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1 """This file contains the feed class for the forums application."""
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2
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3 from django.contrib.syndication.views import Feed
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4 from django.core.exceptions import ObjectDoesNotExist
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5 from django.shortcuts import get_object_or_404
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6
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7 from forums.models import Forum, Topic, Post
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8 from core.functions import copyright_str
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9
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10
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11 class ForumsFeed(Feed):
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12 """The Feed class for a specific forum"""
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13
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14 ttl = '60'
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15 author_name = 'Brian Neal'
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16 author_email = 'admin@surfguitar101.com'
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17
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18 def get_object(self, request, forum_slug):
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19 # only return public forums
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20 if forum_slug:
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21 forum = get_object_or_404(Forum, slug=forum_slug)
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22 if forum.id not in Forum.objects.public_forum_ids():
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23 raise ObjectDoesNotExist
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24 return forum
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25
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26 else:
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27 # return None to indicate we want a combined feed
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28 return None
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29
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30 def title(self, obj):
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31 if obj is None:
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32 forum_name = 'Combined'
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33 else:
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34 forum_name = obj.name
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35
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36 return 'SurfGuitar101.com %s Forum Feed' % forum_name
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37
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38 def link(self, obj):
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39 if obj is None:
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40 bits = ''
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41 else:
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42 bits = obj.slug + '/'
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43
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44 return '/feeds/forums/' + bits
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45
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46 def description(self, obj):
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47 if obj is None:
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48 return "User posts to SurfGuitar101.com forums."
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49 return obj.description
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50
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51 def feed_copyright(self):
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52 return copyright_str()
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53
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54 def items(self, obj):
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55 if obj is None:
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56 # return a combined feed of public forum threads
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57
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58 # This was tricky to do without suffering a large performance
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59 # impact. Because the number of forums is small, MySQL did not
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60 # try to use an index and ended up searching all the topics for
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61 # candidate posts. We work around this by first getting a small list
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62 # of candidate topics, and then searching them. This is more
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63 # queries but a *lot* more time efficient.
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64
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65 forum_ids = Forum.objects.public_forum_ids()
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66 topic_ids = list(Topic.objects.filter(forum__in=forum_ids).order_by(
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67 '-update_date').values_list('id', flat=True)[:30])
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68 items = Post.objects.filter(topic__in=topic_ids)
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69
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70 else:
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71 items = Post.objects.filter(topic__forum=obj)
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72
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73 return items.order_by('-creation_date').select_related('topic', 'user',
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74 'topic__forum')[:30]
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75
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76 def item_title(self, item):
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77 return item.topic.name
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78
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79 def item_description(self, item):
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80 return item.html
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81
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82 def item_author_name(self, item):
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83 return item.user.username
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84
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85 def item_pubdate(self, item):
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86 return item.creation_date
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87
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88 def item_categories(self, item):
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89 return (item.topic.forum.name, )
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