From f192ac8ea35c2c8a3666831229cfa310a76d5e39 Mon Sep 17 00:00:00 2001
From: UR-0 <u.r.f.pub.2016@online.de>
Date: Sat, 15 Feb 2020 10:05:48 +0100
Subject: [PATCH] FEM: Migrate older result objects FemResultMechanical due to
 renaming property "StressValues" to "vonMises"

---
 src/Mod/Fem/femobjects/_FemResultMechanical.py | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/Mod/Fem/femobjects/_FemResultMechanical.py b/src/Mod/Fem/femobjects/_FemResultMechanical.py
index 7406224f5a..85b8e759de 100644
--- a/src/Mod/Fem/femobjects/_FemResultMechanical.py
+++ b/src/Mod/Fem/femobjects/_FemResultMechanical.py
@@ -141,7 +141,7 @@ class _FemResultMechanical():
             "App::PropertyFloatList",
             "vonMises",
             "NodeData",
-            "",
+            "List of von Mises equivalent stresses",
             True
         )
         obj.addProperty(
@@ -301,6 +301,20 @@ class _FemResultMechanical():
     def onChanged(self, obj, prop):
         return
 
+    def onDocumentRestored(self, obj):
+        # migrate old result objects, because property "StressValues"
+        # was renamed to "vonMises"
+        if hasattr(obj, "StressValues") == True:
+            obj.addProperty(
+                "App::PropertyFloatList",
+                "vonMises",
+                "NodeData",
+                "List of von Mises equivalent stresses",
+                True
+            )
+            obj.vonMises = obj.StressValues
+            obj.removeProperty("StressValues")
+
     def __getstate__(self):
         return self.Type