Django OneToOneField 到多个模型和多个 OneToOneField

Question

我有以下型号：

class District(models.Model):
   pk_district = models.AutoField(primary=True)

class Block(models.Model):
   pk_block = models.AutoField(primary=True)

class Community(models.Model):
   pk_community = models.AutoField(primary=True)

class RelateOne(models.Model):
   pk_object = models.OneToOneField('District or Block or Community')
   name = models.CharField()

class RelateTwo(models.Model):
   pk_object = models.OneToOneField('District or Block or Community')
   name = models.CharField()

我希望RelateOne 或RelateTwo 模型关联District 或Block 或Community，然后我可以这样使用它：

district = District.objects.get(pk=1)
district.relate_one.name
district.relate_two.name

block = Block.objects.get(pk=1)
block.relate_one.name
block.relate_two.name

Block.objects.select_related('relate_one','relate_two')

我应该如何正确设置模型？

Answer 1

您可以使用 django 文档中的 GenericForeignKey：https://docs.djangoproject.com/en/3.2/ref/contrib/contenttypes/

我会在 Block 或 District 中指定键，以确保每个通用关系只有“一个”块

确保指定相关属性以获取反向关系，尽管在您的情况下您不需要。

所以它看起来像这样：

class Community(models.Model):
   pk_community = models.AutoField(primary=True)
   content_type = models.ForeignKey(ContentType, 
                                    on_delete=models.CASCADE)
   object_id = models.CharField(max_length=100)
   content_object = GenericForeignKey("content_type", "object_id")

class RelateOne(models.Model):
   name = models.CharField(primary_key=)

class RelateTwo(models.Model):
   name = models.CharField(primary_key=True)

# to use it would be something like this:
rel1= RelationOne(name="john")
rel2= RelationTwo(name="dave")
com_data={content_object=rel1,**your_other_data}
com=Community(**com_data)
com.save

#then to access relation:
com.content_object.rel_one_or_two_field....
# remember to be careful as these are generic, it's best to let a 
#serializer take care of this.