相关疑难解决方法(0)

什么是related_name对on ManyToManyField和ForeignKey字段有用的参数？例如,给出以下代码,有什么影响related_name='maps'？

class Map(db.Model):
    members = models.ManyToManyField(User, related_name='maps',
                                     verbose_name=_('members'))

我有一个关于处理m2m /通过模型及其在django rest框架中的表示的问题.我们来看一个经典的例子:

models.py:

from django.db import models

class Member(models.Model):
    name = models.CharField(max_length = 20)
    groups = models.ManyToManyField('Group', through = 'Membership')

class Group(models.Model):
    name = models.CharField(max_length = 20)

class Membership(models.Model):
    member = models.ForeignKey('Member')
    group = models.ForeignKey('Group')
    join_date = models.DateTimeField()

serializers.py:

imports...

class MemberSerializer(ModelSerializer):
    class Meta:
        model = Member

class GroupSerializer(ModelSerializer):
    class Meta:
        model = Group

views.py:

imports...

class MemberViewSet(ModelViewSet):
    queryset = Member.objects.all()
    serializer_class = MemberSerializer

class GroupViewSet(ModelViewSet):
    queryset = Group.objects.all()
    serializer_class = GroupSerializer

在获取成员实例时,我成功接收了所有成员的字段及其组 - 但是我只获得了组的详细信息,而没有来自成员模型的额外详细信息.

换句话说,我希望收到:

{ …

我目前在使用 Django rest 框架执行两层嵌套时遇到问题。我已经阅读了带有嵌套关系的 DRF 文档http://www.django-rest-framework.org/api-guide/relations/并成功完成了第一层，即在 JSON 中显示具有多种颜色的样式。虽然不确定如何链接另一层。任何帮助，将不胜感激。提前致谢！

当前输出如下所示：

[{
    "name": "AAA123",
    "colors": [
        {
            "name": "White"
        }
    ]
},
{
    "name": "BBB222",
    "colors": [
        {
            "name": "White"
        },
        {
            "name": "Pink"
        },
        {
            "name": "Blue"
        }
    ]
}]

想要的输出应该是这样的：

[{
    "name": "AAA123",
    "colors": [
        {
            "name": "White",
            "sizes": [{name: "S"}, {name: "M"}]
        }
    ]
},
{
    "name": "BBB222",
    "colors": [
        {
            "name": "White",
            "sizes": [{name: "XS"}, {name: "S"}]
        },
        {
            "name": "Pink"
            "sizes": [{name: "XL"}, {name: "XXL"}] …