127 - Calculating Tickets Sold

app/Concert.php

@@ -99,4 +99,9 @@ class Concert extends Model
     {
         return $this->tickets()->available()->count();
     }
+
+    public function ticketsSold()
+    {
+        return $this->tickets()->sold()->count();
+    }
 }

app/Ticket.php

@@ -15,6 +15,11 @@ class Ticket extends Model
         return $query->whereNull('order_id')->whereNull('reserved_at');
     }
 
+    public function scopeSold($query)
+    {
+        return $query->whereNotNull('order_id');
+    }
+
     public function reserve()
     {
         $this->update(['reserved_at' => Carbon::now()]);