0000000000 |
| 3 | 2022-07 | 201.9999 | IDR | 2 | 2000.0000000000 |
+----+---------------+-----------------+------+-----+--------------------+
// Relation
public function item()
{
return $this->belongsTo(Item::class, 'item_code', 'item_code');
}
Items :
// Table
+----+----------------+-----------+
| id | subgroup | item_code |
+----+----------------+-----------+
| 1 | KOMPONEN MESIN | 201.0001 |
| 2 | EQUIPMENT LAIN | 201.9999 |
+----+----------------+-----------+
// Relation
public function budgets()
{
return $this->hasMany(Budget::class, 'item_code', 'item_code');
}
So, the scenario is :
Multiply the "qty" * "price" columns and name them as "total" like so
Group them by "subgroup" column, which came from item() relationship
Group them by "delivery_plan"
I prefer using eloquent because to minimize the complexity because i need that "whereHas" method
This is what i've tried so far and isn't working :
$budgets = Budget::with('item', 'rate')->whereHas('period.term', function (Builder $builder) {
$builder->where('name', '=', Session::get('term-budget'));
})->where('section', Session::get('section-budget'))->getQuery();
$result = $budgets->sum('price * qty')->get();
How can i achieve this ?

Answer 1

This can be solved by a join with SUM(), something like below (untested):
Budget::leftJoin('items', 'budgets.item_code', '=', 'items.item_code')
->addSelect('subgroup')
->addSelect('delivery_plan')
->addselect(\DB::raw('SUM(qty * price) as total'))
->groupBy('subgroup', 'delivery_plan')
->get();