where in model laravel code example

Example 1: laravel firstorcreate

// Retrieve flight by name, or create it if it doesn't exist...
$flight = App\Flight::firstOrCreate(['name' => 'Flight 10']);

// Retrieve flight by name, or create it with the name, delayed, and arrival_time attributes...
$flight = App\Flight::firstOrCreate(
    ['name' => 'Flight 10'],
    ['delayed' => 1, 'arrival_time' => '11:30']
);

// Retrieve by name, or instantiate...
$flight = App\Flight::firstOrNew(['name' => 'Flight 10']);

// Retrieve by name, or instantiate with the name, delayed, and arrival_time attributes...
$flight = App\Flight::firstOrNew(
    ['name' => 'Flight 10'],
    ['delayed' => 1, 'arrival_time' => '11:30']
);

Example 2: laravel find query

return Destination::orderByDesc(
    Flight::select('arrived_at')
        ->whereColumn('destination_id', 'destinations.id')
        ->orderBy('arrived_at', 'desc')
        ->limit(1)
)->get();