extra_where = 'NOT catalogue_tag.category = "set" AND catalogue_tag.main_page = 1'
tags = models.Tag.objects.usage_for_model(models.Book, counts=True, extra={'where': [extra_where]})
fragment_tags = models.Tag.objects.usage_for_model(models.Fragment, counts=True,
extra_where = 'NOT catalogue_tag.category = "set" AND catalogue_tag.main_page = 1'
tags = models.Tag.objects.usage_for_model(models.Book, counts=True, extra={'where': [extra_where]})
fragment_tags = models.Tag.objects.usage_for_model(models.Fragment, counts=True,