未提供项目描述
项目描述
一组有用的自定义字段，可用于使用Django模型实现策略模式。
策略以标准选择字段的形式显示在SelectBoxes中
此软件包提供以下自定义字段
StrategyField
MultipleStrategyField
StrategyClassField
MultipleStrategyClassField
StrategyField可以像模型实例一样访问，它有一个指向“拥有”字段的模型（反向关系）的属性context。因此
示例
from strategy_field.fields import StrategyField
from django.core.mail.backends.filebased.EmailBackend
class Event(models.Model):
backend = StrategyField()
Event(sender='django.core.mail.backends.filebased.EmailBackend')用例
例如，我们可以想象一个管理需要通知用户的事件的应用程序。每个事件的每次发生都可以使用不同的传输方式（电子邮件、短信等）进行通知。我们希望能够通过Django管理面板简单地按事件添加/更改发送通知的方式。
from strategy_field.fields import StrategyField
from strategy_field.registry import Registry
class TransportRegistry(Registry)
pass
class AbstractStrategy(object):
def __init__(self, context):
self.context = context
def send(self):
raise NotImplementedError
class EmailStrategy(AbstractTransport):
def send(self):
...
class SMSStrategy(AbstractTransport):
def send(self):
...
registry = TransportRegistry(AbstractStrategy)
registry.register(EmailStrategy)
registry.register(SMSStrategy)
class Event(models.Model):
sender = StrategyField(registry=registry)
Event.objects.get_or_create(sender=EmailStrategy)
...
...
e = Event.objects.get(sender=EmailStrategy)
e.sender.send() # e.sender.context == e更多示例
使用可调用函数
from strategy_field.fields import StrategyField
from strategy_field.registry import Registry
registry1 = Registry()
registry2 = Registry()
class A(model):
sender = StrategyField(registry=lambda model: model._registry)
class Meta:
abstract = True
class C1(A):
_registry = registry1
class Meta:
abstract = True
class C2(A):
_registry = registry2
class Meta:
abstract = True项目链接
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django-strategy-field-3.1.0.tar.gz 的哈希值
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