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annotate gpp/forums/models.py @ 387:b15726767ab8

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Fixing #191; terrible performance on the combined forums RSS feed query. Use an .extra() clause to force the WHERE on a query to use the primary key.
author Brian Neal <bgneal@gmail.com>
date Sat, 19 Mar 2011 01:52:41 +0000
parents 9fcd366f22dc
children 9af6bd45c1f8
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@387 9 from django.core.cache import cache
bgneal@128 10
bgneal@128 11 from core.markup import site_markup
bgneal@285 12 from oembed.models import Oembed
bgneal@75 13
bgneal@75 14
bgneal@75 15 class Category(models.Model):
bgneal@100 16 """
bgneal@100 17 Forums belong to a category, whose access may be assigned to groups.
bgneal@100 18 """
bgneal@75 19 name = models.CharField(max_length=80)
bgneal@75 20 slug = models.SlugField(max_length=80)
bgneal@75 21 position = models.IntegerField(blank=True, default=0)
bgneal@75 22 groups = models.ManyToManyField(Group, blank=True, null=True,
bgneal@75 23 help_text="If groups are assigned to this category, only members" \
bgneal@75 24 " of those groups can view this category.")
bgneal@75 25
bgneal@75 26 class Meta:
bgneal@75 27 ordering = ('position', )
bgneal@75 28 verbose_name_plural = 'Categories'
bgneal@75 29
bgneal@75 30 def __unicode__(self):
bgneal@75 31 return self.name
bgneal@75 32
bgneal@100 33 def can_access(self, user):
bgneal@100 34 """
bgneal@100 35 Checks to see if the given user has permission to access
bgneal@100 36 this category.
bgneal@100 37 If this category has no groups assigned to it, return true.
bgneal@100 38 Else, return true if the user belongs to a group that has been
bgneal@100 39 assigned to this category, and false otherwise.
bgneal@100 40 """
bgneal@100 41 if self.groups.count() == 0:
bgneal@100 42 return True
bgneal@100 43 if user.is_authenticated():
bgneal@100 44 return self.groups.filter(user__pk=user.id).count() > 0
bgneal@100 45 return False
bgneal@100 46
bgneal@170 47 def is_public(self):
bgneal@170 48 """Returns true if this is a public category, viewable by all."""
bgneal@170 49 return self.groups.count() == 0
bgneal@170 50
bgneal@100 51
bgneal@100 52 class ForumManager(models.Manager):
bgneal@100 53 """
bgneal@100 54 The manager for the Forum model. Provides a centralized place to
bgneal@100 55 put commonly used and useful queries.
bgneal@100 56 """
bgneal@100 57
bgneal@100 58 def forums_for_user(self, user):
bgneal@100 59 """
bgneal@100 60 Returns a queryset containing the forums that the given user can
bgneal@100 61 "see" due to authenticated status, superuser status and group membership.
bgneal@100 62 """
bgneal@167 63 qs = self._for_user(user)
bgneal@167 64 return qs.select_related('category', 'last_post', 'last_post__user')
bgneal@167 65
bgneal@167 66 def forum_ids_for_user(self, user):
bgneal@167 67 """Returns a list of forum IDs that the given user can "see"."""
bgneal@167 68 qs = self._for_user(user)
bgneal@167 69 return qs.values_list('id', flat=True)
bgneal@167 70
bgneal@170 71 def public_forums(self):
bgneal@170 72 """Returns a queryset containing the public forums."""
bgneal@170 73 return self.filter(category__groups__isnull=True)
bgneal@170 74
bgneal@387 75 def public_forum_ids(self):
bgneal@387 76 """
bgneal@387 77 Returns a list of ids for the public forums; the list is cached for
bgneal@387 78 performance.
bgneal@387 79 """
bgneal@387 80 public_forums = cache.get('public_forum_ids')
bgneal@387 81 if public_forums is None:
bgneal@387 82 public_forums = list(self.filter(
bgneal@387 83 category__groups__isnull=True).values_list('id', flat=True))
bgneal@387 84 cache.set('public_forum_ids', public_forums, 3600)
bgneal@387 85 return public_forums
bgneal@387 86
bgneal@167 87 def _for_user(self, user):
bgneal@167 88 """Common code for the xxx_for_user() methods."""
