Use cache for PPD value

boards/models/post.py

@@ -5,6 +5,7 b' from random import random'
 import time
 import math
 import re
+from django.core.cache import cache
 
 from django.db import models
 from django.http import Http404
@@ -14,6 +15,10 b' from markupfield.fields import MarkupFie'
 from neboard import settings
 from boards import thumbs
 
+APP_LABEL_BOARDS = 'boards'
+
+CACHE_KEY_PPD = 'ppd'
+
 POSTS_PER_DAY_RANGE = range(7)
 
 BAN_REASON_AUTO = 'Auto'
@@ -40,6 +45,8 b' class PostManager(models.Manager):'
 
     def create_post(self, title, text, image=None, thread=None,
                     ip=NO_IP, tags=None, user=None):
+        cache.delete(CACHE_KEY_PPD)
+
         posting_time = timezone.now()
         if not thread:
             thread = Thread.objects.create(bump_time=posting_time,
@@ -157,6 +164,10 b' class PostManager(models.Manager):'
     def get_posts_per_day(self):
         """Get count of posts for the current day"""
 
+        ppd = cache.get(CACHE_KEY_PPD)
+        if ppd:
+            return ppd
+
         today = datetime.now().date()
 
         posts_per_days = []
@@ -166,11 +177,14 b' class PostManager(models.Manager):'
             day_time_start = datetime.combine(day_start, dtime())
             day_time_end = datetime.combine(day_end, dtime())
 
-            posts_per_days.append(float(self.filter(pub_time__lte=day_time_end,
-                           pub_time__gte=day_time_start).count()))
+            posts_per_days.append(float(self.filter(
+                pub_time__lte=day_time_end,
+                pub_time__gte=day_time_start).count()))
 
-        return sum(posts_per_day for posts_per_day in posts_per_days) / \
-               len(posts_per_days)
+        ppd = (sum(posts_per_day for posts_per_day in posts_per_days) /
+               len(posts_per_days))
+        cache.set(CACHE_KEY_PPD, ppd)
+        return ppd
 
 
 class Post(models.Model):
@@ -179,7 +193,7 b' class Post(models.Model):'
     objects = PostManager()
 
     class Meta:
-        app_label = 'boards'
+        app_label = APP_LABEL_BOARDS
 
     def _update_image_filename(self, filename):
         """Get unique image filename"""
@@ -241,7 +255,7 b' class Post(models.Model):'
 class Thread(models.Model):
 
     class Meta:
-        app_label = 'boards'
+        app_label = APP_LABEL_BOARDS
 
     tags = models.ManyToManyField('Tag')
     bump_time = models.DateTimeField()