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annotate gpp/forums/models.py @ 160:2eb3984ccb15

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Implement #45, add a who's online feature for the forums. Created middleware that caches usernames and guest session ids in the cache. Added a tag that displays this info.
author Brian Neal <bgneal@gmail.com>
date Tue, 22 Dec 2009 02:08:05 +0000
parents 48621ba5c385
children f7a6b8fe4556
rev   line source
bgneal@75 1 """
bgneal@75 2 Models for the forums application.
bgneal@75 3 """
bgneal@102 4 import datetime
bgneal@102 5
bgneal@75 6 from django.db import models
bgneal@100 7 from django.db.models import Q
bgneal@75 8 from django.contrib.auth.models import User, Group
bgneal@128 9
bgneal@128 10 from core.markup import site_markup
bgneal@75 11
bgneal@75 12
bgneal@113 13 POST_EDIT_DELTA = datetime.timedelta(seconds=3)
bgneal@113 14
bgneal@113 15
bgneal@75 16 class Category(models.Model):
bgneal@100 17 """
bgneal@100 18 Forums belong to a category, whose access may be assigned to groups.
bgneal@100 19 """
bgneal@75 20 name = models.CharField(max_length=80)
bgneal@75 21 slug = models.SlugField(max_length=80)
bgneal@75 22 position = models.IntegerField(blank=True, default=0)
bgneal@75 23 groups = models.ManyToManyField(Group, blank=True, null=True,
bgneal@75 24 help_text="If groups are assigned to this category, only members" \
bgneal@75 25 " of those groups can view this category.")
bgneal@75 26
bgneal@75 27 class Meta:
bgneal@75 28 ordering = ('position', )
bgneal@75 29 verbose_name_plural = 'Categories'
bgneal@75 30
bgneal@75 31 def __unicode__(self):
bgneal@75 32 return self.name
bgneal@75 33
bgneal@100 34 def can_access(self, user):
bgneal@100 35 """
bgneal@100 36 Checks to see if the given user has permission to access
bgneal@100 37 this category.
bgneal@100 38 If this category has no groups assigned to it, return true.
bgneal@100 39 Else, return true if the user belongs to a group that has been
bgneal@100 40 assigned to this category, and false otherwise.
bgneal@100 41 """
bgneal@100 42 if self.groups.count() == 0:
bgneal@100 43 return True
bgneal@100 44 if user.is_authenticated():
bgneal@100 45 return self.groups.filter(user__pk=user.id).count() > 0
bgneal@100 46 return False
bgneal@100 47
bgneal@100 48
bgneal@100 49 class ForumManager(models.Manager):
bgneal@100 50 """
bgneal@100 51 The manager for the Forum model. Provides a centralized place to
bgneal@100 52 put commonly used and useful queries.
bgneal@100 53 """
bgneal@100 54
bgneal@100 55 def forums_for_user(self, user):
bgneal@100 56 """
bgneal@100 57 Returns a queryset containing the forums that the given user can
bgneal@100 58 "see" due to authenticated status, superuser status and group membership.
bgneal@100 59 """
bgneal@100 60 if user.is_superuser:
bgneal@100 61 qs = self.all()
bgneal@100 62 else:
bgneal@100 63 user_groups = []
bgneal@100 64 if user.is_authenticated():
bgneal@100 65 user_groups = user.groups.all()
bgneal@100 66
bgneal@100 67 qs = self.filter(Q(category__groups__isnull=True) | \
bgneal@100 68 Q(category__groups__in=user_groups))
bgneal@100 69
bgneal@100 70 return qs.select_related('category', 'last_post', 'last_post__user')
bgneal@100 71
bgneal@75 72
bgneal@75 73 class Forum(models.Model):
bgneal@100 74 """
bgneal@100 75 A forum is a collection of topics.
