Avoid copying a SESSION object in asContext, because it is newly created...

Avoid copying a SESSION object in asContext, because it is newly created implicitly when not present, thus it may induce conflict errors. As ERP5 does not use Zope sessions, it is better to skip SESSION.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15477 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Base.py

@@ -2121,7 +2121,12 @@ class Base( CopyContainer,
       context.__dict__.update(self.__dict__)
       # Copy REQUEST properties to self
       if REQUEST is not None:
-        context.__dict__.update(REQUEST)
+        # Avoid copying a SESSION object, because it is newly created
+        # implicitly when not present, thus it may induce conflict errors.
+        # As ERP5 does not use Zope sessions, it is better to skip SESSION.
+        for k in REQUEST.keys():
+          if k != 'SESSION':
+            context[k] = REQUEST[k]
       # Define local properties
       if kw is not None: context.__dict__.update(kw)
       # Make it a temp content