Caching PPD by day, removed manual cache removal

boards/models/post.py

@@ -43,26 +43,12 b" REGEX_REPLY = re.compile('>>(\\d+)')"
 
 class PostManager(models.Manager):
 
-    def clear_ppd_cache_if_old(self):
-        """
-        If new post in the other day then current post, a day has changed
-        and we need to remove the PPD cache and recalculate PPD including the
-        previous day
-        """
-
-        today = datetime.now().date()
-        posts = self.filter(pub_time__gte=today)
-        if posts.exists():
-            cache.delete(CACHE_KEY_PPD)
-
     def create_post(self, title, text, image=None, thread=None,
                     ip=NO_IP, tags=None, user=None):
         """
         Create new post
         """
 
-        self.clear_ppd_cache_if_old()
-
         posting_time = timezone.now()
         if not thread:
             thread = Thread.objects.create(bump_time=posting_time,
@@ -196,12 +182,11 b' class PostManager(models.Manager):'
         Get average count of posts per day for the last 7 days
         """
 
-        ppd = cache.get(CACHE_KEY_PPD)
+        today = datetime.now().date()
+        ppd = cache.get(CACHE_KEY_PPD + str(today))
         if ppd:
             return ppd
 
-        today = datetime.now().date()
-
         posts_per_days = []
         for i in POSTS_PER_DAY_RANGE:
             day_end = today - timedelta(i + 1)