# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
#
from collections import OrderedDict
+from random import randint
import re
from django.conf import settings
from django.core.cache import caches
-from django.db import models
+from django.db import connection, models, transaction
from django.db.models import permalink
import django.dispatch
from django.contrib.contenttypes.fields import GenericRelation
from catalogue import constants
from catalogue.fields import EbookField
from catalogue.models import Tag, Fragment, BookMedia
-from catalogue.utils import create_zip, split_tags, related_tag_name
+from catalogue.utils import create_zip, split_tags
from catalogue import app_settings
from catalogue import tasks
from newtagging import managers
parent = models.ForeignKey('self', blank=True, null=True,
related_name='children')
-
- _related_info = jsonfield.JSONField(blank=True, null=True, editable=False)
+ ancestor = models.ManyToManyField('self', blank=True, null=True,
+ editable=False, related_name='descendant', symmetrical=False)
objects = models.Manager()
tagged = managers.ModelTaggedItemManager(Tag)
def language_name(self):
return dict(settings.LANGUAGES).get(self.language_code(), "")
- def book_tag_slug(self):
- return ('l-' + self.slug)[:120]
-
- def book_tag(self):
- slug = self.book_tag_slug()
- book_tag, created = Tag.objects.get_or_create(slug=slug, category='book')
- if created:
- book_tag.name = self.title[:50]
- book_tag.sort_key = self.title.lower()
- book_tag.save()
- return book_tag
-
def has_media(self, type_):
if type_ in Book.formats:
return bool(getattr(self, "%s_file" % type_))
if self.id is None:
return
- type(self).objects.filter(pk=self.pk).update(_related_info=None)
# Fragment.short_html relies on book's tags, so reset it here too
for fragm in self.fragments.all().iterator():
fragm.reset_short_html()
if old_cover:
notify_cover_changed.append(child)
+ cls.fix_tree_tags()
+
# No saves beyond this point.
# Build cover.
cls.published.send(sender=book)
return book
- def fix_tree_tags(self):
- """Fixes the l-tags on the book's subtree.
-
- Makes sure that:
- * the book has its parents book-tags,
- * its fragments have the book's and its parents book-tags,
- * runs those for every child book too,
- * touches all relevant tags,
- * resets tag and theme counter on the book and its ancestry.
- """
- def fix_subtree(book, parent_tags):
- affected_tags = set(book.tags)
- book.tags = list(book.tags.exclude(category='book')) + parent_tags
- sub_parent_tags = parent_tags + [book.book_tag()]
- for frag in book.fragments.all():
- affected_tags.update(frag.tags)
- frag.tags = list(frag.tags.exclude(category='book')
- ) + sub_parent_tags
- for child in book.children.all():
- affected_tags.update(fix_subtree(child, sub_parent_tags))
- return affected_tags
-
- parent_tags = []
- parent = self.parent
- while parent is not None:
- parent_tags.append(parent.book_tag())
- parent = parent.parent
-
- affected_tags = fix_subtree(self, parent_tags)
- for tag in affected_tags:
- tasks.touch_tag(tag)
-
- book = self
- while book is not None:
- book.reset_tag_counter()
- book.reset_theme_counter()
- book = book.parent
+ @classmethod
+ def fix_tree_tags(cls):
+ """Fixes the ancestry cache."""
+ # TODO: table names
+ with transaction.atomic():
+ cursor = connection.cursor()
+ if connection.vendor == 'postgres':
+ cursor.execute("TRUNCATE catalogue_book_ancestor")
+ cursor.execute("""
+ WITH RECURSIVE ancestry AS (
+ SELECT book.id, book.parent_id
+ FROM catalogue_book AS book
+ WHERE book.parent_id IS NOT NULL
+ UNION
+ SELECT ancestor.id, book.parent_id
+ FROM ancestry AS ancestor, catalogue_book AS book
+ WHERE ancestor.parent_id = book.id
+ AND book.parent_id IS NOT NULL
+ )
+ INSERT INTO catalogue_book_ancestor
+ (from_book_id, to_book_id)
+ SELECT id, parent_id
+ FROM ancestry
+ ORDER BY id;
+ """)
+ else:
+ cursor.execute("DELETE FROM catalogue_book_ancestor")
+ for b in cls.objects.exclude(parent=None):
+ parent = b.parent
+ while parent is not None:
+ b.ancestor.add(parent)
+ parent = parent.parent
def cover_info(self, inherit=True):
"""Returns a dictionary to serve as fallback for BookInfo.
info = parent_info
return info
+ def related_themes(self):
+ return Tag.objects.usage_for_queryset(
+ Fragment.objects.filter(models.Q(book=self) | models.Q(book__ancestor=self)),
+ counts=True).filter(category='theme')
+
def parent_cover_changed(self):
"""Called when parent book's cover image is changed."""
if not self.cover_info(inherit=False):
"""Find other versions (i.e. in other languages) of the book."""
return type(self).objects.filter(common_slug=self.common_slug).exclude(pk=self.pk)
- def related_info(self):
- """Keeps info about related objects (tags, media) in cache field."""
