Add prices and filtering by sale_channel with default

app/Models/Shop/SaleChannel.php

@@ -23,4 +23,9 @@ class SaleChannel extends Model
     {
         return $this->hasManyThrough(Tariff::class, PriceList::class, 'sale_channel_id', 'id', 'id', 'tariff_id');
     }
+
+    public function scopeByCode($query, $code)
+    {
+        return $query->where($this->table . '.code', $code);
+    }
 }