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我有模型,如那些在Django:django一对一的左连接为空?
class User(models.Model):
name = models.CharField(max_length = 128)
class Message(models.Model):
sender = models.ForeignKey(User, related_name = 'messages_sent')
recipient = models.ForeignKey(User, related_name = 'messages_recieved')
subject = models.CharField(max_length = 128)
body = models.CharField(max_length = 3500)
class Response(models.Model):
message = models.OneToOneField(Message, primary_key = True)
reply = models.TextField()
,我试图让一切针对无反应,这是我会在SQL编写的用户消息:
select * from user u
join message m on (u.id = m.recipient_id)
left join response r on (m.id = r.message_id)
where r.message_id = null
我倒是觉得自然的方式来做到这一点是:
u.messages_recieved.filter(response = None)
或
u.messages_recieved.filter(response__message_id__isnull = True)
但始终生成的SQL结束是:
WHERE ("project_message"."recipient_id" = 1 AND "project_message"."id" IS NULL)
我做一些愚蠢的事,或者这是在Django的错误吗?
哈!所以它可能被固定在1.1RC中,因为在1.0.2中以上都不适合我。让我检查一下。 – tpk 2009-07-27 18:49:22