Django-序列化具有依赖性的模型对象

问题描述 投票:0回答:1

在序列化TestChild模型对象的查询集时,我希望json包含相关的TestParent对象。

这是我的代码:

from django.db import models


class TestParentManager(models.Manager):
    def get_by_natural_key(self, field1, field2):
        return self.get(field1=field1, field2=field2)


class TestParent(models.Model):
    field1 = models.CharField(max_length=20, blank=True, default='')
    field2 = models.CharField(max_length=20, blank=True, default='')
    field3 = models.CharField(max_length=20, blank=True, default='')

    objects = TestParentManager()

    def natural_key(self):
        return (self.field1, self.field2)

    class Meta:
        unique_together = [['field1', 'field2']]


class TestChildManager(models.Manager):
    def get_by_natural_key(self, field1, field2):
        return self.get(field1=field1, field2=field2)


class TestChild(models.Model):
    parent = models.ForeignKey(TestParent, on_delete=models.CASCADE)
    field1 = models.CharField(max_length=20, blank=True, default='')
    field2 = models.CharField(max_length=20, blank=True, default='')
    field3 = models.CharField(max_length=20, blank=True, default='')

    objects = TestChildManager()

    def natural_key(self):
        return (self.field1, self.field2)
    natural_key.dependencies = ['environ_tool.testparent']

    class Meta:
        unique_together = [['field1', 'field2']]

我跑步时

serializers.serialize(
    'json',
    eModels.TestChild.objects.all(),
    use_natural_foreign_keys=True,
    use_natural_primary_keys=True,
)

生成的json就像这样(没有TestParent对象):

[{u'fields': {u'field1': u'f1',
              u'field2': u'f2',
              u'field3': u'f3',
              u'parent': [u'foo2', u'']},
  u'model': u'environ_tool.testchild'}]

但是我也想在json中看到TestChild对象也依赖的TestParent对象,就像这样:

[{u'fields': {u'field1': u'foo2', u'field2': u'', u'field3': u''},
  u'model': u'environ_tool.testparent'},
 {u'fields': {u'field1': u'f1',
              u'field2': u'f2',
              u'field3': u'f3',
              u'parent': [u'foo2', u'']},
  u'model': u'environ_tool.testchild'}]

django文档使我相信这应该发生在序列化中,但是没有运气。我正在使用Django 1.11,这是文档页面https://docs.djangoproject.com/en/1.11/topics/serialization/

谢谢!

python json django serialization foreign-keys
1个回答
0
投票

您可以为孩子编写序列化程序类。

class ChildSerializer(serializers.ModelSerializer):
    class Meta:
        model = childmodel
        fields = '__all__'
        depth = 1

您可以这样称呼它

serializer = ChildSerializer([childinstance1, ], many=True)

然后您可以将其转换为json

© www.soinside.com 2019 - 2024. All rights reserved.