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     slug = models.SlugField(_('slug'))
  24     title = models.CharField(_('title'), max_length=255, blank=True)
  25
  26     # cache
  27     _short_html = models.TextField(null=True, blank=True, editable=False)
  28     _hidden = models.NullBooleanField(editable=False)
  29     _changed = models.NullBooleanField(editable=False)
  30
  31     # managers
  32     objects = models.Manager()
  33     visible_objects = VisibleManager()
  34
  35     class Meta:
  36         app_label = 'catalogue'
  37         unique_together = [['book', 'number'], ['book', 'slug']]
  38         ordering = ['number']
  39         verbose_name = _('chunk')
  40         verbose_name_plural = _('chunks')
  41
  42     # Representing
  43     # ============
  44
  45     def __unicode__(self):
  46         return "%d:%d: %s" % (self.book_id, self.number, self.title)
  47
  48     @models.permalink
  49     def get_absolute_url(self):
  50         return ("wiki_editor", [self.book.slug, self.slug])
  51
  52     def pretty_name(self, book_length=None):
  53         title = self.book.title
  54         if self.title:
  55             title += ", %s" % self.title
  56         if book_length > 1:
  57             title += " (%d/%d)" % (self.number, book_length)
  58         return title
  59
  60
  61     # Creating and manipulation
  62     # =========================
  63
  64     def split(self, slug, title='', adjust_slug=False, **kwargs):
  65         """ Create an empty chunk after this one """
  66         self.book.chunk_set.filter(number__gt=self.number).update(
  67                 number=models.F('number')+1)
  68         new_chunk = None
  69         while not new_chunk:
  70             new_slug = self.book.make_chunk_slug(slug)
  71             try:
  72                 new_chunk = self.book.chunk_set.create(number=self.number+1,
  73                     slug=new_slug[:50], title=title[:255], **kwargs)
  74             except IntegrityError:
  75                 pass
  76         return new_chunk
  77
  78     @classmethod
  79     def get(cls, book_slug, chunk_slug=None):
  80         if chunk_slug is None:
  81             return cls.objects.get(book__slug=book_slug, number=1)
  82         else:
  83             return cls.objects.get(book__slug=book_slug, slug=chunk_slug)
  84
  85
  86     # State & cache
  87     # =============
  88
  89     def new_publishable(self):
  90         change = self.publishable()
  91         if not change:
  92             return False
  93         return change.publish_log.exists()
  94
  95     def is_changed(self):
  96         if self.head is None:
  97             return False
  98         return not self.head.publishable
  99     changed = cached_in_field('_changed')(is_changed)
 100
 101     def is_hidden(self):
 102         return self.book.hidden()
 103     hidden = cached_in_field('_hidden')(is_hidden)
 104
 105     @cached_in_field('_short_html')
 106     def short_html(self):
 107         return render_to_string(
 108                     'catalogue/book_list/chunk.html', {'chunk': self})
 109
 110     def touch(self):
 111         update = {
 112             "_changed": self.is_changed(),
 113             "_hidden": self.is_hidden(),
 114             "_short_html": None,
 115         }
 116         Chunk.objects.filter(pk=self.pk).update(**update)
 117         refresh_instance(self)
 118
 119     def refresh(self):
 120         """This should be done offline."""
 121         self.changed
 122         self.hidden
 123         self.short_html