Fewer db requests on home view.

- 1 request instead of (2 + #articles)

kfet/views.py

@@ -55,11 +55,21 @@ class Home(TemplateView):
     template_name = "kfet/home.html"
 
     def get_context_data(self, **kwargs):
-        context = super(TemplateView, self).get_context_data(**kwargs)
-        articles = Article.objects.all().filter(is_sold=True, hidden=False)
-        context['pressions'] = articles.filter(category__name='Pression')
-        context['articles'] = (articles.exclude(category__name='Pression')
-                               .order_by('category'))
+        context = super().get_context_data(**kwargs)
+        articles = list(
+            Article.objects
+            .filter(is_sold=True, hidden=False)
+            .select_related('category')
+            .order_by('category__name')
+        )
+        pressions, others = [], []
+        while len(articles) > 0:
+            article = articles.pop()
+            if article.category.name == 'Pression':
+                pressions.append(article)
+            else:
+                others.append(article)
+        context['pressions'], context['articles'] = pressions, others
         return context
 
     @method_decorator(login_required)