Merge pull request #1 from dikopylov/getting-by-level

Getting by level

src/QueryBuilder.php

@@ -427,6 +427,20 @@ public function toLevel(?int $level): self
         return $this;
     }
 
+    /**
+     * @param int|null $level
+     *
+     * @return $this
+     */
+    public function byLevel(?int $level): self
+    {
+        if ($level !== null) {
+            $this->query->where($this->model->levelAttribute()->name(), $level);
+        }
+
+        return $this;
+    }
+
     /**
      * Get wrapped column names.
      *