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annotate gpp/forums/unread.py @ 232:a46788862737

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Implement a forum favorites feature for #82
author Brian Neal <bgneal@gmail.com>
date Sun, 01 Aug 2010 21:26:12 +0000
parents d77e0dc772ad
children 7e19180b128d
rev   line source
bgneal@113 1 """
bgneal@113 2 This file contains routines for implementing the "has unread" feature.
bgneal@113 3 Forums, topics, and posts are displayed with a visual indication if they have
bgneal@113 4 been read or not.
bgneal@113 5 """
bgneal@113 6 import datetime
bgneal@113 7
bgneal@167 8 from django.db.models import Q
bgneal@167 9
bgneal@167 10 from forums.models import ForumLastVisit, TopicLastVisit, Topic, Forum
bgneal@113 11
bgneal@113 12
bgneal@113 13 THRESHOLD = datetime.timedelta(days=7)
bgneal@113 14
bgneal@114 15 #######################################################################
bgneal@113 16
bgneal@113 17 def get_forum_unread_status(qs, user):
bgneal@113 18 if not user.is_authenticated():
bgneal@113 19 for forum in qs:
bgneal@113 20 forum.has_unread = False
bgneal@113 21 return
bgneal@113 22
bgneal@113 23 now = datetime.datetime.now()
bgneal@113 24 min_date = now - THRESHOLD
bgneal@113 25
bgneal@113 26 # retrieve ForumLastVisit records in one SQL query
bgneal@113 27 forum_ids = [forum.id for forum in qs]
bgneal@113 28 flvs = ForumLastVisit.objects.filter(user=user,
bgneal@113 29 forum__in=forum_ids).select_related()
bgneal@113 30 flvs = dict([(flv.forum.id, flv) for flv in flvs])
bgneal@113 31
bgneal@113 32 for forum in qs:
bgneal@113 33 # Edge case: forum has no posts
bgneal@113 34 if forum.last_post is None:
bgneal@113 35 forum.has_unread = False
bgneal@113 36 continue
bgneal@113 37
bgneal@113 38 # Get the ForumLastVisit record
bgneal@113 39 if forum.id in flvs:
bgneal@113 40 flv = flvs[forum.id]
bgneal@113 41 else:
bgneal@113 42 # One doesn't exist, create a default one for next time,
bgneal@113 43 # mark it as having no unread topics, and bail.
bgneal@113 44 flv = ForumLastVisit(user=user, forum=forum)
bgneal@113 45 flv.begin_date = now
bgneal@113 46 flv.end_date = now
bgneal@113 47 flv.save()
bgneal@113 48 forum.has_unread = False
bgneal@113 49 continue
bgneal@113 50
bgneal@113 51 # If the last visit record was too far in the past,
bgneal@113 52 # catch that user up and mark as no unreads.
bgneal@113 53 if now - flv.end_date > THRESHOLD:
bgneal@113 54 forum.catchup(user, flv)
bgneal@113 55 forum.has_unread = False
bgneal@113 56 continue
bgneal@113 57
bgneal@113 58 # Check the easy cases first. Check the last_post in the
bgneal@113 59 # forum. If created after the end_date in our window, there
bgneal@113 60 # are new posts. Likewise, if before the begin_date in our window,
bgneal@113 61 # there are no new posts.
bgneal@113 62 if forum.last_post.creation_date > flv.end_date:
bgneal@113 63 forum.has_unread = True
bgneal@113 64 elif forum.last_post.creation_date < flv.begin_date:
bgneal@113 65 if not flv.is_caught_up():
bgneal@113 66 forum.catchup(user, flv)
bgneal@113 67 forum.has_unread = False
bgneal@113 68 else:
bgneal@113 69 # Going to have to examine the topics in our window.
bgneal@113 70 # First adjust our window if it is too old.
