'Register a model or a list of models for comment moderation,
using a particular moderation class.
Raise ``AlreadyModerated`` if any of the models are already
registered.'

def register(self, model_or_iterable, moderation_class):

    if isinstance(model_or_iterable, ModelBase):
        model_or_iterable = [model_or_iterable]
    for model in model_or_iterable:
        if (model in self._registry):
            raise AlreadyModerated(("The    model    '%s'    is    already    being    moderated" % model._meta.module_name))
        self._registry[model] = moderation_class(model)
