序列化器嵌套（orm关联查询）

建表 models.py

# 角色表
class Roles(BaseModel):
    name = models.CharField(max_length=50,null=False,unique=True)
    pid = models.IntegerField(default=0)    #能被继承 0   不能被继承 1
    types = models.IntegerField(default=1)  # 1普通角色 2被继承的角色

    class Meta:
        db_table = "roles"


# 用户表
class AdminUser(BaseModel):
    name = models.CharField(max_length=50, null=False)
    mobile = models.CharField(max_length=11)
    roleid = models.ForeignKey(Roles, on_delete=models.CASCADE)

    class Meta:
        db_table = "admin_user"

序列化器 sers.py

class RoleSer(serializers.ModelSerializer):

    class Meta:
        model = Roles
        fields = '__all__'

class AdminUserSer(serializers.ModelSerializer):
    roleid=RoleSer()
    class Meta:
        model = AdminUser
        fields = '__all__'

注：角色表要在用户表之上才可以进行嵌套

嵌套后查询 views.py

class Show_AdminUser(APIView):
    # 用户展示
    def get(self,request):
        detail = AdminUser.objects.all()
        detailser = AdminUserSer(detail, many=True)
        return Response(detailser.data)

返回结果：
就可以拿到用户表中没有的角色名称进行渲染了