Question

考虑类模型如下：

alt text http://www.forteresse.net/site/stackoverflow/classes.png/image

你在models.py中怎么做？

class House(models.Model):
    foo = models.CharField(max_length=123)

class Caravan(models.Model):
    foo = models.CharField(max_length=123)

class Door(models.Model):
    bar = models.CharField(max_length=123)
    house = models.ForeignKey(House)
    caravan = models.ForeignKey(Caravan)

但是这些外键定义可能不是预期的。你如何在django中编码？目的是为“House”和“Caravan”重复使用相同型号的“Door”。

深入挖掘后，我发现了这一点;这是建模问题的正确方法吗？

class House(models.Model):
    foo = models.CharField(max_length=123)

class Caravan(models.Model):
    foo = models.CharField(max_length=123)

class Door(models.Model):
    bar = models.CharField(max_length=123)
    house = models.ForeignKey(House, null=True, blank=True)
    caravan = models.ForeignKey(Caravan, null=True, blank=True)

Answer 1

class Door(models.Model):
    bar = models.CharField(max_length=123)

class Caravan(models.Model):
    foo = models.CharField(max_length=123)
    doors = models.ManyToManyField(Door)

class House(models.Model):
    foo = models.CharField(max_length=123)
    doors = models.ManyToManyField(Door)

Answer 2

我认为你应该尝试：

class Door(models.Model):
    bar = models.CharField(max_length=123)

class House(models.Model):
    foo = models.CharField(max_length=123)
    door = models.ForeignKey(Door)

class Caravan(models.Model):
    foo = models.CharField(max_length=123)
    door = models.ForeignKey(Door)

Answer 3

您能通过示例查询澄清您真正想要的内容吗？我不清楚。这就是我认为你在寻找的东西：

class Door(models.Model):
  bar = models.CharField(max_length=123)

class House(Door):
  foo = models.CharField(max_length=123)

class Caravan(Door):
  foo = models.CharField(max_length=123)

然后你可以做Caravan.objects.values('foo','bar')

之类的事情

你怎么在django模拟这个？

3 个答案: