AttributeEqualityConstraint for ZODB Property Sheet should have always

inherited from PropertyExistenceConstraint


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@41835 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Core/AttributeEqualityConstraint.py

@@ -29,11 +29,14 @@
 #
 ##############################################################################
 
+from Products.ERP5Type.Core.PropertyExistenceConstraint import \
+     PropertyExistenceConstraint
+
 from Products.ERP5Type.mixin.constraint import ConstraintMixin
 from AccessControl import ClassSecurityInfo
 from Products.ERP5Type import Permissions, PropertySheet
 
-class AttributeEqualityConstraint(ConstraintMixin):
+class AttributeEqualityConstraint(PropertyExistenceConstraint):
   """
   This constraint checks the values of a given attribute name on this
   object.
@@ -68,11 +71,10 @@ class AttributeEqualityConstraint(ConstraintMixin):
     """
     attribute_name = self.getConstraintAttributeName()
 
-    # If property does not exist, error will be raised by
-    # PropertyExistence Constraint, but the value has to be set at
-    # least once as there is no need to perform any check if it is the
-    # default value
-    if obj.hasProperty(attribute_name):
+    error = self._checkPropertyConsistency(obj, attribute_name)
+    if error:
+      return [error]
+
     identical = True
 
     # The expected value of the attribute is a TALES Expression