bgneal@100 76 """
bgneal@75 77 category = models.ForeignKey(Category, related_name='forums')
bgneal@75 78 name = models.CharField(max_length=80)
bgneal@75 79 slug = models.SlugField(max_length=80)
bgneal@75 80 description = models.TextField(blank=True, default='')
bgneal@75 81 position = models.IntegerField(blank=True, default=0)
bgneal@75 82 moderators = models.ManyToManyField(Group, blank=True, null=True)
bgneal@75 83
bgneal@75 84 # denormalized fields to reduce database hits
bgneal@75 85 topic_count = models.IntegerField(blank=True, default=0)
bgneal@75 86 post_count = models.IntegerField(blank=True, default=0)
bgneal@75 87 last_post = models.OneToOneField('Post', blank=True, null=True,
bgneal@75 88 related_name='parent_forum')
bgneal@75 89
bgneal@100 90 objects = ForumManager()
bgneal@100 91
bgneal@75 92 class Meta:
bgneal@75 93 ordering = ('position', )
bgneal@75 94
bgneal@75 95 def __unicode__(self):
bgneal@75 96 return self.name
bgneal@75 97
bgneal@81 98 @models.permalink
bgneal@81 99 def get_absolute_url(self):
bgneal@81 100 return ('forums-forum_index', [self.slug])
bgneal@81 101
bgneal@75 102 def topic_count_update(self):
bgneal@75 103 """Call to notify the forum that its topic count has been updated."""
bgneal@75 104 self.topic_count = Topic.objects.filter(forum=self).count()
bgneal@75 105
bgneal@75 106 def post_count_update(self):
bgneal@75 107 """Call to notify the forum that its post count has been updated."""
bgneal@75 108 my_posts = Post.objects.filter(topic__forum=self)
bgneal@75 109 self.post_count = my_posts.count()
bgneal@75 110 if self.post_count > 0:
bgneal@75 111 self.last_post = my_posts[self.post_count - 1]
bgneal@75 112 else:
bgneal@75 113 self.last_post = None
bgneal@75 114
bgneal@112 115 def sync(self):
bgneal@112 116 """
bgneal@112 117 Call to notify the forum that it needs to recompute its
bgneal@112 118 denormalized fields.
bgneal@112 119 """
bgneal@112 120 self.topic_count_update()
bgneal@112 121 self.post_count_update()
bgneal@112 122
bgneal@107 123 def last_post_pre_delete(self):
bgneal@107 124 """
bgneal@107 125 Call this function prior to deleting the last post in the forum.
bgneal@107 126 A new last post will be found, if one exists.
bgneal@107 127 This is to avoid the Django cascading delete issue.
bgneal@107 128 """
bgneal@107 129 try:
bgneal@107 130 self.last_post = \
bgneal@107 131 Post.objects.filter(topic__forum=self).exclude(pk=self.last_post.pk).latest()
bgneal@107 132 except Post.DoesNotExist:
bgneal@107 133 self.last_post = None
bgneal@107 134
bgneal@113 135 def catchup(self, user, flv=None):
bgneal@113 136 """
bgneal@113 137 Call to mark this forum all caught up for the given user (i.e. mark all topics
bgneal@113 138 read for this user).
bgneal@113 139 """
bgneal@113 140 TopicLastVisit.objects.filter(user=user, topic__forum=self).delete()
bgneal@113 141 if flv is None:
bgneal@113 142 try:
bgneal@113 143 flv = ForumLastVisit.objects.get(user=user, forum=self)
bgneal@113 144 except ForumLastVisit.DoesNotExist:
bgneal@113 145 flv = ForumLastVisit(user=user, forum=self)
bgneal@113 146
bgneal@113 147 now = datetime.datetime.now()
bgneal@113 148 flv.begin_date = now
bgneal@113 149 flv.end_date = now
bgneal@113 150 flv.save()
bgneal@113 151
bgneal@75 152
bgneal@75 153 class Topic(models.Model):
bgneal@100 154 """
bgneal@100 155 A topic is a thread of discussion, consisting of a series of posts.
