django外键关系查找 [英] django foreign key relation lookup

问题描述

给出以下模型：

class Post(models.Model):
    title = models.CharField(max_length=200)
    html = models.TextField()

class PostTag(models.Model):
    post = models.ForeignKey('Post')
    tag = models.CharField(max_length=200)

我想完成查找一个基于给定PostTag。所以如果我有两个帖子，A和B，标记为foo，我想能够查找所有帖子与该标签，并得到A和B的帖子。

I want to accomplish looking up a Post based on a given PostTag. So if I had two posts, A and B, tagged as "foo", I want to be able to look up all posts with that tag and get the posts A and B back.

我的图像查询将如下所示：

I image the query would look something like the following:

posts = Post.objects.filter(tag=tag)

有关开始完成此操作的任何提示？

Any tips on where to start to accomplish this?

推荐答案

关闭。您需要指定您正在跨越哪个字段

Close. You need to specify which field you're spanning across.

Post.objects.filter(posttag__tag=tag)

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