django admin基础

通过onetoonefiled扩展得到的不会在添加user是自动添加原因是onetoonefiled只是一个model

可以they are just Django models that happen to have a one-to-one link with a User model. As such, they do not get auto created when a user is created, but a django.db.models.signals.post_savecould be used to create or update related models as appropriate.

这样来做

django中，如果一个数据库中的表之间有外键的话可以方便的通过一个表查询到其相关表的数据。如有下面三个model：
class Blog(models.Model):
    name = models.CharField(max_length=100)
    tagline = models.TextField()

    def __unicode__(self):
        return self.name

class Author(models.Model):
    name = models.CharField(max_length=50)
    email = models.EmailField()

    def __unicode__(self):
        return self.name

class Entry(models.Model):
    blog = models.ForeignKey(Blog)
    headline = models.CharField(max_length=255)
    body_text = models.TextField()
    pub_date = models.DateTimeField()
    authors = models.ManyToManyField(Author)
    n_comments = models.IntegerField()
    n_pingbacks = models.IntegerField()
    rating = models.IntegerField()

    def __unicode__(self):
        return self.headline


可以使用__来查询相关连的表里的数据，如：
Entry.objects.filter(blog__name__exact=‘Beatles Blog‘)
Blog.objects.filter(entry__headline__contains=‘Lennon‘)

来源： http://www.bubuko.com/infodetail-618303.html

来自为知笔记(Wiz)