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1 """
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2 This module contains misc. utility functions for forum management.
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3 """
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4 from forums.models import Post, Topic, Forum, ForumLastVisit, TopicLastVisit
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5
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6
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7 def delete_user_posts(user):
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8 """
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9 This function deletes all the posts for a given user.
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10 It also cleans up any last visit database records for the user.
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11 This function adjusts the last post foreign keys before deleting
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12 the posts to avoid the cascading delete behavior.
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13 """
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14 posts = Post.objects.filter(user=user).select_related()
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15
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16 # build a set of topics and forums affected by the post deletions
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17
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18 topics = set(post.topic for post in posts)
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19 forums = set(topic.forum for topic in topics)
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20
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21 post_ids = [post.pk for post in posts]
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22 pending_delete = []
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23
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24 for topic in topics:
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25 if topic.last_post.pk in post_ids:
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26 topic_posts = Post.objects.filter(topic=topic).exclude(
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27 pk__in=post_ids)
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28 topic.post_count = topic_posts.count()
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29 if topic.post_count > 0:
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30 topic.last_post = topic_posts.latest()
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31 topic.update_date = topic.last_post.creation_date
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32 topic.save()
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33 else:
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34 # Topic should be deleted, it has no posts;
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35 # We can't delete it now as it could cascade and take out a
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36 # forum. Remember it for later deletion.
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37 pending_delete.append(topic)
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38
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39 for forum in forums:
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40 if forum.last_post.pk in post_ids:
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41 forum_posts = Post.objects.filter(topic__forum=forum).exclude(
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42 pk__in=post_ids)
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43 forum.post_count = forum_posts.count()
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44 if forum.post_count > 0:
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45 forum.last_post = forum_posts.latest()
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46 else:
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47 forum.last_post = None
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48 forum.save()
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49
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50 # Delete pending topics now because forums have just adjusted their
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51 # foreign keys into Post
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52 if pending_delete:
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53 topic_ids = [topic.pk for topic in pending_delete]
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54 Topic.objects.filter(pk__in=topic_ids).delete()
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55
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56 # Topics have been deleted, re-compute topic counts for forums
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57 for forum in forums:
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58 forum.topic_count = Topic.objects.filter(forum=forum).count()
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59 forum.save()
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60
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61 # All foreign keys are accounted for, we can now delete the posts in bulk.
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62 # Since some posts in our original queryset may have been deleted already,
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63 # run a new query (although it may be ok)
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64 Post.objects.filter(pk__in=post_ids).delete()
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65
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66 # delete all the last visit records for this user
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67 TopicLastVisit.objects.filter(user=user).delete()
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68 ForumLastVisit.objects.filter(user=user).delete()
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69
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