bgneal@100 89 if user.is_superuser:
bgneal@100 90 qs = self.all()
bgneal@100 91 else:
bgneal@167 92 user_groups = user.groups.all() if user.is_authenticated() else []
bgneal@167 93 qs = self.filter(Q(category__groups__isnull=True) |
bgneal@100 94 Q(category__groups__in=user_groups))
bgneal@167 95 return qs
bgneal@100 96
bgneal@75 97
bgneal@75 98 class Forum(models.Model):
bgneal@100 99 """
bgneal@100 100 A forum is a collection of topics.
bgneal@100 101 """
bgneal@75 102 category = models.ForeignKey(Category, related_name='forums')
bgneal@75 103 name = models.CharField(max_length=80)
bgneal@75 104 slug = models.SlugField(max_length=80)
bgneal@75 105 description = models.TextField(blank=True, default='')
bgneal@75 106 position = models.IntegerField(blank=True, default=0)
bgneal@75 107 moderators = models.ManyToManyField(Group, blank=True, null=True)
bgneal@75 108
bgneal@75 109 # denormalized fields to reduce database hits
bgneal@75 110 topic_count = models.IntegerField(blank=True, default=0)
bgneal@75 111 post_count = models.IntegerField(blank=True, default=0)
bgneal@75 112 last_post = models.OneToOneField('Post', blank=True, null=True,
bgneal@75 113 related_name='parent_forum')
bgneal@75 114
bgneal@100 115 objects = ForumManager()
bgneal@100 116
bgneal@75 117 class Meta:
bgneal@75 118 ordering = ('position', )
bgneal@75 119
bgneal@75 120 def __unicode__(self):
bgneal@75 121 return self.name
bgneal@75 122
bgneal@81 123 @models.permalink
bgneal@81 124 def get_absolute_url(self):
bgneal@81 125 return ('forums-forum_index', [self.slug])
bgneal@81 126
bgneal@75 127 def topic_count_update(self):
bgneal@75 128 """Call to notify the forum that its topic count has been updated."""
bgneal@75 129 self.topic_count = Topic.objects.filter(forum=self).count()
bgneal@75 130
bgneal@75 131 def post_count_update(self):
bgneal@75 132 """Call to notify the forum that its post count has been updated."""
bgneal@75 133 my_posts = Post.objects.filter(topic__forum=self)
bgneal@75 134 self.post_count = my_posts.count()
bgneal@75 135 if self.post_count > 0:
bgneal@75 136 self.last_post = my_posts[self.post_count - 1]
bgneal@75 137 else:
bgneal@75 138 self.last_post = None
bgneal@75 139
bgneal@112 140 def sync(self):
bgneal@112 141 """
bgneal@112 142 Call to notify the forum that it needs to recompute its
bgneal@112 143 denormalized fields.
bgneal@112 144 """
bgneal@112 145 self.topic_count_update()
bgneal@112 146 self.post_count_update()
bgneal@112 147
bgneal@293 148 def last_post_pre_delete(self, deleting_topic=False):
bgneal@107 149 """
bgneal@107 150 Call this function prior to deleting the last post in the forum.
bgneal@107 151 A new last post will be found, if one exists.
bgneal@107 152 This is to avoid the Django cascading delete issue.
bgneal@293 153 If deleting_topic is True, then the whole topic the last post is
bgneal@293 154 part of is being deleted, so we can't pick a new last post from that
bgneal@293 155 topic.
bgneal@107 156 """
bgneal@107 157 try:
bgneal@293 158 qs = Post.objects.filter(topic__forum=self)
bgneal@293 159 if deleting_topic:
bgneal@293 160 qs = qs.exclude(topic=self.last_post.topic)
bgneal@293 161 else:
bgneal@293 162 qs = qs.exclude(pk=self.last_post.pk)
bgneal@293 163
bgneal@293 164 self.last_post = qs.latest()
bgneal@293 165
bgneal@107 166 except Post.DoesNotExist:
bgneal@107 167 self.last_post = None
bgneal@107 168
bgneal@113 169 def catchup(self, user, flv=None):
bgneal@113 170 """
bgneal@113 171 Call to mark this forum all caught up for the given user (i.e. mark all topics
bgneal@113 172 read for this user).
