Question

我正在使用django 1.6和django-rest-framework 2.4。我有一个与另一个模型有外键关系的通用模型。通用模型显然可以与任何其他主机模型相关联。我希望能够一次性保存主机模型和通用模型及其所有关联。

例如：

models.py：

from django.db import models
from django.contrib.contenttypes.generic import GenericForeignKey, GenericRelation
from django.contrib.contenttypes.models import ContentType


class GenericItem(models.Model):
    content_type = models.ForeignKey(ContentType)
    object_id = models.PositiveIntegerField()
    content_object = GenericForeignKey('content_type', 'object_id')

    details = models.TextField(blank=True)


class GenericSubItem(models.Model):
    generic_item = models.ForeignKey(GenericItem, null=True, blank=True, related_name="sub_items")

    details = models.TextField(blank=True)


class Host(models.Model):
    details = models.TextField(blank=True)

    generic_items = GenericRelation(GenericItem, content_type_field='content_type', object_id_field='object_id')

serializers.py：

from rest_framework import serializers
from . import models


class GenericSubItemSerializer(serializers.ModelSerializer):
    class Meta:
        model = models.GenericSubItem
        fields = ('id', 'details', )


class GenericItemSerializer(serializers.ModelSerializer):
    sub_items = GenericSubItemSerializer(many=True, required=False, allow_add_remove=True)

    class Meta:
        model = models.GenericItem
        fields = ('id', 'details', 'sub_items', )


class HostSerializer(serializers.ModelSerializer):
    generic_items = GenericItemSerializer(many=True, required=False, allow_add_remove=True)

    class Meta:
        model = models.Host
        fields = ('id', 'details', 'generic_items', )

views.py：

from rest_framework import viewsets
from . import serializers, models


class HostView(viewsets.ModelViewSet):
    queryset = models.Host.objects.all()
    serializer_class = serializers.HostSerializer

这里的问题是即使发布了sub_items，也不会保存它们。更糟糕的是，如果你通过shell添加一个子项，它将显示正常，但是当你保存时，子项将被删除。

如何编写序列化程序以便保存主机可以保存其他所有内容？

谢谢，

保

Answer 1

您能否提供有关views.py的更多详情？或者，您可以尝试覆盖create(self, validated_data)中的GenericItemSerializer，如下所示：

class GenericItemSerializer(serializers.ModelSerializer):
    sub_items = GenericSubItemSerializer(many=True, required=False, allow_add_remove=True)

    class Meta:
        model = models.GenericItem
        fields = ('id', 'details', 'sub_items', )

    def create(self, validate_data):
        subitemdata = validate_data.pop('sub_items')
        subitemobj = GenericSubItem.objects.create(**subitemdata)
        GenericItem.objects.create(sub_items=subitemobj, **validate_data)

如何编写django-rest-framework序列化程序来保存包含通用模型的嵌套层次结构？

1 个答案: