Use copy.deepcopy instead of asContext. Persistent object connected to zodb...

Use copy.deepcopy instead of asContext. Persistent object connected to zodb must not be stored in on-memory classes.

product/ERP5Type/mixin/constraint.py

@@ -196,4 +196,9 @@ class ConstraintMixin(IdAsReferenceMixin('_constraint'), Predicate):
   security.declareProtected(Permissions.AccessContentsInformation,
                             'applyOnAccessorHolder')
   def applyOnAccessorHolder(self, accessor_holder, expression_context, portal):
-    accessor_holder.constraints.append(self.asContext().aq_base)
+    # Do not use asContext. Temporary object generated by asContext may
+    # contain persistent object. If persistent object is stored on memory like
+    # this(accessor_holder is on-memory object and is kept beyond transaction)
+    # then ConnectionStateError occurs after a long time.
+    import copy
+    accessor_holder.constraints.append(copy.deepcopy(self.aq_base))