如何扩展Django第三方模型？

Question

我使用的是Python 3.7、Django 2.0和Django address==0.2.1模块（https://pypi.org/project/django-address/）。地址模块似乎可以为我的应用程序自动创建迁移和导入模型，这很好。我想创建一个

def get_by_natural_key(self, name):
    return self.get_or_create(...fields...)[0]

AddressField模型的方法（为了简化YAML数据的创建）。是否可以将其添加到AddressField模型中，而不更改作为安装此应用程序的一部分下载的核心文件？为该模型创建的MySQL表是

+
| address_address | CREATE TABLE `address_address` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `street_number` varchar(20) COLLATE utf8_bin NOT NULL,
  `route` varchar(100) COLLATE utf8_bin NOT NULL,
  `raw` varchar(200) COLLATE utf8_bin NOT NULL,
  `formatted` varchar(200) COLLATE utf8_bin NOT NULL,
  `latitude` double DEFAULT NULL,
  `longitude` double DEFAULT NULL,
  `locality_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `address_address_locality_id_5dd79609_fk_address_locality_id` (`locality_id`),
  CONSTRAINT `address_address_locality_id_5dd79609_fk_address_locality_id` FOREIGN KEY (`locality_id`) REFERENCES `address_locality` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin |
+-----------------+-------------------------------------

虽然不确定这个表结构与我的问题有多相关

Answer 1

首先，我认为您希望get_by_natural_key在模型的管理器上运行，而不是在模型本身中运行，这样就可以像Address.objects.get_by_natural_key一样访问它

为了实现这一点，您可以

from django.db import models

class CustomManager(models.Manager):
    def get_by_natural_key(self, name):
        return self.get_or_create(...fields...)[0]

Address.add_to_class('objects', CustomManager())