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# -*- coding: utf-8 -*-
from django.db import models
from django.db.models.signals import pre_delete
from django.contrib.auth.models import User
from django.utils.translation import ugettext_lazy as _
from tools.storage import OverwriteStorage, file_cleanup
class Archive(models.Model):
"""
model 'Archive' to record uploaded files and provide downloads
"""
title = models.CharField(_("Title"), max_length=100)
pubtime = models.DateTimeField(_("Publish time"), auto_now_add=True)
category = models.ForeignKey('ArchiveCategory', verbose_name=_("Category"))
publisher = models.ForeignKey(User, verbose_name=_("Publisher"))
description = models.TextField(_("Description"))
file = models.FileField(verbose_name=_("File"),
upload_to=lambda instance, filename: u'archive/cat{0}/{1}'.format(instance.category.id, filename),
storage=OverwriteStorage())
class Meta:
verbose_name = _('archive')
verbose_name_plural = _('archives')
ordering = ['category', '-pubtime', 'id']
def __unicode__(self):
return u'Archive #%s: (%s) %s' % (
self.id, self.category.name, self.title)
def show_pubtime(self):
# used in 'list_notice.html' template
return self.pubtime.strftime('%Y-%m-%d')
def save(self, *args, **kwargs):
"""
overwrite the original save method to delete old file
"""
if not self.pk:
# -> create
return super(type(self), self).save(*args, **kwargs)
# already exists -> edit
old_obj = type(self).objects.get(pk=self.pk)
result = super(type(self), self).save(*args, **kwargs)
# if the path is the same, the file is overwritten already
if old_obj.file.name:
# old_obj has file
if not self.file.name:
# new object has no file
old_obj.file.delete(save=False)
elif old_obj.file.path != self.file.path:
# new object has file, and differ from old_obj
old_obj.file.delete(save=False)
#
return result
class ArchiveCategory(models.Model):
"""
model 'NoticeCategory' to provide category selections for 'Notice'
"""
name = models.CharField(_("Category name"), max_length=100)
created_at = models.DateTimeField(_("Created time"), auto_now_add=True)
class Meta:
verbose_name = _('archive category')
verbose_name_plural = _('archive categories')
def __unicode__(self):
return u'ArchiveCategory: %s' % self.name
### connect to signal and sender
pre_delete.connect(file_cleanup, sender=Archive)
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