add:新增Collection toTree方法

extend/catcher/traits/db/BaseOptionsTrait.php

@@ -2,7 +2,9 @@
 
 namespace catcher\traits\db;
 
+use catcher\CatchModelCollection;
 use catcher\Utils;
+use think\Collection;
 
 trait BaseOptionsTrait
 {
@@ -186,4 +188,25 @@ trait BaseOptionsTrait
 
         return $model->save();
     }
+
+    /**
+     * rewrite collection
+     *
+     * @time 2020年10月20日
+     * @param array|iterable $collection
+     * @param string|null $resultSetType
+     * @return CatchModelCollection|mixed
+     */
+    public function toCollection(iterable $collection = [], string $resultSetType = null): Collection
+    {
+        $resultSetType = $resultSetType ?: $this->resultSetType;
+
+        if ($resultSetType && false !== strpos($resultSetType, '\\')) {
+            $collection = new $resultSetType($collection);
+        } else {
+            $collection = new CatchModelCollection($collection);
+        }
+
+        return $collection;
+    }
 }