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import copy
import datetime
from django.contrib.auth.models import User
from django.db import models
class RevisionableModel(models.Model):
base = models.ForeignKey("self", models.SET_NULL, null=True)
title = models.CharField(blank=True, max_length=255)
when = models.DateTimeField(default=datetime.datetime.now)
def save(self, *args, force_insert=None, force_update=None, **kwargs):
super().save(
*args, force_insert=force_insert, force_update=force_update, **kwargs
)
if not self.base:
self.base = self
super().save(*args, **kwargs)
def new_revision(self):
new_revision = copy.copy(self)
new_revision.pk = None
return new_revision
class Order(models.Model):
created_by = models.ForeignKey(User, models.CASCADE)
text = models.TextField()
class TestObject(models.Model):
first = models.CharField(max_length=20)
second = models.CharField(max_length=20)
third = models.CharField(max_length=20)
def __str__(self):
return "TestObject: %s,%s,%s" % (self.first, self.second, self.third)
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