fix spent_for permissions, use class notation to define the relation

migration/0.4.0_Any.py

+sync_schema_props_perms('spent_for')

schema.py

 # template's specific schema
-from yams.buildobjs import SubjectRelation
+from yams.buildobjs import RelationDefinition
+from cubicweb.schema import RRQLExpression
 
@@ -3,5 +4,10 @@
 
-from cubes.expense.schema import Expense
-
-Expense.add_relation(SubjectRelation('Workcase', cardinality='?*'),
-                     name='spent_for')
+class spent_for(RelationDefinition):
+    subject = 'Expense'
+    object = 'Workcase'
+    cardinality = '?*'
+    __permissions__ = {
+        'read' : ('managers', 'users'),
+        'add': ('managers', RRQLExpression('S in_state ST, NOT ST name "accepted"')),
+        'delete': ('managers', RRQLExpression('S in_state ST, NOT ST name "accepted"')),
+        }