是否有人知道采用评论数量排序的评论模型实例的解决方案是什么?
我看一下评论模型类,并使用:
content_type = models.ForeignKey(ContentType,
verbose_name=_('content type'),
related_name="content_type_set_for_%(class)s")
object_pk = models.TextField(_('object ID'))
content_object = generic.GenericForeignKey(ct_field="content_type", fk_field="object_pk")
答案 0 :(得分:1)
以下是可能会帮助您解决问题的摘录:
http://djangosnippets.org/snippets/1101/
from django.contrib.contenttypes.models import ContentType
from django.contrib.comments.models import Comment
from django.db import connection
qn = connection.ops.quote_name
def qf(table, field): # quote table and field
return '%s.%s' % ( qn(table), qn(field) )
def comments_extra_count(queryset):
commented_model = queryset.model
contenttype = ContentType.objects.get_for_model(commented_model)
commented_table = commented_model._meta.db_table
comment_table = Comment._meta.db_table
sql = '''SELECT COUNT(*) FROM %s
WHERE %s=%%s AND %s=%s
''' % (
qn(comment_table),
qf(comment_table, 'content_type_id'),
qf(comment_table, 'object_pk'),
qf(commented_table, 'id')
)
return queryset.extra(
select={'comment_count': sql },
select_params=(contenttype.pk,)
)
您可以实现所有内联,而无需定义这些方法。最终结果是带有额外属性comment_count的带注释的查询集。排序:
qs_sorted_by_comment_count = comments_extra_count(some_qs).order_by('comment_count')