bgneal@113 71 if now - flv.begin_date > THRESHOLD:
bgneal@113 72 flv.begin_date = min_date
bgneal@113 73 flv.save()
bgneal@113 74 TopicLastVisit.objects.filter(user=user, topic__forum=forum,
bgneal@113 75 last_visit__lt=min_date).delete()
bgneal@113 76
bgneal@148 77 topics = Topic.objects.filter(forum=forum,
bgneal@148 78 creation_date__gt=flv.begin_date)
bgneal@113 79 tracked_topics = TopicLastVisit.objects.filter(user=user,
bgneal@113 80 topic__forum=forum, last_visit__gt=flv.begin_date)
bgneal@113 81
bgneal@113 82 # If the number of topics created since our window was started
bgneal@113 83 # is greater than the tracked topic records, then there are new
bgneal@113 84 # posts.
bgneal@113 85 if topics.count() > tracked_topics.count():
bgneal@113 86 forum.has_unread = True
bgneal@113 87 continue
bgneal@113 88
bgneal@113 89 tracked_dict = dict([(t.id, t) for t in tracked_topics])
bgneal@113 90
bgneal@113 91 for topic in topics:
bgneal@113 92 if topic.id in tracked_dict:
bgneal@113 93 if topic.update_date > tracked_dict[topic.id].last_visit:
bgneal@113 94 forum.has_unread = True
bgneal@113 95 continue
bgneal@113 96 else:
bgneal@113 97 forum.has_unread = True
bgneal@113 98 continue
bgneal@113 99
bgneal@113 100 # If we made it through the above loop without continuing, then
bgneal@113 101 # we are all caught up.
bgneal@113 102 forum.catchup(user, flv)
bgneal@113 103 forum.has_unread = False
bgneal@114 104
bgneal@114 105 #######################################################################
bgneal@114 106
bgneal@114 107 def get_topic_unread_status(forum, topics, user):
bgneal@114 108
bgneal@114 109 # Edge case: no topics
bgneal@114 110 if forum.last_post is None:
bgneal@114 111 return
bgneal@114 112
bgneal@114 113 # This service isn't provided to unauthenticated users
bgneal@114 114 if not user.is_authenticated():
bgneal@114 115 for topic in topics:
bgneal@114 116 topic.has_unread = False
bgneal@114 117 return
bgneal@114 118
bgneal@114 119 now = datetime.datetime.now()
bgneal@114 120
bgneal@114 121 # Get the ForumLastVisit record
bgneal@114 122 try:
bgneal@114 123 flv = ForumLastVisit.objects.get(forum=forum, user=user)
bgneal@114 124 except ForumLastVisit.DoesNotExist:
bgneal@114 125 # One doesn't exist, create a default one for next time,
bgneal@114 126 # mark it as having no unread topics, and bail.
bgneal@114 127 flv = ForumLastVisit(user=user, forum=forum)
bgneal@114 128 flv.begin_date = now
bgneal@114 129 flv.end_date = now
bgneal@114 130 flv.save()
bgneal@114 131 for topic in topics:
bgneal@114 132 topic.has_unread = False
bgneal@114 133 return
bgneal@114 134
bgneal@114 135 # Are all the posts before our window? If so, all have been read.
bgneal@114 136 if forum.last_post.creation_date < flv.begin_date:
bgneal@114 137 for topic in topics:
bgneal@114 138 topic.has_unread = False
bgneal@114 139 return
bgneal@114 140
bgneal@114 141 topic_ids = [topic.id for topic in topics]
bgneal@114 142 tlvs = TopicLastVisit.objects.filter(user=user, topic__id__in=topic_ids)
bgneal@114 143 tlvs = dict([(tlv.topic.id, tlv) for tlv in tlvs])
bgneal@114 144
bgneal@114 145 # Otherwise we have to go through the topics one by one:
bgneal@114 146 for topic in topics:
bgneal@114 147 if topic.update_date < flv.begin_date:
bgneal@114 148 topic.has_unread = False
bgneal@114 149 elif topic.update_date > flv.end_date:
bgneal@114 150 topic.has_unread = True
bgneal@114 151 elif topic.id in tlvs:
bgneal@114 152 topic.has_unread = topic.update_date > tlvs[topic.id].last_visit
bgneal@114 153 else:
bgneal@114 154 topic.has_unread = True
bgneal@114 155
bgneal@114 156 #######################################################################
bgneal@114 157
bgneal@114 158 def get_post_unread_status(topic, posts, user):
bgneal@114 159 # This service isn't provided to unauthenticated users
bgneal@114 160 if not user.is_authenticated():
bgneal@114 161 for post in posts:
bgneal@114 162 post.unread = False
bgneal@114 163 return
bgneal@114 164
bgneal@114 165 # Get the ForumLastVisit record
bgneal@114 166 try:
bgneal@114 167 flv = ForumLastVisit.objects.get(forum=topic.forum, user=user)
bgneal@114 168 except ForumLastVisit.DoesNotExist:
bgneal@114 169 # One doesn't exist, all posts are old.
