从子视图访问祖父母数据答案

【问题标题】：Accessing Grandparent data from Child view从子视图访问祖父母数据
【发布时间】：2019-05-07 09:53:59
【问题描述】：

我的 Django 模型如下：

class Grandparent(model.Models):
    grandparent_name = models.CharField(max_length="100")
    grandparent_age  = models.IntegerField(default=10)

class Parent(model.Models):
    parent  = ForeignKey(Grandparent,default=1)
    parent_name = models.CharField(max_length="100")

class Child(model.Models):
    parent = ForeignKey(Parent,default=1)
    child_name = models.CharField(max_length="100")

我想从子模型访问祖父母信息。我如何使用 Django Rest 框架来做到这一点。我想要的输出是：对于给定的孩子，也将其父母和祖父母的信息作为响应发送。

【问题讨论】：

标签： django python-3.x django-models django-rest-framework django-views

【解决方案1】：

Use serializer in this way...

class GrandparentSerializer(serializers.ModelSerializer):

     class Meta:
        model = Grandparent
        fields = ('__all__')


class ParentSerializer(serializers.ModelSerializer):
     parent = GrandparentSerializer()

     class Meta:
        model = Parent
        fields = ('__all__')

class ChildSerializer(serializers.ModelSerializer):
   parent = ParentSerializer()
     class Meta:
        model = Child
        fields = ('__all__')

Or provide depth =2 in child serializer to access all Foreign key details .

参考链接：https://www.django-rest-framework.org/api-guide/serializers/#specifying-nested-serialization

class ChildSerializer(serializers.ModelSerializer):
     class Meta:
        model = Child
        fields = ('__all__')
        depth = 2

【讨论】：