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"""
Django Extensions abstract base model classes.
"""
import datetime
from django.db import models
from django.utils.translation import ugettext_lazy as _
from django_extensions.db.fields import (ModificationDateTimeField,
CreationDateTimeField, AutoSlugField)
class TimeStampedModel(models.Model):
""" TimeStampedModel
An abstract base class model that provides self-managed "created" and
"modified" fields.
"""
created = CreationDateTimeField(_('created'))
modified = ModificationDateTimeField(_('modified'))
class Meta:
abstract = True
class TitleSlugDescriptionModel(models.Model):
""" TitleSlugDescriptionModel
An abstract base class model that provides title and description fields
and a self-managed "slug" field that populates from the title.
"""
title = models.CharField(_('title'), max_length=255)
slug = AutoSlugField(_('slug'), populate_from='title')
description = models.TextField(_('description'), blank=True, null=True)
class Meta:
abstract = True
class ActivatorModelManager(models.Manager):
""" ActivatorModelManager
Manager to return instances of ActivatorModel: SomeModel.objects.active() / .inactive()
"""
def active(self):
""" Returns active instances of ActivatorModel: SomeModel.objects.active() """
return super(ActivatorModelManager, self).get_query_set().filter(status=1)
def inactive(self):
""" Returns inactive instances of ActivatorModel: SomeModel.objects.inactive() """
return super(ActivatorModelManager, self).get_query_set().filter(status=0)
class ActivatorModel(models.Model):
""" ActivatorModel
An abstract base class model that provides activate and deactivate fields.
"""
STATUS_CHOICES = (
(0, _('Inactive')),
(1, _('Active')),
)
status = models.IntegerField(_('status'), choices=STATUS_CHOICES,
default=1)
activate_date = models.DateTimeField(blank=True, null=True,
help_text=_('keep empty for an immediate activation'))
deactivate_date = models.DateTimeField(blank=True, null=True,
help_text=_('keep empty for indefinite activation'))
objects = ActivatorModelManager()
class Meta:
abstract = True
def save(self, *args, **kwargs):
if not self.activate_date:
self.activate_date = datetime.datetime.now()
super(ActivatorModel, self).save(*args, **kwargs)
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