From 72499b6fbb161e7d46d82f09439cef1f8faee3b2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sybren=20A=2E=20St=C3=BCvel?= <sybren@stuvel.eu>
Date: Tue, 31 May 2016 17:57:40 +0200
Subject: [PATCH] Added Resource.new(dict_or_resource) class method.

This allows one to up-cast a Resource to a File, Project, Node, etc.
---
 pillarsdk/resource.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/pillarsdk/resource.py b/pillarsdk/resource.py
index c25f3d9..350a0d1 100644
--- a/pillarsdk/resource.py
+++ b/pillarsdk/resource.py
@@ -129,6 +129,18 @@ class Resource(object):
             self[key] = val
         return self
 
+    @classmethod
+    def new(cls, dict_or_resource):
+        """None-safe constructor."""
+
+        if dict_or_resource is None:
+            return None
+
+        if isinstance(dict_or_resource, Resource):
+            dict_or_resource = dict_or_resource.to_dict()
+
+        return cls(dict_or_resource)
+
 
 class Find(Resource):