Pagination (fix #313, rip performances)

templates/tutorialv2/includes/article_pager.part.html

@@ -0,0 +1,21 @@
+{%  if paginate_articles %}
+
+    <ul class="pagination pagination-{{ position }} pagination-chapter">
+        {% if previous_article %}
+            <li class="prev">
+                <a href="{{ previous_article.get_absolute_url_online }}" class="ico-after arrow-left">
+                    {{ previous_article.content.title }}
+                </a>
+            </li>
+        {% endif %}
+
+        {% if next_article %}
+            <li class="next">
+                <a href="{{ next_article.get_absolute_url_online }}" class="ico-after arrow-right" >
+                    {{ next_article.content.title }}
+                </a>
+            </li>
+        {% endif %}
+    </ul>
+
+{% endif %}

templates/tutorialv2/view/content_online.html

@@ -90,6 +90,8 @@ <h2 class="subtitle" itemprop="description">
 
     {% endif %}
 
+    {% include "tutorialv2/includes/article_pager.part.html" with content=content %}
+
     {% include "tutorialv2/includes/warn_typo.part.html" with content=content %}
 
 {% endblock %}

zds/tutorialv2/views/views_published.py

@@ -77,7 +77,30 @@ def get_context_data(self, **kwargs):
             .filter(related_content=self.object)\
             .order_by("pubdate")
 
-        # pagination:
+        # pagination of articles
+        context['paginate_articles'] = False
+
+        if self.object.type == 'ARTICLE':
+            # fetch all articles in order to find the previous and the next one
+            all_articles = \
+                [a for a in PublishedContent.objects.filter(content_type="ARTICLE", must_redirect=False).all()]
+            articles_count = len(all_articles)
+
+            try:
+                position = all_articles.index(self.public_content_object)
+            except ValueError:
+                pass  # for an unknown reason, the article is not in the list. This should not happen
+            else:
+                context['paginate_articles'] = True
+                context['previous_article'] = None
+                context['next_article'] = None
+
+                if position > 0:
+                    context['previous_article'] = all_articles[position - 1]
+                if position < articles_count - 1:
+                    context['next_article'] = all_articles[position + 1]
+
+        # pagination of comments
         make_pagination(context,
                         self.request,
                         queryset_reactions,