bgneal@114 170 for post in posts:
bgneal@114 171 post.unread = False
bgneal@114 172 return
bgneal@114 173
bgneal@114 174 # Are all the posts before our window? If so, all have been read.
bgneal@114 175 if topic.last_post.creation_date < flv.begin_date:
bgneal@114 176 for post in posts:
bgneal@114 177 post.unread = False
bgneal@114 178 return
bgneal@114 179
bgneal@114 180 # Do we have a topic last visit record for this topic?
bgneal@114 181
bgneal@114 182 try:
bgneal@114 183 tlv = TopicLastVisit.objects.get(user=user, topic=topic)
bgneal@114 184 except TopicLastVisit.DoesNotExist:
bgneal@114 185 # No we don't, we could be all caught up, or all are new
bgneal@114 186 for post in posts:
bgneal@114 187 post.unread = post.creation_date > flv.end_date
bgneal@114 188 else:
bgneal@114 189 for post in posts:
bgneal@114 190 post.unread = post.creation_date > tlv.last_visit
bgneal@167 191
bgneal@167 192 #######################################################################
bgneal@167 193
bgneal@167 194 def get_unread_topics(user):
bgneal@167 195 """Returns a list of topics the user hasn't read yet."""
bgneal@167 196
bgneal@167 197 # This is only available to authenticated users
bgneal@167 198 if not user.is_authenticated():
bgneal@167 199 return []
bgneal@167 200
bgneal@167 201 now = datetime.datetime.now()
bgneal@167 202
bgneal@167 203 # Obtain list of forums the user can view
bgneal@167 204 forums = Forum.objects.forums_for_user(user)
bgneal@167 205
bgneal@167 206 # Get forum last visit records for the forum ids
bgneal@167 207 flvs = ForumLastVisit.objects.filter(user=user,
bgneal@167 208 forum__in=forums).select_related()
bgneal@167 209 flvs = dict([(flv.forum.id, flv) for flv in flvs])
bgneal@167 210
bgneal@167 211 unread_topics = []
bgneal@167 212 topics = Topic.objects.none()
bgneal@167 213 for forum in forums:
bgneal@167 214 # if the user hasn't visited the forum, create a last
bgneal@167 215 # visit record set to "now"
bgneal@167 216 if not forum.id in flvs:
bgneal@167 217 flv = ForumLastVisit(user=user, forum=forum, begin_date=now,
bgneal@167 218 end_date=now)
bgneal@167 219 flv.save()
bgneal@167 220 else:
bgneal@167 221 flv = flvs[forum.id]
bgneal@167 222 topics |= Topic.objects.filter(forum=forum,
bgneal@168 223 update_date__gt=flv.begin_date).order_by('-update_date').select_related(
bgneal@168 224 'forum', 'user', 'last_post', 'last_post__user')
bgneal@167 225
bgneal@167 226 if topics is not None:
bgneal@167 227 # get all topic last visit records for the topics of interest
bgneal@167 228
bgneal@167 229 tlvs = TopicLastVisit.objects.filter(user=user, topic__in=topics)
bgneal@167 230 tlvs = dict([(tlv.topic.id, tlv) for tlv in tlvs])
bgneal@167 231
bgneal@167 232 for topic in topics:
bgneal@167 233 if topic.id in tlvs:
bgneal@167 234 tlv = tlvs[topic.id]
bgneal@167 235 if topic.update_date > tlv.last_visit:
bgneal@167 236 unread_topics.append(topic)
bgneal@167 237 else:
bgneal@167 238 unread_topics.append(topic)
bgneal@167 239
bgneal@167 240 return unread_topics