Update post ordering for categories

By (descending) publication and rule name

src/newsreader/js/pages/homepage/components/feedlist/filters.js

@@ -27,7 +27,11 @@ export const filterPostsByCategory = (category = {}, rules = [], posts = []) =>
     return filteredPosts.map(post => ({ ...post, rule: { ...rule } }));
   });
 
-  return filteredData.length > 0 ? [...filteredData.flat()] : [];
+  const sortedPosts = [...filteredData.flat()].sort((firstPost, secondPost) => {
+    return new Date(secondPost.publicationDate) - new Date(firstPost.publicationDate);
+  });
+
+  return sortedPosts;
 };
 
 export const filterPosts = state => {

src/newsreader/news/core/endpoints.py

@@ -92,7 +92,7 @@ class NestedPostCategoryView(ListAPIView):
 
         queryset = Post.objects.filter(
             rule__in=category.rules.values_list("id", flat=True)
-        ).order_by("rule", "-publication_date")
+        ).order_by("-publication_date", "rule__name")
 
         return queryset
 

src/newsreader/news/core/tests/endpoints/category/list/tests.py

@@ -498,13 +498,12 @@ class NestedCategoryPostView(TestCase):
         self.assertEquals(data["count"], 6)
 
         self.assertEquals(posts[0]["title"], "Second BBC post")
-        self.assertEquals(posts[1]["title"], "First BBC post")
-
+        self.assertEquals(posts[1]["title"], "Second Reuters post")
         self.assertEquals(posts[2]["title"], "Second Guardian post")
-        self.assertEquals(posts[3]["title"], "First Guardian post")
 
-        self.assertEquals(posts[4]["title"], "Second Reuters post")
-        self.assertEquals(posts[5]["title"], "First Reuters post")
+        self.assertEquals(posts[3]["title"], "First BBC post")
+        self.assertEquals(posts[4]["title"], "First Reuters post")
+        self.assertEquals(posts[5]["title"], "First Guardian post")
 
     def test_only_posts_from_category_are_returned(self):
         category = CategoryFactory.create(user=self.user)