def contribute_to_class(self, cls, name, virtual_only=False):
super(VersionField, self).contribute_to_class(cls, name)
if hasattr(cls, '_concurrencymeta') or cls._meta.abstract:
return
setattr(cls, '_concurrencymeta', ConcurrencyOptions())
cls._concurrencymeta.field = self
cls._concurrencymeta.base = cls
def contribute_to_class(self, cls, *args, **kwargs):
super(VersionField, self).contribute_to_class(cls, *args, **kwargs)
if hasattr(cls, '_concurrencymeta') or cls._meta.abstract:
return
setattr(cls, '_concurrencymeta', ConcurrencyOptions())
cls._concurrencymeta.field = self
cls._concurrencymeta.base = cls
cls._concurrencymeta.triggers = []