python – Django继承模型的JSON序列化

我有以下Django模型

class ConfigurationItem(models.Model):

    path = models.CharField('Path', max_length=1024)
    name = models.CharField('Name', max_length=1024, blank=True)
    description = models.CharField('Description', max_length=1024, blank=True)
    active = models.BooleanField('Active', default=True)
    is_leaf = models.BooleanField('Is a Leaf item', default=True)

class Location(ConfigurationItem):

    address = models.CharField(max_length=1024, blank=True)
    phoneNumber = models.CharField(max_length=255, blank=True)
    url = models.URLField(blank=True)
    read_acl = models.ManyToManyField(Group, default=None)
    write_acl = models.ManyToManyField(Group, default=None)
    alert_group= models.EmailField(blank=True)

如果有帮助,完整的模型文件是here.

您可以看到Company是ConfigurationItem的子类.

我正在尝试使用django.core.serializers.serializer或WadofStuff序列化程序来使用JSON序列化.

两个序列化器给我同样的问题……

>>> from cmdb.models import *
>>> from django.core import serializers
>>> serializers.serialize('json', [ ConfigurationItem.objects.get(id=7)])
    '[{"pk": 7, "model": "cmdb.configurationitem", "fields": {"is_leaf": true,    "extension_attribute_10": "", "name": "", "date_modified": "2010-05-19 14:42:53", "extension_attribute_11": false, "extension_attribute_5": "", "extension_attribute_2": "", "extension_attribute_3": "", "extension_attribute_1": "", "extension_attribute_6": "", "extension_attribute_7": "", "extension_attribute_4": "", "date_created": "2010-05-19 14:42:53", "active": true, "path": "/Locations/London", "extension_attribute_8": "", "extension_attribute_9": "", "description": ""}}]'
>>> serializers.serialize('json', [ Location.objects.get(id=7)])
    '[{"pk": 7, "model": "cmdb.location", "fields": {"write_acl": [], "url": "", "phoneNumber": "", "address": "", "read_acl": [], "alert_group": ""}}]'
>>>

问题是序列化公司模型只能给我直接与该模型相关联的字段,而不是它的父对象中的字段.

有没有办法改变这种行为,还是应该考虑构建一个对象字典并使用simplejson格式化输出？

提前致谢

〜SM

解决方法:

这是对原始海报来说可能来得太晚的时代之一,但对于下一个Google员工可能会派上用场.

如果您需要更高级的序列化,我无法帮助您,但如果您只想要优雅地处理多表继承,那么要查看的位置是：Serializer基类的django / core / serializers / base.py.

在序列化方法中有一行：

for field in concrete_model._meta.local_fields:

Monkeypatching或overriding该类&用以下内容替换该行：

for field in concrete_model._meta.fields:

但是有一些需要注意的注意事项,请参阅Django Git repo& amp;中的提交12716794db.这两个问题：

https://code.djangoproject.com/ticket/7350

https://code.djangoproject.com/ticket/7202

长话短说,你可能应该小心在全球范围内这样做,尽管根据你的目标压倒这种行为可能会很好.

标签：json,python,django,jsonserializer
来源： https://codeday.me/bug/20190606/1190789.html