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When on an entity type of the schema, cardinality is defined with + (at least one), and that the constraint is violated, we would except an exception that says that the cardinality is violated. Instead of this, it says that the relation of one is not filled !

Example

Schema

class Group(EntityType):
    units = SubjectRelation('GroupItem, cardinality='+?')

Automatic test

def test_group_unit_multiple_create(self):
    with self.admin_access.cnx() as cnx:
        self.create_group(cnx, units=(self.item1_eid,))
        cnx.commit()
        self.create_group(cnx, units=(self.item1_eid,))
        cnx.commit()  # the exception comes from here

Result

yams._exceptions.ValidationError: 9070 (units-subject): at least one relation units is required on Group (9070)

Stack trace

../../.virtualenvs/nemo/lib/python3.7/site-packages/cubicweb/server/session.py:157: in check_open
    return func(cnx, *args, **kwargs)
../../.virtualenvs/nemo/lib/python3.7/site-packages/cubicweb/server/session.py:735: in commit
    operation.handle_event("precommit_event")
../../.virtualenvs/nemo/lib/python3.7/site-packages/cubicweb/server/hook.py:807: in handle_event
    getattr(self, event)()

Versions used

• CubicWeb 3.32.7
• RQL 0.37.0
• YAMS 0.45.3