Predicate: support NULL membership criteria.

product/ERP5/tests/testPredicate.py

@@ -66,6 +66,12 @@ class TestPredicateMixIn(ERP5TypeTestCase):
     self.createCategories()
     self.login()
 
+  def beforeTearDown(self):
+    self.portal.organisation_module.manage_delObjects(
+      ids=list(self.portal.organisation_module.objectIds())
+    )
+    self.tic()
+
   def playSequence(self, sequence_string, quiet=QUIET) :
     # don't commit between steps
     sequence = Sequence()
@@ -324,6 +330,22 @@ class TestPredicates(TestPredicateMixIn):
                 ['region/europe/western_europe/germany'])
     self.assertFalse(pred.test(doc))
 
+  def test_BasicCategoryNullMembership(self):
+    # if the document is any member of the base category, the predicate returns
+    # false
+    doc1 = self.createDocument()
+    doc2 = self.createDocument(region='europe/western_europe/france',)
+    self.tic()
+    pred = self.createPredicate(
+      membership_criterion_base_category_list=['region'],
+      membership_criterion_category_list=['region/NULL'])
+    self.assertTrue(pred.test(doc1))
+    self.assertFalse(pred.test(doc2))
+    self.assertItemsEqual(
+      [doc1],
+      [x.getObject() for x in pred.searchResults(portal_type='Organisation')]
+    )
+
   def test_NonExistantCategoryMembership(self):
     # the predicate also return false for non existant category and no error is
     # raised.

product/ERP5Catalog/CatalogTool.py

@@ -1172,7 +1172,7 @@ class CatalogTool (UniqueObject, ZCatalog, CMFCoreCatalogTool, ActiveObject):
       for base_category_id, document_set in base_category_dict.iteritems():
         column = prefix + base_category_id + suffix
         category_query = SimpleQuery(**{
-          column: {document.getUid() for document in document_set},
+          column: {None if document is None else document.getUid() for document in document_set},
         })
         extra_query = onJoin(column)
         if extra_query is not None:

product/ERP5Type/Core/Predicate.py

@@ -161,14 +161,17 @@ class Predicate(XMLObject):
         isMemberOf = context._getCategoryTool().isMemberOf
       with readOnlyTransactionCache():
         for c in membership_criterion_category_list:
-          bc = c.split('/', 1)[0]
+          bc, c_path = c.split('/', 1)
+          is_null = c_path == 'NULL'
           if tested_base_category_list is None or bc in tested_base_category_list:
             if bc in multimembership_criterion_base_category_list:
-              if not isMemberOf(context, c, strict_membership=strict_membership):
+              if (is_null and isMemberOf(context, bc, strict_membership=False)) or \
+                  not isMemberOf(context, c, strict_membership=strict_membership):
                 return 0
             elif bc in membership_criterion_base_category_list and \
                  not tested_base_category.get(bc):
               tested_base_category[bc] = \
+                (is_null and not isMemberOf(context, bc, strict_membership=False)) or \
                 isMemberOf(context, c, strict_membership=strict_membership)
       if 0 in tested_base_category.itervalues():
         return 0
@@ -250,7 +253,7 @@ class Predicate(XMLObject):
         getCategoryParameterDict(
           filterCategoryList(getBaseCategorySet(), getCategoryList()),
           strict_membership=strict_membership,
-          onMissing=lambda category: False,
+          onMissing=lambda category: category.split('/', 1)[1] == 'NULL',
         ),
       )