Question

我知道没有OneToManyField。但在这种情况下我需要一个。

我想将许多Image对象保存到一个Advertisement对象中。我怎样才能做到这一点？

我有以下情况：

models.py

class Image(models.Model):
   id = models.AutoField(primary_key=True)
   image = models.ImageField(upload_to="", default="", null=True)

   def __str__(self):
       return self.image.url

class Advertisement(models.Model):
    id = models.AutoField(primary_key=True)
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='user', null=True)
    category = models.ForeignKey(Category, related_name='category', null=True)
    title = models.CharField(max_length=100, null=True)
    description = models.CharField(max_length=5000, null=True)
    date = models.DateTimeField(auto_now_add=True, null=True)

    def __str__(self):
        return self.description

Answer 1

您可以使用ManyToOne依赖项。有关详细信息，请查看官方docs。

class Advertisement(models.Model):
    id = models.AutoField(primary_key=True)
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='user', null=True)
    category = models.ForeignKey(Category, related_name='category', null=True)
    title = models.CharField(max_length=100, null=True)
    description = models.CharField(max_length=5000, null=True)
    date = models.DateTimeField(auto_now_add=True, null=True)

    def __str__(self):
        return self.description

class Image(models.Model):
   id = models.AutoField(primary_key=True)
   image = models.ImageField(upload_to="", default="", null=True)
   advertisment = models.ForeignKey(Advertisement, related_name='advertisment', null=False)

   def __str__(self):
       return self.image.url

如何做一个＆＃34; OneToMany（Field）＆＃34; Django的关系？

1 个答案: