我有一个评论/评级的网络应用程序,la Digg。我的Django应用程序content
有以下型号:什么是跨越多个表的查询最好的Django方式?
class Content(models.Model):
title = models.CharField(max_length=128)
url = models.URLField(max_length=2048)
description = models.TextField(blank=True)
class Recommendation(models.Model):
user = models.ForeignKey(User)
content = models.ForeignKey(Content)
review = models.TextField()
rating = models.PositiveSmallIntegerField()
class Meta:
unique_together = ('user', 'content')
class Subscription(models.Model):
subscriber = models.ForeignKey(User, related_name='subscription_set')
publisher = models.ForeignKey(User, related_name='publication_set')
class Meta:
unique_together = ('subscriber', 'publisher')
我想建立一个页面,所有用户的所有建议为之当前用户(request.user
)签约。
如果我写这篇文章的SQL,我相信我会用类似下面的查询结束:
select content_content.*, content_recommendation.*, auth_user.*
from content_content, content_recommendation, content_subscription, auth_user
where content_content.id = content_recommendation.content_id
and content_recommendation.user_id = content_subscription.publisher_id
and content_subscription.subscriber_id = ?
and auth_user.id = content_subscription.publisher_id;
我将如何表达这种使用Django的查询API的?我已经阅读过文档,但是我无法理解它。