add option 'hidden'. You can hide news from newsfeed (e.g. about)

fet2020/posts/managers.py

@@ -7,6 +7,9 @@ class PostManager(models.Manager):
     def get_queryset(self):
         return super().get_queryset()
 
+    def get_visible_articles(self):
+        return self.get_queryset().filter(is_hidden=False)
+
 
 class ArticleManager(models.Manager):
     """
@@ -19,8 +22,11 @@ class ArticleManager(models.Manager):
             | Q(post_type='N')
         ).order_by('-public_date')
 
+    def get_visible_articles(self):
+        return self.get_queryset().filter(is_hidden=False)
+
     def get_pinned_article(self):
-        return self.get_queryset().filter(is_pinned=True)
+        return self.get_visible_articles().filter(is_pinned=True)
 
 
 class NewsManager(models.Manager):
@@ -30,6 +36,9 @@ class NewsManager(models.Manager):
     def get_queryset(self):
         return super().get_queryset().filter(post_type='N')
 
+    def get_visible_articles(self):
+        return self.get_queryset().filter(is_hidden=False)
+
 
 class AllEventManager(models.Manager):
     """