add:新增Collection toTree方法

extend/catcher/CatchModelCollection.php

@@ -0,0 +1,12 @@
+<?php
+namespace catcher;
+
+use think\model\Collection;
+
+class CatchModelCollection extends Collection
+{
+    public function toTree($pid = 0, $pidField = 'parent_id', $children = 'children')
+    {
+        return Tree::done($this->items, $pid, $pidField, $children);
+    }
+}