Small changes to queries

boards/models/post.py

@@ -136,11 +136,6 b' class PostManager(models.Manager):'
 
             return thread
 
-    def exists(self, post_id):
-        posts = self.filter(id=post_id)
-
-        return posts.count() > 0
-
     def get_thread_page_count(self, tag=None):
         if tag:
             threads = self.filter(thread=None, tags=tag)

boards/models/user.py

@@ -56,7 +56,7 b' class User(models.Model):'
         tags = self.fav_tags.annotate(Count('threads')) \
             .filter(threads__count__gt=0).order_by('name')
 
-        if tags:
+        if tags.exists():
             cache.set(cache_key, tags, settings.CACHE_TIMEOUT)
 
         return tags