Laravel Aggregates query not working according to group by - laravel

Question

On POS when I place any order it stored the order detail according to the product id on order_details table. I want to sum the quantity order according to product id.
Order Detail table : id, order_id, product_id, total, created_at, updated_at
Product Controller :
public function index()
{
$orderdetail = DB::table('order_details')
->select('quantity', DB::raw('sum(quantity) as sum'))
->groupBy('product_id')
->havingRaw('SUM(quantity)')
->get();
$products = Product::latest()->with('category', 'supplier', 'orderdetail')->get();
return view('admin.product.index', compact('products', 'orderdetail'));
}
On Product Model:
class Product extends Model
{
protected $dates = [
'buying_date', 'expire_date',
];
public function category()
{
return $this->belongsTo(Category::class);
}
public function supplier()
{
return $this->belongsTo(Supplier::class);
}
public function orderdetail()
{
return $this->belongsTo('App\OrderDetail', 'id', 'product_id');
}
}
}
But it does not show anything on Blade.
on Blade :
#foreach($products as $key => $product)
<tr>
<td>{{ $key + 1 }}</td>
<td>{{ $product->name }}</td>
<td>
<img class="img-rounded" style="height:35px; width: 35px;" src="{{ URL::asset("storage/product/".$product->image) }}" alt="{{ $product->name }}">
</td>
<td>{{ $product->category->name }}</td>
<td>{{ $product->supplier->name }}</td>
<td>{{ $product->code }}</td>
<td>{{ $product->buying_date->toFormattedDateString() }}</td>
<td>{{ number_format($product->buying_price, 2) }}</td>
<td>{{ number_format($product->selling_price, 2) }}</td>
<td>{{ $product->product_unit }}</td>
<td>{{ $product->product_unit - $product->sum }}</td>
<td>{{ $product->sum }}</td>
<td>DLT</td>
</tr>
#endforeach
This is the result of dd on $products and $orderdetail
It aggregates the value not showing the blade template. how I show it on the blade or there any problem on model or blade? please help.

Answer 1

Here I solved via this way
on Controller
public function index()
{
$orderdetail = DB::table('order_details')
->select('quantity', DB::raw('sum(quantity) as soldunit'))
->groupBy('product_id')
->get();
$products = Product::latest()->with('category', 'supplier', 'orderdetail')->get();
return view('admin.product.index', compact('products', 'orderdetail'));
}
and on Model, I have slightly Changed
public function orderdetail()
{
return $this->hasMany('App\OrderDetail','product_id', 'id')->selectRaw('order_details.*,sum(quantity) as soldunit')->groupBy('product_id');
}
after this, to access soldunit on the blade I used this one
{{ $product->orderdetail->sum('soldunit') }}

Answer 2

If you want to access sum of a column via a defined relationship, you need to add it during your main query:
$products = Product::with('category', 'supplier')->with(['orderdetail' => function($query){
$query->select('id', 'product_id', 'quantity', DB::raw('sum(quantity) as sum'));
}])->get();