Declare base Constraint class as a mixin rather than a document

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39363 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Core/CategoryExistenceConstraint.py

@@ -28,11 +28,11 @@
 #
 ##############################################################################
 
-from Products.ERP5Type.Core.Constraint import Constraint
+from Products.ERP5Type.mixin.constraint import ConstraintMixin
 from AccessControl import ClassSecurityInfo
 from Products.ERP5Type import Permissions
 
-class CategoryExistenceConstraint(Constraint):
+class CategoryExistenceConstraint(ConstraintMixin):
   """
   This constraint checks whether a category has been defined on this
   object (without acquisition). This is only relevant for ZODB

product/ERP5Type/Core/PropertyExistenceConstraint.py

@@ -28,11 +28,11 @@
 #
 ##############################################################################
 
-from Products.ERP5Type.Core.Constraint import Constraint
+from Products.ERP5Type.mixin.constraint import ConstraintMixin
 from AccessControl import ClassSecurityInfo
 from Products.ERP5Type import Permissions
 
-class PropertyExistenceConstraint(Constraint):
+class PropertyExistenceConstraint(ConstraintMixin):
   """
   This constraint checks whether a property has been defined on this
   object. This is only relevant for ZODB Property Sheets (filesystem

product/ERP5Type/Core/Constraint.py → product/ERP5Type/mixin/constraint.py

@@ -37,15 +37,12 @@ from AccessControl import ClassSecurityInfo
 from Products.ERP5Type import Permissions
 from Products.ERP5Type.Utils import UpperCase
 
-class Constraint(Predicate):
+class ConstraintMixin(Predicate):
   """
-  Constraint implementation (only relevant for ZODB Property sheets,
-  use Products.ERP5Type.Constraint instead for filesystem Property
-  Sheets) relying on Predicate
+  Mixin Constraint implementation (only relevant for ZODB Property
+  sheets, use Products.ERP5Type.Constraint instead for filesystem
+  Property Sheets) relying on Predicate
   """
-  meta_type = 'ERP5 Constraint'
-  portal_type = 'Constraint'
-
   # Declarative security
   security = ClassSecurityInfo()
   security.declareObjectProtected(Permissions.AccessContentsInformation)