Mark the cache for change, so that we don't change it for no reason

app/cache.py

@@ -12,17 +12,29 @@ def create_timeline_cache():
     template = loader.get_template('objects/courses_timeline.html')
     timeline_html = template.render(RequestContext(HttpRequest(),context))
 
-    cache = HomeCache(cached_html=timeline_html)
+    cache = TimelineCache(cached_html=timeline_html)
     cache.save()
 
 def delete_timeline_cache():
-    old_cache = HomeCache.objects.earliest('create_time')
+    old_cache = TimelineCache.objects.earliest('create_time')
     old_cache.delete()
 
+def mark_timeline_cache():
+    cache = TimelineCache.objects.latest('create_time')
+    cache.should_change_mark = True
+    cache.save()
+
+def is_marked_timeline_cache():
+    cache = TimelineCache.objects.latest('create_time')
+    return cache.should_change_mark
+
 def get_timeline_context():
     context = {}
 
-    cache = HomeCache.objects.latest('create_time')
+    if not TimelineCache.objects.all().count():
+        create_timeline_cache()
+
+    cache = TimelineCache.objects.latest('create_time')
     timeline_html = cache.cached_html
     context["timeline"] = timeline_html
 

app/models.py

@@ -68,6 +68,7 @@ class Comment(models.Model):
     def __unicode__(self):
         return "Comm" + str(self.id)
 
-class HomeCache(models.Model):
-    cached_html = models.CharField(max_length=10000)
+class TimelineCache(models.Model):
+    cached_html = models.CharField(max_length=2000000)
+    should_change_mark = models.NullBooleanField()
     create_time = models.DateTimeField(auto_now=True)

app/views.py

@@ -72,6 +72,10 @@ def vote_course(request):
             rating.rating = rating_value
             rating.save()
 
+
+    if rating_type == OVERALL_R:
+        mark_timeline_cache()
+
     return redirect(form.cleaned_data['url'])
 
 

scripts/force_remake_cache.py

@@ -0,0 +1,4 @@
+from app.cache import *
+
+create_timeline_cache()
+delete_timeline_cache()

scripts/remake_cache.py

@@ -1,4 +1,8 @@
 from app.cache import *
 
-create_timeline_cache()
-delete_timeline_cache()
+if is_marked_timeline_cache():
+    create_timeline_cache()
+    delete_timeline_cache()
+
+
+# Its important to have two newlines after each script block