apps/catalogue/models/chunk.py

   1 # -*- coding: utf-8 -*-
   2 #
   3 # This file is part of FNP-Redakcja, licensed under GNU Affero GPLv3 or later.
   4 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   5 #
   6 from django.conf import settings
   7 from django.db import models
   8 from django.db.utils import IntegrityError
   9 from django.template.loader import render_to_string
  10 from django.utils.translation import ugettext_lazy as _
  11 from catalogue.helpers import cached_in_field
  12 from catalogue.managers import VisibleManager
  13 from catalogue.tasks import refresh_instance
  14 from dvcs import models as dvcs_models
  15
  16
  17 class Chunk(dvcs_models.Document):
  18     """ An editable chunk of text. Every Book text is divided into chunks. """
  19     REPO_PATH = settings.CATALOGUE_REPO_PATH
  20
  21     book = models.ForeignKey('Book', editable=False, verbose_name=_('book'))
  22     number = models.IntegerField(_('number'))
  23     title = models.CharField(_('title'), max_length=255, blank=True)
  24     slug = models.SlugField(_('slug'))
  25     gallery_start = models.IntegerField(_('gallery start'), null=True, blank=True, default=1)
  26
  27     # cache
  28     _short_html = models.TextField(null=True, blank=True, editable=False)
  29     _hidden = models.NullBooleanField(editable=False)
  30     _changed = models.NullBooleanField(editable=False)
  31
  32     # managers
  33     objects = models.Manager()
  34     visible_objects = VisibleManager()
  35
  36     class Meta:
  37         app_label = 'catalogue'
  38         unique_together = [['book', 'number'], ['book', 'slug']]
  39         ordering = ['number']
  40         verbose_name = _('chunk')
  41         verbose_name_plural = _('chunks')
  42         permissions = [('can_pubmark', 'Can mark for publishing')]
  43
  44     # Representing
  45     # ============
  46
  47     def __unicode__(self):
  48         return "%d:%d: %s" % (self.book_id, self.number, self.title)
  49
  50     @models.permalink
  51     def get_absolute_url(self):
  52         return ("wiki_editor", [self.book.slug, self.slug])
  53
  54     def pretty_name(self, book_length=None):
  55         title = self.book.title
  56         if self.title:
  57             title += ", %s" % self.title
  58         if book_length > 1:
  59             title += " (%d/%d)" % (self.number, book_length)
  60         return title
  61
  62
  63     # Creating and manipulation
  64     # =========================
  65
  66     def split(self, slug, title='', **kwargs):
  67         """ Create an empty chunk after this one """
  68         self.book.chunk_set.filter(number__gt=self.number).update(
  69                 number=models.F('number')+1)
  70         new_chunk = None
  71         while not new_chunk:
  72             new_slug = self.book.make_chunk_slug(slug)
  73             try:
  74                 new_chunk = self.book.chunk_set.create(number=self.number+1,
  75                     slug=new_slug[:50], title=title[:255], **kwargs)
  76             except IntegrityError:
  77                 pass
  78         return new_chunk
  79
  80     @classmethod
  81     def get(cls, book_slug, chunk_slug=None):
  82         if chunk_slug is None:
  83             return cls.objects.get(book__slug=book_slug, number=1)
  84         else:
  85             return cls.objects.get(book__slug=book_slug, slug=chunk_slug)
  86
  87
  88     # State & cache
  89     # =============
  90
  91     def new_publishable(self):
  92         change = self.publishable()
  93         if not change:
  94             return False
  95         return change.publish_log.exists()
  96
  97     def is_changed(self):
  98         if self.head is None:
  99             return False
 100         return not self.head.publishable
 101     changed = cached_in_field('_changed')(is_changed)
 102
 103     def is_hidden(self):
 104         return self.book.hidden()
 105     hidden = cached_in_field('_hidden')(is_hidden)
 106
 107     @cached_in_field('_short_html')
 108     def short_html(self):
 109         return render_to_string(
 110                     'catalogue/book_list/chunk.html', {'chunk': self})
 111
 112     def touch(self):
 113         update = {
 114             "_changed": self.is_changed(),
 115             "_hidden": self.is_hidden(),
 116             "_short_html": None,
 117         }
 118         Chunk.objects.filter(pk=self.pk).update(**update)
 119         refresh_instance(self)
 120
 121     def refresh(self):
 122         """This should be done offline."""
 123         self.changed
 124         self.hidden
 125         self.short_html