from django.db import models

from django.dispatch import dispatcher

from django.contrib.contenttypes.models import ContentType

from django.utils.encoding import force_unicode

class CommentManager(models.Manager):

    def in_moderation(self):

        """

        QuerySet for all comments currently in the moderation queue.

        """

        return self.get_query_set().filter(is_public=False, is_removed=False)

    def for_model(self, model):

        """

        QuerySet for all comments for a particular model (either an instance or

        a class).

        """

        ct = ContentType.objects.get_for_model(model)

        qs = self.get_query_set().filter(content_type=ct)

        if isinstance(model, models.Model):

            qs = qs.filter(object_pk=force_unicode(model._get_pk_val()))

        return qs