bgneal@100 156 """
bgneal@75 157 forum = models.ForeignKey(Forum, related_name='topics')
bgneal@75 158 name = models.CharField(max_length=255)
bgneal@75 159 creation_date = models.DateTimeField(auto_now_add=True)
bgneal@75 160 user = models.ForeignKey(User)
bgneal@75 161 view_count = models.IntegerField(blank=True, default=0)
bgneal@75 162 sticky = models.BooleanField(blank=True, default=False)
bgneal@75 163 locked = models.BooleanField(blank=True, default=False)
bgneal@75 164
bgneal@75 165 # denormalized fields to reduce database hits
bgneal@75 166 post_count = models.IntegerField(blank=True, default=0)
bgneal@102 167 update_date = models.DateTimeField()
bgneal@75 168 last_post = models.OneToOneField('Post', blank=True, null=True,
bgneal@75 169 related_name='parent_topic')
bgneal@75 170
bgneal@75 171 class Meta:
bgneal@75 172 ordering = ('-sticky', '-update_date', )
bgneal@75 173
bgneal@75 174 def __unicode__(self):
bgneal@75 175 return self.name
bgneal@75 176
bgneal@82 177 @models.permalink
bgneal@82 178 def get_absolute_url(self):
bgneal@82 179 return ('forums-topic_index', [self.pk])
bgneal@82 180
bgneal@75 181 def post_count_update(self):
bgneal@75 182 """
bgneal@75 183 Call this function to notify the topic instance that its post count
bgneal@75 184 has changed.
bgneal@75 185 """
bgneal@75 186 my_posts = Post.objects.filter(topic=self)
bgneal@75 187 self.post_count = my_posts.count()
bgneal@75 188 if self.post_count > 0:
bgneal@75 189 self.last_post = my_posts[self.post_count - 1]
bgneal@75 190 self.update_date = self.last_post.creation_date
bgneal@75 191 else:
bgneal@75 192 self.last_post = None
bgneal@75 193 self.update_date = self.creation_date
bgneal@75 194
bgneal@83 195 def reply_count(self):
bgneal@83 196 """
bgneal@83 197 Returns the number of replies to a topic. The first post
bgneal@83 198 doesn't count as a reply.
bgneal@83 199 """
bgneal@83 200 if self.post_count > 1:
bgneal@83 201 return self.post_count - 1
bgneal@83 202 return 0
bgneal@83 203
bgneal@102 204 def save(self, *args, **kwargs):
bgneal@102 205 if not self.id:
bgneal@102 206 now = datetime.datetime.now()
bgneal@102 207 self.creation_date = now
bgneal@102 208 self.update_date = now
bgneal@102 209
bgneal@102 210 super(Topic, self).save(*args, **kwargs)
bgneal@102 211
bgneal@107 212 def last_post_pre_delete(self):
bgneal@107 213 """
bgneal@107 214 Call this function prior to deleting the last post in the topic.
bgneal@107 215 A new last post will be found, if one exists.
bgneal@107 216 This is to avoid the Django cascading delete issue.
bgneal@107 217 """
bgneal@107 218 try:
bgneal@107 219 self.last_post = \
bgneal@107 220 Post.objects.filter(topic=self).exclude(pk=self.last_post.pk).latest()
bgneal@107 221 except Post.DoesNotExist:
bgneal@107 222 self.last_post = None
bgneal@107 223
bgneal@75 224
bgneal@75 225 class Post(models.Model):
bgneal@100 226 """
bgneal@100 227 A post is an instance of a user's single contribution to a topic.
bgneal@100 228 """
bgneal@75 229 topic = models.ForeignKey(Topic, related_name='posts')
bgneal@75 230 user = models.ForeignKey(User, related_name='posts')
bgneal@75 231 creation_date = models.DateTimeField(auto_now_add=True)
bgneal@115 232 update_date = models.DateTimeField(null=True)
bgneal@75 233 body = models.TextField()
bgneal@75 234 html = models.TextField()
bgneal@83 235 user_ip = models.IPAddressField(blank=True, default='', null=True)
bgneal@75 236
bgneal@75 237 class Meta:
bgneal@97 238 ordering = ('creation_date', )
bgneal@107 239 get_latest_by = 'creation_date'
bgneal@75 240
bgneal@91 241 @models.permalink
bgneal@91 242 def get_absolute_url(self):
bgneal@91 243 return ('forums-goto_post', [self.pk])
bgneal@91 244
bgneal@75 245 def summary(self):
bgneal@75 246 LIMIT = 50
bgneal@75 247 if len(self.body) < LIMIT:
bgneal@75 248 return self.body
bgneal@75 249 return self.body[:LIMIT] + '...'
