import datetime from utils import log as logging from django.db import models from django.contrib.auth.models import User from django.core.cache import cache from apps.rss_feeds.models import Feed, Story from apps.analyzer.models import ClassifierFeed, ClassifierAuthor, ClassifierTag, ClassifierTitle from apps.analyzer.models import apply_classifier_titles, apply_classifier_feeds, apply_classifier_authors, apply_classifier_tags from utils.compressed_textfield import StoryField DAYS_OF_UNREAD = 14 class UserSubscription(models.Model): """ A feed which a user has subscrubed to. Carries all of the cached information about the subscription, including unread counts of the three primary scores. Also has a dirty flag (needs_unread_recalc) which means that the unread counts are not accurate and need to be calculated with `self.calculate_feed_scores()`. """ user = models.ForeignKey(User) feed = models.ForeignKey(Feed) last_read_date = models.DateTimeField(default=datetime.datetime.now() - datetime.timedelta(days=DAYS_OF_UNREAD)) mark_read_date = models.DateTimeField(default=datetime.datetime.now() - datetime.timedelta(days=DAYS_OF_UNREAD)) unread_count_neutral = models.IntegerField(default=0) unread_count_positive = models.IntegerField(default=0) unread_count_negative = models.IntegerField(default=0) unread_count_updated = models.DateTimeField(default=datetime.datetime(2000,1,1)) needs_unread_recalc = models.BooleanField(default=False) feed_opens = models.IntegerField(default=0) is_trained = models.BooleanField(default=False) def __unicode__(self): return '[' + self.feed.feed_title + '] ' def save(self, force_insert=False, force_update=False, *args, **kwargs): self.unread_count_updated = datetime.datetime.now() super(UserSubscription, self).save(force_insert, force_update, *args, **kwargs) def mark_feed_read(self): now = datetime.datetime.now() if self.feed.stories.all(): latest_story_date = self.feed.stories.order_by('-story_date')[0].story_date\ + datetime.timedelta(minutes=1) else: latest_story_date = now self.last_read_date = max(now, latest_story_date) self.mark_read_date = max(now, latest_story_date) self.unread_count_negative = 0 self.unread_count_positive = 0 self.unread_count_neutral = 0 self.unread_count_updated = max(now, latest_story_date) self.needs_unread_relcalc = False self.save() def calculate_feed_scores(self, silent=False): if not self.feed.fetched_once: if not silent: logging.info(' ---> [%s]: NOT Computing scores: %s' % (self.user, self.feed)) self.needs_unread_recalc = False self.save() return if not silent: logging.info(' ---> [%s]: Computing scores: %s' % (self.user, self.feed)) feed_scores = dict(negative=0, neutral=0, positive=0) # Two weeks in age. If mark_read_date is older, mark old stories as read. date_delta = datetime.datetime.now()-datetime.timedelta(days=DAYS_OF_UNREAD) if date_delta < self.mark_read_date: date_delta = self.mark_read_date else: self.mark_read_date = date_delta read_stories = UserStory.objects.filter(user=self.user, feed=self.feed, story__story_date__gte=date_delta) read_stories_ids = [rs.story.id for rs in read_stories] from django.db import connection connection.queries = [] stories_db = Story.objects.filter(story_feed=self.feed, story_date__gte=date_delta)\ .exclude(id__in=read_stories_ids) stories = self.feed.format_stories(stories_db) classifier_feeds = ClassifierFeed.objects.filter(user=self.user, feed=self.feed) classifier_authors = ClassifierAuthor.objects.filter(user=self.user, feed=self.feed) classifier_titles = ClassifierTitle.objects.filter(user=self.user, feed=self.feed) classifier_tags = ClassifierTag.objects.filter(user=self.user, feed=self.feed) scores = { 'feed': apply_classifier_feeds(classifier_feeds, self.feed), } for story in stories: scores.update({ 'author': apply_classifier_authors(classifier_authors, story), 'tags': apply_classifier_tags(classifier_tags, story), 'title': apply_classifier_titles(classifier_titles, story), }) max_score = max(scores['feed'], scores['author'], scores['tags'], scores['title']) min_score = min(scores['feed'], scores['author'], scores['tags'], scores['title']) if max_score > 0: feed_scores['positive'] += 1 if min_score < 0: feed_scores['negative'] += 1 if max_score == 0 and min_score == 0: feed_scores['neutral'] += 1 self.unread_count_positive = feed_scores['positive'] self.unread_count_neutral = feed_scores['neutral'] self.unread_count_negative = feed_scores['negative'] self.needs_unread_recalc = False self.save() if (self.unread_count_positive == 0 and self.unread_count_neutral == 0): self.mark_feed_read() cache.delete('usersub:%s' % self.user.id) return class Meta: unique_together = ("user", "feed") class UserStory(models.Model): """ Stories read by the user. These are deleted as the mark_read_date for the UserSubscription passes the UserStory date. """ user = models.ForeignKey(User) feed = models.ForeignKey(Feed) story = models.ForeignKey(Story) read_date = models.DateTimeField(auto_now=True) opinion = models.IntegerField(default=0) def __unicode__(self): return ('[' + self.feed.feed_title + '] ' + self.story.story_title) class Meta: verbose_name_plural = "user stories" verbose_name = "user story" unique_together = ("user", "feed", "story") class UserSubscriptionFolders(models.Model): """ A JSON list of folders and feeds for while a user has subscribed. The list is a recursive descent of feeds and folders in folders. Used to layout the feeds and folders in the Reader's feed navigation pane. """ user = models.ForeignKey(User) folders = models.TextField(default="[]") def __unicode__(self): return "[%s]: %s" % (self.user, len(self.folders),) class Meta: verbose_name_plural = "folders" verbose_name = "folder" class Feature(models.Model): """ Simple blog-like feature board shown to all users on the home page. """ description = models.TextField(default="") date = models.DateTimeField(default=datetime.datetime.now) def __unicode__(self): return "[%s] %s" % (self.date, self.description[:50]) class Meta: ordering = ["-date"]