bgneal@113 173 """
bgneal@113 174 TopicLastVisit.objects.filter(user=user, topic__forum=self).delete()
bgneal@113 175 if flv is None:
bgneal@113 176 try:
bgneal@113 177 flv = ForumLastVisit.objects.get(user=user, forum=self)
bgneal@113 178 except ForumLastVisit.DoesNotExist:
bgneal@113 179 flv = ForumLastVisit(user=user, forum=self)
bgneal@113 180
bgneal@113 181 now = datetime.datetime.now()
bgneal@113 182 flv.begin_date = now
bgneal@113 183 flv.end_date = now
bgneal@113 184 flv.save()
bgneal@113 185
bgneal@75 186
bgneal@75 187 class Topic(models.Model):
bgneal@100 188 """
bgneal@100 189 A topic is a thread of discussion, consisting of a series of posts.
bgneal@100 190 """
bgneal@75 191 forum = models.ForeignKey(Forum, related_name='topics')
bgneal@75 192 name = models.CharField(max_length=255)
bgneal@75 193 creation_date = models.DateTimeField(auto_now_add=True)
bgneal@75 194 user = models.ForeignKey(User)
bgneal@75 195 view_count = models.IntegerField(blank=True, default=0)
bgneal@75 196 sticky = models.BooleanField(blank=True, default=False)
bgneal@75 197 locked = models.BooleanField(blank=True, default=False)
bgneal@181 198 subscribers = models.ManyToManyField(User, related_name='subscriptions',
bgneal@386 199 verbose_name='subscribers', blank=True)
bgneal@232 200 bookmarkers = models.ManyToManyField(User, related_name='favorite_topics',
bgneal@232 201 verbose_name='bookmarkers', blank=True)
bgneal@75 202
bgneal@75 203 # denormalized fields to reduce database hits
bgneal@75 204 post_count = models.IntegerField(blank=True, default=0)
bgneal@102 205 update_date = models.DateTimeField()
bgneal@75 206 last_post = models.OneToOneField('Post', blank=True, null=True,
bgneal@75 207 related_name='parent_topic')
bgneal@75 208
bgneal@75 209 class Meta:
bgneal@75 210 ordering = ('-sticky', '-update_date', )
bgneal@75 211
bgneal@75 212 def __unicode__(self):
bgneal@75 213 return self.name
bgneal@75 214
bgneal@82 215 @models.permalink
bgneal@82 216 def get_absolute_url(self):
bgneal@82 217 return ('forums-topic_index', [self.pk])
bgneal@82 218
bgneal@75 219 def post_count_update(self):
bgneal@75 220 """
bgneal@75 221 Call this function to notify the topic instance that its post count
bgneal@75 222 has changed.
bgneal@75 223 """
bgneal@75 224 my_posts = Post.objects.filter(topic=self)
bgneal@75 225 self.post_count = my_posts.count()
bgneal@75 226 if self.post_count > 0:
bgneal@75 227 self.last_post = my_posts[self.post_count - 1]
bgneal@75 228 self.update_date = self.last_post.creation_date
bgneal@75 229 else:
bgneal@75 230 self.last_post = None
bgneal@75 231 self.update_date = self.creation_date
bgneal@75 232
bgneal@83 233 def reply_count(self):
bgneal@83 234 """
bgneal@83 235 Returns the number of replies to a topic. The first post
bgneal@83 236 doesn't count as a reply.
bgneal@83 237 """
bgneal@83 238 if self.post_count > 1:
bgneal@83 239 return self.post_count - 1
bgneal@83 240 return 0
bgneal@83 241
bgneal@102 242 def save(self, *args, **kwargs):
bgneal@102 243 if not self.id:
bgneal@102 244 now = datetime.datetime.now()
bgneal@102 245 self.creation_date = now
bgneal@102 246 self.update_date = now
bgneal@102 247
bgneal@102 248 super(Topic, self).save(*args, **kwargs)
bgneal@102 249
bgneal@107 250 def last_post_pre_delete(self):
bgneal@107 251 """
bgneal@107 252 Call this function prior to deleting the last post in the topic.
