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from datetime import datetime
import os
from django.db import models
from django.contrib.auth.models import User
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes import generic
from django.utils.translation import ugettext_lazy as _
class AttachmentManager(models.Manager):
def attachments_for_object(self, obj):
object_type = ContentType.objects.get_for_model(obj)
return self.filter(content_type__pk=object_type.id,
object_id=obj.id)
class Attachment(models.Model):
def attachment_upload(instance, filename):
"""Stores the attachment in a "per module/appname/primary key" folder"""
return 'attachments/%s/%s/%s' % (
'%s_%s' % (instance.content_object._meta.app_label,
instance.content_object._meta.object_name.lower()),
instance.content_object.pk,
filename)
objects = AttachmentManager()
content_type = models.ForeignKey(ContentType)
object_id = models.PositiveIntegerField()
content_object = generic.GenericForeignKey('content_type', 'object_id')
creator = models.ForeignKey(User, related_name="created_attachments", verbose_name=_('creator'))
attachment_file = models.FileField(_('attachment'), upload_to=attachment_upload)
created = models.DateTimeField(_('created'), auto_now_add=True)
modified = models.DateTimeField(_('modified'), auto_now=True)
class Meta:
ordering = ['-created']
permissions = (
('delete_foreign_attachments', 'Can delete foreign attachments'),
)
def __unicode__(self):
return '%s attached %s' % (self.creator.username, self.attachment_file.name)
@property
def filename(self):
return os.path.split(self.attachment_file.name)[1]
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