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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 import logging
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5
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6 from forums.models import Post, Topic, Forum, ForumLastVisit, TopicLastVisit
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7
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8
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9 def delete_user_posts(user):
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10 """
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11 This function deletes all the posts for a given user.
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12 It also cleans up any last visit database records for the user.
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13 This function adjusts the last post foreign keys before deleting
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14 the posts to avoid the cascading delete behavior.
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15 """
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16 posts = Post.objects.filter(user=user).select_related()
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17
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18 # build a set of topics and forums affected by the post deletions
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19
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20 topics = set(post.topic for post in posts)
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21 forums = set(topic.forum for topic in topics)
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22
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23 post_ids = [post.pk for post in posts]
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24 pending_delete = []
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25
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26 for topic in topics:
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27 if topic.last_post.pk in post_ids:
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28 topic_posts = Post.objects.filter(topic=topic).exclude(
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29 pk__in=post_ids)
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30 topic.post_count = topic_posts.count()
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31 if topic.post_count > 0:
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32 topic.last_post = topic_posts.latest()
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33 topic.update_date = topic.last_post.creation_date
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34 topic.save()
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35 else:
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36 # Topic should be deleted, it has no posts;
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37 # We can't delete it now as it could cascade and take out a
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38 # forum. Remember it for later deletion.
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39 pending_delete.append(topic)
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40
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41 for forum in forums:
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42 if forum.last_post.pk in post_ids:
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43 forum_posts = Post.objects.filter(topic__forum=forum).exclude(
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44 pk__in=post_ids)
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45 forum.post_count = forum_posts.count()
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46 if forum.post_count > 0:
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47 forum.last_post = forum_posts.latest()
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48 else:
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49 forum.last_post = None
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50 forum.save()
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51
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52 # Delete pending topics now because forums have just adjusted their
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53 # foreign keys into Post
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54 if pending_delete:
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55 topic_ids = [topic.pk for topic in pending_delete]
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56 Topic.objects.filter(pk__in=topic_ids).delete()
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57
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58 # Topics have been deleted, re-compute topic counts for forums
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59 for forum in forums:
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60 forum.topic_count = Topic.objects.filter(forum=forum).count()
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61 forum.save()
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62
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63 # All foreign keys are accounted for, we can now delete the posts in bulk.
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64 # Since some posts in our original queryset may have been deleted already,
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65 # run a new query (although it may be ok)
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66 Post.objects.filter(pk__in=post_ids).delete()
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67
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68 # delete all the last visit records for this user
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69 TopicLastVisit.objects.filter(user=user).delete()
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70 ForumLastVisit.objects.filter(user=user).delete()
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71
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72
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73 def create_topic(forum_slug, user, topic_name, post_body, ip='', sticky=False,
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74 locked=False):
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75 """Programmatically create a topic & first post in a given forum.
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76
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77 This function creates a new topic in the forum that has the slug
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78 specified by the 'forum_slug' argument. Other arguments are as follows:
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79 'user' - create the topic and post with this user as the owner
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80 'topic_name' - topic name (title)
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81 'post_body' - topic post body (as markup, not HTML)
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82 'ip' - IP address for the post (as a string)
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83 'sticky' - if True, the post will be stickied
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84 'locked' - if True, the post will be locked
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85
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86 """
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87 try:
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88 forum = Forum.objects.get(slug=forum_slug)
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89 except Forum.DoesNotExist:
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90 logging.error('could not create_topic for forum_slug=%s' % forum_slug)
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91 raise
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92
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93 topic = Topic(forum=forum,
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94 name=topic_name,
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95 user=user,
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96 sticky=sticky,
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97 locked=locked)
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98 topic.save()
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99
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100 post = Post(topic=topic,
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101 user=user,
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102 body=post_body,
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103 user_ip=ip)
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104 post.save()
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