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from __future__ import unicode_literals
import copy
import datetime
from django.contrib.auth.models import User
from django.db import models
from django.utils.encoding import python_2_unicode_compatible
@python_2_unicode_compatible
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 __str__(self):
return "%s (%s, %s)" % (self.title, self.id, self.base.id)
def save(self, *args, **kwargs):
super(RevisionableModel, self).save(*args, **kwargs)
if not self.base:
self.base = self
kwargs.pop('force_insert', None)
kwargs.pop('force_update', None)
super(RevisionableModel, self).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()
@python_2_unicode_compatible
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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