Added some basic methods to the models to get roperties from related models or

the related models themselfes.

app/Booking.php

@@ -6,5 +6,13 @@ use Illuminate\Database\Eloquent\Model;
 
 class Booking extends Model
 {
-    //
+    public function amount()
+    {
+        return $this->hasMany('App\SubBooking')->amount;
+    }
+
+    public function signedAmount()
+    {
+        return $this->amount;
+    }
 }