laravel sum and group by in sub query - php

Question

I have this query
$t_items_between = TransferItem::whereHas('transfer', function ($query) use($old_until_date, $inventory_id, $old_from_date_interval) {
$query->where('document_date', '>=', $old_from_date_interval);
$query->where('document_date', '<=', $old_until_date);
$query->where('to_inventory_id', $inventory_id);
})
->with(['transfer' => function($query) use($old_until_date, $inventory_id, $old_from_date_interval) {
$query->where('document_date', '>=', $old_from_date_interval);
$query->where('document_date', '<=', $old_until_date);
$query->where('to_inventory_id', $inventory_id);
}
])
->whereIn('item_id', $subset)
->addSelect(['quantity' => TransferItem::selectRaw('sum(quantity)')
->groupBy('item_stock_id')
->from((new TransferItem)->getTable() . ' as ti')
->whereColumn('ti.item_stock_id', (new TransferItem)->getTable() . '.item_stock_id')
])
->get();
So TransferItem is the model of the table transfer_items. transfer_items has 4 columns: id, transfer_id, item_stock_id and quantity.
What I am trying to do is to sum the quantity of each result, grouping by the item_stock_id, but the query above doesn't work. How would I approach it?

Answer 1

try using map
$t_items_between = TransferItem::whereHas('transfer', function ($query) use($old_until_date, $inventory_id, $old_from_date_interval) {
$query->where('document_date', '>=', $old_from_date_interval);
$query->where('document_date', '<=', $old_until_date); $query->where('to_inventory_id', $inventory_id);
})
->with(['transfer' => function($query) use($old_until_date, $inventory_id, $old_from_date_interval) {
$query->where('document_date', '>=', $old_from_date_interval);
$query->where('document_date', '<=', $old_until_date); $query->where('to_inventory_id', $inventory_id);
}
])
->whereIn('item_id', $subset)
->get()
->groupBy('item_stock_id')
->map(function ($q) {
return $q->sum('quantity');
});
Visit https://laravel.com/docs/9.x/collections