Sort shelves by shelfbook updated date

bookwyrm/templates/shelf.html

@@ -122,7 +122,7 @@
 
 <div class="block">
     <div>
-        {% include 'snippets/shelf.html' with shelf=shelf ratings=ratings %}
+        {% include 'snippets/shelf.html' with shelf=shelf books=books ratings=ratings %}
     </div>
 </div>
 {% endblock %}

bookwyrm/templates/snippets/shelf.html

@@ -1,6 +1,6 @@
 {% load humanize %}
 {% load bookwyrm_tags %}
-{% if shelf.books.all|length > 0 %}
+{% if books|length > 0 %}
 <table class="table is-striped is-fullwidth">
 
 <tr class="book-preview">
@@ -34,7 +34,7 @@
     </th>
     {% endif %}
 </tr>
-{% for book in shelf.books.all %}
+{% for book in books %}
 <tr class="book-preview">
     <td>
         {% include 'snippets/book_cover.html' with book=book size="small" %}

bookwyrm/views.py

@@ -765,12 +765,17 @@ def shelf_page(request, username, shelf_identifier):
     if is_api_request(request):
         return ActivitypubResponse(shelf.to_activity(**request.GET))
 
+    books = models.ShelfBook.objects.filter(
+        added_by=user, shelf=shelf
+    ).order_by('-updated_date').all()
+
     data = {
         'title': '%s\'s %s shelf' % (user.display_name, shelf.name),
         'user': user,
         'is_self': is_self,
         'shelves': shelves.all(),
         'shelf': shelf,
+        'books': [b.book for b in books],
     }
 
     return TemplateResponse(request, 'shelf.html', data)