From 2c1ae2772c6063745d7605259fb39878b634e318 Mon Sep 17 00:00:00 2001
From: Benjamin Dauvergne <bdauvergne@entrouvert.com>
Date: Fri, 2 Oct 2015 15:52:09 +0200
Subject: [PATCH 1/2] formdef: allow field classes to have migrate methods
 (#8402)

Allow modifying the storage of fields.
---
 wcs/fields.py  | 3 +++
 wcs/formdef.py | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/wcs/fields.py b/wcs/fields.py
index fbde7d3..de83f3f 100644
--- a/wcs/fields.py
+++ b/wcs/fields.py
@@ -277,6 +277,9 @@ class Field(object):
     def feed_session(self, value, display_value):
         pass
 
+    def migrate(self):
+        return False
+
 
 class WidgetField(Field):
     hint = None
diff --git a/wcs/formdef.py b/wcs/formdef.py
index 803a6f3..573c744 100644
--- a/wcs/formdef.py
+++ b/wcs/formdef.py
@@ -189,6 +189,9 @@ class FormDef(StorableObject):
                     changed = True
                     break
 
+        for f in self.fields or []:
+            changed |= f.migrate()
+
         if changed:
             self.store()
 
-- 
2.1.4