django-strategy-field 3.2.1
pip install django-strategy-field
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custom fields useful to implement the Strategy Pattern with Django models.
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- License: MIT License (MIT License)
- Author: sax
- Requires: Python >=3.8
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Project description
django-strategy-field
Set of custom fields useful to implement the Strategy Pattern with Django models.
The Strategies are displayed in SelectBoxes as standard choice field
This package provides the following custom fields:
- StrategyField
- MultipleStrategyField
- StrategyClassField
- MultipleStrategyClassField
The StrategyField can be accessed as instance of the model with an attribute
context
that points to model that 'owns' the field (inverse relation). So:
Example
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')
Use case
As example we can imagine an application that manages Events
that need to be notified to users.
Each Occurrence
of Event
can be notified using different transport, (email, sms,...).
We want to be able to add/change the way we send notification, per event basis, simply using
the Django admin panel.
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
More examples
Use callable
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
Project details
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- License: MIT License (MIT License)
- Author: sax
- Requires: Python >=3.8
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- Environment
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