class Affaire(EntityType):

    permissions = {

        'read':   ('managers', 'users', 'guests'),

        'add':    ('managers', ERQLExpression('X concerne S, S owned_by U')),

        'update': ('managers', 'owners', ERQLExpression('X concerne S, S owned_by U')),

        'delete': ('managers', 'owners', ERQLExpression('X concerne S, S owned_by U')),

        }

    ref = String(fulltextindexed=True, indexed=True,

                 constraints=[SizeConstraint(16)])

    sujet = String(fulltextindexed=True,

                 constraints=[SizeConstraint(256)])

class concerne(RelationType):

    permissions = {

        'read':   ('managers', 'users', 'guests'),

        'add':    ('managers', RRQLExpression('U has_update_permission S')),

        'delete': ('managers', RRQLExpression('O owned_by U')),

        }