1 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
2 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
4 from collections import defaultdict
5 from random import randint
7 from django.contrib.contenttypes.models import ContentType
8 from django.db.models import Q
9 from django.utils.functional import lazy
10 from catalogue.models import Book, Tag
11 from catalogue import utils
12 from catalogue.tasks import touch_tag
13 from social.models import Cite
16 def likes(user, work, request=None):
17 if not user.is_authenticated:
21 return work.tags.filter(category='set', user=user).exists()
23 if not hasattr(request, 'social_likes'):
24 # tuple: unchecked, checked, liked
25 request.social_likes = defaultdict(lambda: (set(), set(), set()))
27 ct = ContentType.objects.get_for_model(type(work))
28 likes_t = request.social_likes[ct.pk]
29 if work.pk in likes_t[1]:
30 return work.pk in likes_t[2]
32 likes_t[0].add(work.pk)
36 ids = tuple(likes_t[0])
38 likes_t[2].update(Tag.intermediary_table_model.objects.filter(
39 content_type_id=ct.pk, tag__user_id=user.pk,
41 ).distinct().values_list('object_id', flat=True))
42 likes_t[1].update(ids)
43 return work.pk in likes_t[2]
44 return lazy(_likes, bool)()
47 def get_set(user, name):
48 """Returns a tag for use by the user. Creates it, if necessary."""
50 tag = Tag.objects.get(category='set', user=user, name=name)
51 except Tag.DoesNotExist:
52 tag = Tag.objects.create(
53 category='set', user=user, name=name, slug=utils.get_random_hash(name), sort_key=name.lower())
54 except Tag.MultipleObjectsReturned:
55 # fix duplicated noname shelf
56 tags = list(Tag.objects.filter(category='set', user=user, name=name))
58 for other_tag in tags[1:]:
59 for item in other_tag.items.all():
60 Tag.objects.remove_tag(item, other_tag)
61 Tag.objects.add_tag(item, tag)
66 def set_sets(user, work, sets):
67 """Set tags used for given work by a given user."""
69 old_sets = list(work.tags.filter(category='set', user=user))
71 work.tags = sets + list(
72 work.tags.filter(~Q(category='set') | ~Q(user=user)))
74 for shelf in [shelf for shelf in old_sets if shelf not in sets]:
76 for shelf in [shelf for shelf in sets if shelf not in old_sets]:
80 Tag.objects.filter(category='set', user=user, items=None).delete()
82 if isinstance(work, Book):
83 work.update_popularity()
86 def cites_for_tags(tags):
87 """Returns a QuerySet with all Cites for books with given tags."""
88 return Cite.objects.filter(book__in=Book.tagged.with_all(tags))
91 # tag_ids is never used
92 def choose_cite(book_id=None, tag_ids=None):
93 """Choose a cite for main page, for book or for set of tags."""
94 if book_id is not None:
95 cites = Cite.objects.filter(Q(book=book_id) | Q(book__ancestor=book_id))
96 elif tag_ids is not None:
97 tags = Tag.objects.filter(pk__in=tag_ids)
98 cites = cites_for_tags(tags)
100 cites = Cite.objects.all()
101 stickies = cites.filter(sticky=True)
102 count = len(stickies)
108 cite = cites[randint(0, count - 1)]
114 def get_or_choose_cite(request, book_id=None, tag_ids=None):
116 assert request.user.is_staff
117 assert 'banner' in request.GET
118 return Cite.objects.get(pk=request.GET['banner'])
119 except (AssertionError, Cite.DoesNotExist):
120 return choose_cite(book_id, tag_ids)