I'm using django-simple-history:
http://django-simple-history.readthedocs.io/en/latest/
I have a model, which I would like to apply its methods on an historical instance. Example:
from simple_history.models import HistoricalRecords
class Person(models.Model):
firstname = models.CharField(max_length=20)
lastname = models.CharField(max_length=20)
history = HistoricalRecords()
def fullName(self):
return firstname + lastname
person = Person.objects.get(pk=1) # Person instance
for historyPerson in person.history:
historyPerson.fullName() # wont work.
Since the class HistoricalPerson does not inherit the methods of Person. But using Person methods actually make sense, since they share the same fields..
Any solution for this? I'd prefer something simple, not like duplicating every method in my models for the history instances..
amoskaliov :
I found another workaround (maybe it's just the addon had been updated and got this feature). It's based on the documentation: adding-additional-fields-to-historical-models\nHistoricalRecords field accepts bases parameter which sets a class that history objects will inherit. But you can't just set bases=[Person] inside Person class description, because it's not yet initialized.\nSo I ended up with an abstract class, which is inherited by both Person class and HistoricalRecords field. So the example from the question would look like:\nclass AbstractPerson(models.Model):\n class Meta:\n abstract = True\n\n firstname = models.CharField(max_length=20)\n lastname = models.CharField(max_length=20)\n\n def fullName(self):\n return firstname + lastname\n\nclass Person(AbstractPerson):\n history = HistoricalRecords(bases=[AbstractPerson])\n\nAnd now history objects can use fullName method.",
2020-08-14T17:44:20