62 lines
2.3 KiB
Python
62 lines
2.3 KiB
Python
from __future__ import unicode_literals
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import logging
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from django.contrib.contenttypes import generic
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from django.contrib.contenttypes.models import ContentType
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from django.core.urlresolvers import reverse
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from django.db import models
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from django.utils.encoding import python_2_unicode_compatible
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from django.utils.translation import ugettext_lazy as _
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from documents.models import Document
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from .events import event_document_check_out
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from .exceptions import DocumentAlreadyCheckedOut
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from .managers import DocumentCheckoutManager
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logger = logging.getLogger(__name__)
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@python_2_unicode_compatible
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class DocumentCheckout(models.Model):
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"""
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Model to store the state and information of a document checkout
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"""
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document = models.ForeignKey(Document, verbose_name=_('Document'), unique=True)
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checkout_datetime = models.DateTimeField(verbose_name=_('Check out date and time'), auto_now_add=True)
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expiration_datetime = models.DateTimeField(verbose_name=_('Check out expiration date and time'), help_text=_('Amount of time to hold the document checked out in minutes.'))
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# TODO: simplify user_object to an instance of User
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user_content_type = models.ForeignKey(ContentType, null=True, blank=True) # blank and null added for ease of db migration
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user_object_id = models.PositiveIntegerField(null=True, blank=True)
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user_object = generic.GenericForeignKey(ct_field='user_content_type', fk_field='user_object_id')
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block_new_version = models.BooleanField(default=True, verbose_name=_('Block new version upload'), help_text=_('Do not allow new version of this document to be uploaded.'))
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# block_metadata
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# block_editing
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# block tag add/remove
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objects = DocumentCheckoutManager()
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def __str__(self):
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return unicode(self.document)
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def save(self, *args, **kwargs):
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new_checkout = not self.pk
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if not new_checkout or self.document.is_checked_out():
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raise DocumentAlreadyCheckedOut
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result = super(DocumentCheckout, self).save(*args, **kwargs)
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if new_checkout:
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event_document_check_out.commit(actor=self.user_object, target=self.document)
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return result
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def get_absolute_url(self):
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reverse('checkout:checkout_info', args=[self.document.pk])
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class Meta:
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verbose_name = _('Document checkout')
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verbose_name_plural = _('Document checkouts')
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