bgneal@75 250
bgneal@75 251 def __unicode__(self):
bgneal@75 252 return self.summary()
bgneal@75 253
bgneal@75 254 def save(self, *args, **kwargs):
bgneal@128 255 self.html = site_markup(self.body)
bgneal@75 256 super(Post, self).save(*args, **kwargs)
bgneal@75 257
bgneal@75 258 def delete(self, *args, **kwargs):
bgneal@75 259 first_post_id = self.topic.posts.all()[0].id
bgneal@75 260 super(Post, self).delete(*args, **kwargs)
bgneal@75 261 if self.id == first_post_id:
bgneal@75 262 self.topic.delete()
bgneal@75 263
bgneal@113 264 def has_been_edited(self):
bgneal@115 265 return self.update_date is not None
bgneal@115 266
bgneal@115 267 def touch(self):
bgneal@115 268 """Call this function to indicate the post has been edited."""
bgneal@115 269 self.update_date = datetime.datetime.now()
bgneal@113 270
bgneal@98 271
bgneal@98 272 class FlaggedPost(models.Model):
bgneal@98 273 """This model represents a user flagging a post as inappropriate."""
bgneal@98 274 user = models.ForeignKey(User)
bgneal@98 275 post = models.ForeignKey(Post)
bgneal@98 276 flag_date = models.DateTimeField(auto_now_add=True)
bgneal@98 277
bgneal@98 278 def __unicode__(self):
bgneal@98 279 return u'Post ID %s flagged by %s' % (self.post.id, self.user.username)
bgneal@98 280
bgneal@98 281 class Meta:
bgneal@98 282 ordering = ('flag_date', )
bgneal@98 283
bgneal@98 284 def get_post_url(self):
bgneal@98 285 return '<a href="%s">Post</a>' % self.post.get_absolute_url()
bgneal@98 286 get_post_url.allow_tags = True
bgneal@98 287
bgneal@113 288
bgneal@113 289 class ForumLastVisit(models.Model):
bgneal@113 290 """
bgneal@113 291 This model records the last time a user visited a forum.
bgneal@113 292 It is used to compute if a user has unread topics in a forum.
bgneal@113 293 We keep track of a window of time, delimited by begin_date and end_date.
bgneal@113 294 Topics updated within this window are tracked, and may have TopicLastVisit
bgneal@113 295 objects.
bgneal@113 296 Marking a forum as all read sets the begin_date equal to the end_date.
bgneal@113 297 """
bgneal@113 298 user = models.ForeignKey(User)
bgneal@113 299 forum = models.ForeignKey(Forum)
bgneal@113 300 begin_date = models.DateTimeField()
bgneal@113 301 end_date = models.DateTimeField()
bgneal@113 302
bgneal@113 303 class Meta:
bgneal@113 304 unique_together = ('user', 'forum')
bgneal@113 305 ordering = ('-end_date', )
bgneal@113 306
bgneal@113 307 def __unicode__(self):
bgneal@113 308 return u'Forum: %d User: %d Date: %s' % (self.forum.id, self.user.id,
bgneal@113 309 self.end_date.strftime('%Y-%m-%d %H:%M:%S'))
bgneal@113 310
bgneal@113 311 def is_caught_up(self):
bgneal@113 312 return self.begin_date == self.end_date
bgneal@113 313
bgneal@113 314
bgneal@113 315 class TopicLastVisit(models.Model):
bgneal@113 316 """
bgneal@113 317 This model records the last time a user read a topic.
bgneal@113 318 Objects of this class exist for the window specified in the
bgneal@113 319 corresponding ForumLastVisit object.
bgneal@113 320 """
bgneal@113 321 user = models.ForeignKey(User)
bgneal@113 322 topic = models.ForeignKey(Topic)
bgneal@113 323 last_visit = models.DateTimeField()
bgneal@113 324
bgneal@113 325 class Meta:
bgneal@113 326 unique_together = ('user', 'topic')
bgneal@113 327 ordering = ('-last_visit', )
bgneal@113 328
bgneal@113 329 def __unicode__(self):
bgneal@113 330 return u'Topic: %d User: %d Date: %s' % (self.topic.id, self.user.id,
bgneal@113 331 self.last_visit.strftime('%Y-%m-%d %H:%M:%S'))
bgneal@113 332
bgneal@113 333 def save(self, *args, **kwargs):
bgneal@116 334 if self.id is None:
bgneal@113 335 self.touch()
bgneal@113 336 super(TopicLastVisit, self).save(*args, **kwargs)
bgneal@113 337
bgneal@113 338 def touch(self):
bgneal@113 339 self.last_visit = datetime.datetime.now()