- if self._related_info is not None:
- return self._related_info
- else:
- rel = {'tags': {}, 'media': {}}
-
- tags = self.tags.filter(category__in=(
- 'author', 'kind', 'genre', 'epoch'))
- tags = split_tags(tags)
- for category in tags:
- cat = []
- for tag in tags[category]:
- tag_info = {'slug': tag.slug, 'name': tag.name}
- for lc, ln in settings.LANGUAGES:
- tag_name = getattr(tag, "name_%s" % lc)
- if tag_name:
- tag_info["name_%s" % lc] = tag_name
- cat.append(tag_info)
- rel['tags'][category] = cat
-
- for media_format in BookMedia.formats:
- rel['media'][media_format] = self.has_media(media_format)
-
- book = self
- parents = []
- while book.parent:
- parents.append((book.parent.title, book.parent.slug))
- book = book.parent
- parents = parents[::-1]
- if parents:
- rel['parents'] = parents
-
- if self.pk:
- type(self).objects.filter(pk=self.pk).update(_related_info=rel)
- return rel
-
- def related_themes(self):
- theme_counter = self.theme_counter
- book_themes = list(Tag.objects.filter(pk__in=theme_counter.keys()))
- for tag in book_themes:
- tag.count = theme_counter[tag.pk]
- return book_themes
-
- def reset_tag_counter(self):
- if self.id is None:
- return
-
- cache_key = "Book.tag_counter/%d" % self.id
- permanent_cache.delete(cache_key)
- if self.parent:
- self.parent.reset_tag_counter()
-
- @property
- def tag_counter(self):
- if self.id:
- cache_key = "Book.tag_counter/%d" % self.id
- tags = permanent_cache.get(cache_key)
- else:
- tags = None
-
- if tags is None:
- tags = {}
- for child in self.children.all().order_by().iterator():
- for tag_pk, value in child.tag_counter.iteritems():
- tags[tag_pk] = tags.get(tag_pk, 0) + value
- for tag in self.tags.exclude(category__in=('book', 'theme', 'set')).order_by().iterator():
- tags[tag.pk] = 1
-
- if self.id:
- permanent_cache.set(cache_key, tags)
- return tags
-
- def reset_theme_counter(self):
- if self.id is None:
- return
-
- cache_key = "Book.theme_counter/%d" % self.id
- permanent_cache.delete(cache_key)
- if self.parent:
- self.parent.reset_theme_counter()
-
- @property
- def theme_counter(self):
- if self.id:
- cache_key = "Book.theme_counter/%d" % self.id
- tags = permanent_cache.get(cache_key)
- else:
- tags = None
-
- if tags is None:
- tags = {}
- for fragment in Fragment.tagged.with_any([self.book_tag()]).order_by().iterator():
- for tag in fragment.tags.filter(category='theme').order_by().iterator():
- tags[tag.pk] = tags.get(tag.pk, 0) + 1
-
- if self.id:
- permanent_cache.set(cache_key, tags)
- return tags
+ def parents(self):
+ books = []
+ parent = self.parent
+ while parent is not None:
+ books.insert(0, parent)
+ parent = parent.parent
+ return books
def pretty_title(self, html_links=False):
- book = self
- rel_info = book.related_info()
- names = [(related_tag_name(tag), Tag.create_url('author', tag['slug']))
- for tag in rel_info['tags'].get('author', ())]
- if 'parents' in rel_info:
- books = [(name, Book.create_url(slug))
- for name, slug in rel_info['parents']]
- names.extend(reversed(books))
- names.append((self.title, self.get_absolute_url()))
+ names = [(tag.name, tag.get_absolute_url())
+ for tag in self.tags.filter(category='author')]
+ books = self.parents() + [self]
+ names.extend([(b.title, b.get_absolute_url()) for b in books])
if html_links:
names = ['<a href="%s">%s</a>' % (tag[1], tag[0]) for tag in names]
also tagged with those tags.
"""
- # get relevant books and their tags
objects = cls.tagged.with_all(tags)
- parents = objects.exclude(children=None).only('slug')
- # eliminate descendants
- l_tags = Tag.objects.filter(category='book',
- slug__in=[book.book_tag_slug() for book in parents.iterator()])
- descendants_keys = [book.pk for book in cls.tagged.with_any(l_tags).only('pk').iterator()]
- if descendants_keys:
- objects = objects.exclude(pk__in=descendants_keys)
-
- return objects
+ return objects.exclude(ancestor__in=objects)
@classmethod
def book_list(cls, filter=None):
return None, None
def choose_fragment(self):
- tag = self.book_tag()
- fragments = Fragment.tagged.with_any([tag])
- if fragments.exists():
- return fragments.order_by('?')[0]
+ fragments = self.fragments.order_by()
+ fragments_count = fragments.count()
+ if not fragments_count and self.children.exists():
+ fragments = Fragment.objects.filter(book__ancestor=self).order_by()
+ fragments_count = fragments.count()
+ if fragments_count:
+ return fragments[randint(0, fragments_count - 1)]
elif self.parent:
return self.parent.choose_fragment()
else:
return None
+
# add the file fields
for format_ in Book.formats:
field_name = "%s_file" % format_
fnp / wolnelektury.git / blobdiff