Django ORM - 从中​​间表添加数据

Question

我的 django rest 应用程序中有以下多对多数据结构：

class User(Model):

    name = models.CharField(max_length=64)
    memberships = models.ManyToManyField('Membership', through='UserMembership', related_name='users')

    def __str__(self):
        return "{}".format(self.name)

class Membership(Model):

    name = models.CharField(max_length=64)

    def __str__(self):
        return "{}".format(self.name)

class UserMembership(Model):

    user = models.ForeignKey('User', on_delete=models.CASCADE)
    membership = models.ForeignKey('Membership', on_delete=models.CASCADE)
    reason = models.CharField(max_length=64)

当我想列出我得到的所有用户时：

{
    id: 1,
    name: "name-a",
    memberships: [
        {
            id: 1,
            name: "member-a"
        }, ...
    ]
}

但我实际上想包括“原因”字段

{
    id: 1,
    name: "name-a",
    memberships: [
        {
            id: 1,
            name: "member-a",
            reason: "somereason"
        }, ...
    ]
}

但是如何修改查询集呢？

User.objects.all().values('members__usermember')

不幸的是没有工作......

有人支持吗？

编辑：

序列化器：

class UserSerializer(serializers.ModelSerializer):

    class Meta:
        model = User
        fields = ('id', 'name', 'memberships')

class MembershipSerializer(serializers.ModelSerializer):

    class Meta:
        model = Membership
        fields = ('id', 'name')

Answer 1

我认为您的问题的解决方案更多地取决于您如何使用查询集本身序列化对象。

您是否使用 django-rest-framework，如果是，请将序列化程序添加到响应中。否则，请注释并添加代码以查看您如何序列化模型。

编辑以添加可能的序列化程序：

尝试使用类似于此剪断的东西

class UserMembershipSerializer(serializer.ModelSerializer):
    name = serializers.ReadOnlyField(source='membership.name')

    class Meta:
        model = UserMembership
        fields = ('reason', 'name')


class UserSerializer(serializer.ModelSerializer):
    memberships = UserMembershipSerializer(source='usermembership_set', many=True)

    class Meta:
        model = User
        fields = ('id', 'name', 'memberships')