Synchro back-office, fix on tariffs

app/Models/Shop/Category.php

@@ -35,4 +35,9 @@ class Category extends Model
         return $this->belongsTo(app('rinvex.categories.category'),'category_id');
     }
 
+    public function scopeByCategory($query, $category_id)
+    {
+        return $query->where('category_id', $category_id);
+    }
+
 }