class UserInfo(models.Model):

    nickname = models.CharField(max_length=32)

    username = models.CharField(max_length=32)

    password = models.CharField(max_length=64)

    gender_choices = (

        (1,‘男‘),

        (2,‘女‘),

    )

    gender = models.IntegerField(choices=gender_choices)

ralated_query_name　

class U2U(models.Model):

    g = models.ForeignKey(‘UserInfo‘,ralated_query_name=‘a‘)

    b = models.ForeignKey(‘UserInfo‘,ralated_query_name=‘b‘)

   # ralated_query_name

  #  obj.对象男.b_set.all()

  #  obj.对象女.a_set.all()

ralated_name

class U2U(models.Model):

    g = models.ForeignKey(‘UserInfo‘,ralated_name=‘a‘)

    b = models.ForeignKey(‘UserInfo‘,ralated_name=‘b‘)

    # ralated_name

    #  obj.对象男.b.all()

    #  obj.对象女.a.all()

class UserType(models.Model):

    title = models.CharField(max_length=32)

class User(models.Model):

    username = models.CharField(max_length=32)

    ut = models.ForeignKey(‘UserType‘,related_name=‘xxx‘)

## related_name=‘xxx‘：

反向：小写表名user_set ===>xxx

## related_query_name = ‘xxx‘

反向：user_set==>xxx_set

ut = models.ForeignKey(‘UserType‘,related_name=‘users‘)