Laravel 8 relationship search returning empty result - laravel

Question

I have this query:
$orders = Order::with(['company', 'products', 'user', 'status', 'seller'])->orderBy('id', 'DESC')->select('orders.*');
And it returns the relevant results as expected in a yajra datatable instance.
Now I would like to narrow down this result even more. I use it this way:
$orders = $orders->whereHas('user', function ($q) use ($request){
$q->searchFullName($request->seller);
});
I have created a scope in the model and it works for another function on my website. However it returns no results when calling it like that.
Even if I call the whereHas using a where statement, still the result is empty:
$orders = $orders->whereHas('user', function ($q) use ($request){
$q->where('first_name', 'like', '%'.$request->seller.'%');
});
The seller parameter is not empty. Even if I use a hardcoded string, the results are always empty.
The searchFullName method:
public function scopesearchFullName($query, $value){
return $query->where('first_name', 'LIKE', "%$value%")
->orWhere('middle_name', 'LIKE', "%$value%")
->orWhere('last_name', 'LIKE', "%$value%");
}
Full controller:
public function listOrdersData(Request $request)
{
if(!$request->ajax())
return Redirect::route('/');
$loggedUser = Auth::user();
if($loggedUser->hasRole('Super Administratör'))
$orders = Order::with(['company', 'products', 'user', 'status', 'seller'])->orderBy('orders.id', 'DESC')->select('orders.*');
else
$orders = Order::with(['company', 'products', 'user', 'status', 'seller'])->where('company_id', $loggedUser->company_id)->orderBy('id', 'DESC')->select('orders.*');
if (!empty($request->seller) && $request->seller != 'all') {
$orders = $orders->whereHas('user', function ($q) use ($request){
$q->searchFullName($request->seller);
});
}
return DataTables::of($orders)
->addColumn('products', function($orders) {
$products = "";
foreach($orders->products as $product)
$products = $products . $product->name . "<br>";
return $products;
})
->editColumn('company', function($orders){ return $orders->company->name; })
->editColumn('price', '{{$price}} kr')
->editColumn('user', function($orders){
return $orders->user->full_name;
})
->addColumn('seller', function($orders){
return $orders->seller->full_name;
})
->addColumn('status', function($orders){
return '<span class="chip lighten-4 purple purple-text">'. $orders->status->localized . '</span>';
})
->addColumn('contract', '<i class="material-icons">file_download</i>')
->addColumn('edit', '<i class="material-icons">edit</i>')
->rawColumns(['products', 'status', 'edit', 'contract'])
->make(true);
}

Answer 1

The issue is with scope method
public function scopesearchFullName($query, $value){
return $query->where('first_name', 'LIKE', "%".$value."%")
->orWhere('middle_name', 'LIKE', "%".$value."%")
->orWhere('last_name', 'LIKE', "%".$value."%");
}
Also make sure that only those user record returns who has orders.
Also for searching sellers order
$orders = $orders->whereHas('seller', function ($q) use ($request){
$q->searchFullName($request->seller);
});
so in Order model
public function seller()
{
return $this->belongsTo(User::class, 'seller_id', 'id');
}