bgneal@107 253 A new last post will be found, if one exists.
bgneal@107 254 This is to avoid the Django cascading delete issue.
bgneal@107 255 """
bgneal@107 256 try:
bgneal@107 257 self.last_post = \
bgneal@107 258 Post.objects.filter(topic=self).exclude(pk=self.last_post.pk).latest()
bgneal@107 259 except Post.DoesNotExist:
bgneal@107 260 self.last_post = None
bgneal@107 261
bgneal@75 262
bgneal@75 263 class Post(models.Model):
bgneal@100 264 """
bgneal@100 265 A post is an instance of a user's single contribution to a topic.
bgneal@100 266 """
bgneal@75 267 topic = models.ForeignKey(Topic, related_name='posts')
bgneal@75 268 user = models.ForeignKey(User, related_name='posts')
bgneal@277 269 creation_date = models.DateTimeField(db_index=True)
bgneal@277 270 update_date = models.DateTimeField(db_index=True)
bgneal@75 271 body = models.TextField()
bgneal@75 272 html = models.TextField()
bgneal@83 273 user_ip = models.IPAddressField(blank=True, default='', null=True)
bgneal@285 274 attachments = models.ManyToManyField(Oembed, through='Attachment')
bgneal@75 275
bgneal@75 276 class Meta:
bgneal@97 277 ordering = ('creation_date', )
bgneal@107 278 get_latest_by = 'creation_date'
bgneal@226 279 verbose_name = 'forum post'
bgneal@226 280 verbose_name_plural = 'forum posts'
bgneal@75 281
bgneal@91 282 @models.permalink
bgneal@91 283 def get_absolute_url(self):
bgneal@91 284 return ('forums-goto_post', [self.pk])
bgneal@91 285
bgneal@75 286 def summary(self):
bgneal@75 287 LIMIT = 50
bgneal@75 288 if len(self.body) < LIMIT:
bgneal@75 289 return self.body
bgneal@75 290 return self.body[:LIMIT] + '...'
bgneal@75 291
bgneal@75 292 def __unicode__(self):
bgneal@75 293 return self.summary()
bgneal@75 294
bgneal@75 295 def save(self, *args, **kwargs):
bgneal@277 296 if not self.id:
bgneal@277 297 self.creation_date = datetime.datetime.now()
bgneal@277 298 self.update_date = self.creation_date
bgneal@277 299
bgneal@128 300 self.html = site_markup(self.body)
bgneal@75 301 super(Post, self).save(*args, **kwargs)
bgneal@75 302
bgneal@75 303 def delete(self, *args, **kwargs):
bgneal@75 304 first_post_id = self.topic.posts.all()[0].id
bgneal@75 305 super(Post, self).delete(*args, **kwargs)
bgneal@75 306 if self.id == first_post_id:
bgneal@75 307 self.topic.delete()
bgneal@75 308
bgneal@113 309 def has_been_edited(self):
bgneal@277 310 return self.update_date > self.creation_date
bgneal@115 311
bgneal@115 312 def touch(self):
bgneal@115 313 """Call this function to indicate the post has been edited."""
bgneal@115 314 self.update_date = datetime.datetime.now()
bgneal@113 315
bgneal@222 316 def search_title(self):
bgneal@222 317 return u"%s by %s" % (self.topic.name, self.user.username)
bgneal@222 318
bgneal@222 319 def search_summary(self):
bgneal@222 320 return self.body
bgneal@222 321
bgneal@98 322
bgneal@98 323 class FlaggedPost(models.Model):
bgneal@98 324 """This model represents a user flagging a post as inappropriate."""
