78 lines
2.8 KiB
Python
78 lines
2.8 KiB
Python
"""
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Django Extensions abstract base model classes.
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"""
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from django.db import models
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from django.utils.translation import ugettext_lazy as _
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from django_extensions.db.fields import (ModificationDateTimeField,
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CreationDateTimeField, AutoSlugField)
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try:
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from django.utils.timezone import now as datetime_now
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assert datetime_now
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except ImportError:
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import datetime
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datetime_now = datetime.datetime.now
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class TimeStampedModel(models.Model):
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""" TimeStampedModel
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An abstract base class model that provides self-managed "created" and
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"modified" fields.
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"""
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created = CreationDateTimeField(_('created'))
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modified = ModificationDateTimeField(_('modified'))
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class Meta:
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get_latest_by = 'modified'
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ordering = ('-modified', '-created',)
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abstract = True
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class TitleSlugDescriptionModel(models.Model):
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""" TitleSlugDescriptionModel
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An abstract base class model that provides title and description fields
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and a self-managed "slug" field that populates from the title.
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"""
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title = models.CharField(_('title'), max_length=255)
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slug = AutoSlugField(_('slug'), populate_from='title')
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description = models.TextField(_('description'), blank=True, null=True)
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class Meta:
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abstract = True
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class ActivatorModelManager(models.Manager):
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""" ActivatorModelManager
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Manager to return instances of ActivatorModel: SomeModel.objects.active() / .inactive()
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"""
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def active(self):
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""" Returns active instances of ActivatorModel: SomeModel.objects.active() """
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return self.get_query_set().filter(status=ActivatorModel.ACTIVE_STATUS)
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def inactive(self):
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""" Returns inactive instances of ActivatorModel: SomeModel.objects.inactive() """
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return self.get_query_set().filter(status=ActivatorModel.INACTIVE_STATUS)
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class ActivatorModel(models.Model):
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""" ActivatorModel
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An abstract base class model that provides activate and deactivate fields.
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"""
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INACTIVE_STATUS, ACTIVE_STATUS = range(2)
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STATUS_CHOICES = (
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(INACTIVE_STATUS, _('Inactive')),
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(ACTIVE_STATUS, _('Active')),
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)
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status = models.IntegerField(_('status'), choices=STATUS_CHOICES, default=ACTIVE_STATUS)
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activate_date = models.DateTimeField(blank=True, null=True, help_text=_('keep empty for an immediate activation'))
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deactivate_date = models.DateTimeField(blank=True, null=True, help_text=_('keep empty for indefinite activation'))
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objects = ActivatorModelManager()
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class Meta:
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ordering = ('status', '-activate_date',)
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abstract = True
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def save(self, *args, **kwargs):
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if not self.activate_date:
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self.activate_date = datetime_now()
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super(ActivatorModel, self).save(*args, **kwargs)
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