扩展组模型的嵌套序列化程序在用户序列化程序中缺少某些字段答案

【问题标题】：The nested serializer of extended group model is missing some fields in the user serializer扩展组模型的嵌套序列化程序在用户序列化程序中缺少某些字段
【发布时间】：2020-11-11 11:04:44
【问题描述】：

我在我的 models.py 中扩展了 Group 模型并创建了相应的序列化程序，它工作正常。但是，当我尝试在用户序列化程序中序列化组字段时，我只获得默认字段。让我展示部分代码：

models.py

class GroupExtended(Group):
    description =  models.TextField(blank=True)
    digitaltwin_permissions = models.ManyToManyField(
        to = DigitaltwinPermission,
        blank = True,
        default = None,
        related_name = "gemelo"
    )
    panel_permissions = models.ManyToManyField(
        to = PanelPermission,
        blank = True,
        default = None,
        related_name = "panel"
    )

    def __str__(self):
        return str(self.name)

    class Meta:
        verbose_name_plural = "4. Grupos"

serializer.py

class GroupExtendedSerializer(serializers.ModelSerializer):
    digitaltwin_permissions = DTPSerializer(read_only=True, many=True)
    panel_permissions = PPSerializer(read_only=True, many=True)
    class Meta:
        model = GroupExtended
        fields = ['id','name','description','digitaltwin_permissions','panel_permissions','permissions']

class UserSerializer(serializers.ModelSerializer):
    groups = GroupExtendedSerializer(read_only=True, many=True)
    class Meta:
        model = User
        fields = '__all__'

我通过用户 API 获得的是以下 JSON：

{
"id":1,
"groups":[
   {"id":2,
    "name":"Admin",
    "permissions":[]}
],
etc
}

相反，我想获得：

{
"id":1,
"groups":[
   {"id":2,
    "name":"Admin",
    "permissions":[],
    "description": "whatever",
    "digitaltwin_permissions":[*serialized fields*],
    "panel_permissions": [*serialized fields*]
}
],
etc
}

我做错了什么？有没有可能？

谢谢！

【问题讨论】：

在你的 models.py 中，你不想要 null=True 而不是 blank=True 吗？
我觉得对我来说没关系，也不影响序列化器。

标签： django serialization django-rest-framework

【解决方案1】：

我错过了覆盖 User 类中的 groups 字段。然后，我不得不更改用户序列化程序，因为我想用 ids (group_ids) 编写组。最后，代码是：

models.py

class GroupExtended(Group):
    description =  models.TextField(blank=True)
    digitaltwin_permissions = models.ManyToManyField(
        to = DigitaltwinPermission,
        blank = True,
        default = None,
        related_name = "gemelo"
    )
    panel_permissions = models.ManyToManyField(
        to = PanelPermission,
        blank = True,
        default = None,
        related_name = "panel"
    )

class User(AbstractUser):
    avatar = models.ForeignKey(
        Avatar, 
        on_delete = models.CASCADE,
        blank = True,
        null = True
    )

    groups = models.ManyToManyField(
        to = GroupExtended,
        blank = True
    )

和

serializers.py

class GroupExtendedSerializer(serializers.ModelSerializer):
    digitaltwin_permissions = DTPSerializer(read_only=True, many=True)
    digitaltwin_permissions_ids = serializers.PrimaryKeyRelatedField(
        many=True,  
        read_only=False, 
        queryset = DigitaltwinPermission.objects.all(),
        source = 'digitaltwin_permissions'
    )
    panel_permissions = PPSerializer(read_only=True, many=True)
    panel_permissions_ids = serializers.PrimaryKeyRelatedField(
        many=True,  
        read_only=False, 
        queryset = PanelPermission.objects.all(),
        source = 'panel_permissions'
    )
    class Meta:
        model = GroupExtended
        fields = '__all__'
        depth = 8

class UserSerializer(serializers.ModelSerializer):
    avatar = AvatarSerializer(read_only=True)
    avatar_id = serializers.IntegerField()
    groups = GroupExtendedSerializer(read_only=True, many=True)
    groups_ids = serializers.PrimaryKeyRelatedField(
        many=True,  
        read_only=False, 
        queryset = GroupExtended.objects.all(),
        source = 'groups'
    )

    class Meta:
        model = User
        fields = '__all__'

【讨论】：