refactor to get powerful etype_relation_field function which benefit from ui configuration (eg widgets and fields)
class ToTo(EntityType):
permissions = {
'read': ('managers',),
'add': ('managers',),
'update': ('managers',),
'delete': ('managers',),
}
toto = SubjectRelation('TuTu')
class TuTu(EntityType):
permissions = {
'read': ('managers',),
'add': ('managers',),
'update': ('managers',),
'delete': ('managers',),
}
class toto(RelationType):
permissions = {
'read': ('managers', ),
'add': ('managers', ERQLExpression('S bla Y'),),
'delete': ('managers',),
}