bgneal@98 325 user = models.ForeignKey(User)
bgneal@98 326 post = models.ForeignKey(Post)
bgneal@98 327 flag_date = models.DateTimeField(auto_now_add=True)
bgneal@98 328
bgneal@98 329 def __unicode__(self):
bgneal@98 330 return u'Post ID %s flagged by %s' % (self.post.id, self.user.username)
bgneal@98 331
bgneal@98 332 class Meta:
bgneal@98 333 ordering = ('flag_date', )
bgneal@98 334
bgneal@98 335 def get_post_url(self):
bgneal@98 336 return '<a href="%s">Post</a>' % self.post.get_absolute_url()
bgneal@98 337 get_post_url.allow_tags = True
bgneal@98 338
bgneal@113 339
bgneal@113 340 class ForumLastVisit(models.Model):
bgneal@113 341 """
bgneal@113 342 This model records the last time a user visited a forum.
bgneal@113 343 It is used to compute if a user has unread topics in a forum.
bgneal@113 344 We keep track of a window of time, delimited by begin_date and end_date.
bgneal@113 345 Topics updated within this window are tracked, and may have TopicLastVisit
bgneal@113 346 objects.
bgneal@113 347 Marking a forum as all read sets the begin_date equal to the end_date.
bgneal@113 348 """
bgneal@113 349 user = models.ForeignKey(User)
bgneal@113 350 forum = models.ForeignKey(Forum)
bgneal@113 351 begin_date = models.DateTimeField()
bgneal@113 352 end_date = models.DateTimeField()
bgneal@113 353
bgneal@113 354 class Meta:
bgneal@113 355 unique_together = ('user', 'forum')
bgneal@113 356 ordering = ('-end_date', )
bgneal@113 357
bgneal@113 358 def __unicode__(self):
bgneal@113 359 return u'Forum: %d User: %d Date: %s' % (self.forum.id, self.user.id,
bgneal@113 360 self.end_date.strftime('%Y-%m-%d %H:%M:%S'))
bgneal@113 361
bgneal@113 362 def is_caught_up(self):
bgneal@113 363 return self.begin_date == self.end_date
bgneal@113 364
bgneal@113 365
bgneal@113 366 class TopicLastVisit(models.Model):
bgneal@113 367 """
bgneal@113 368 This model records the last time a user read a topic.
bgneal@113 369 Objects of this class exist for the window specified in the
bgneal@113 370 corresponding ForumLastVisit object.
bgneal@113 371 """
bgneal@113 372 user = models.ForeignKey(User)
bgneal@113 373 topic = models.ForeignKey(Topic)
bgneal@113 374 last_visit = models.DateTimeField()
bgneal@113 375
bgneal@113 376 class Meta:
bgneal@113 377 unique_together = ('user', 'topic')
bgneal@113 378 ordering = ('-last_visit', )
bgneal@113 379
bgneal@113 380 def __unicode__(self):
bgneal@113 381 return u'Topic: %d User: %d Date: %s' % (self.topic.id, self.user.id,
bgneal@113 382 self.last_visit.strftime('%Y-%m-%d %H:%M:%S'))
bgneal@113 383
bgneal@113 384 def save(self, *args, **kwargs):
bgneal@116 385 if self.id is None:
bgneal@113 386 self.touch()
bgneal@113 387 super(TopicLastVisit, self).save(*args, **kwargs)
bgneal@293 388
bgneal@113 389 def touch(self):
bgneal@113 390 self.last_visit = datetime.datetime.now()
bgneal@164 391
bgneal@285 392
bgneal@285 393 class Attachment(models.Model):
bgneal@285 394 """
bgneal@285 395 This model is a "through" table for the M2M relationship between forum
bgneal@285 396 posts and Oembed objects.
bgneal@285 397 """
bgneal@285 398 post = models.ForeignKey(Post)
bgneal@285 399 embed = models.ForeignKey(Oembed)
bgneal@285 400 order = models.IntegerField()
bgneal@285 401
bgneal@285 402 class Meta:
bgneal@285 403 ordering = ('order', )
bgneal@285 404
bgneal@285 405 def __unicode__(self):
bgneal@285 406 return u'Post %d, %s' % (self.post.pk, self.embed.title)
bgneal@301 407