Optimize qs

cms/utils/page.py

@@ -95,10 +95,13 @@ def get_page_from_request(request, use_path=None, clean_path=None):
         .get_for_site(site)
         .filter(path=path)
         .select_related('page__node')
-        .prefetch_related('page__pagecontent_set')
     )
-    page = getattr(page_urls.first(), "page", None)
-    if page is not None:
+    page_urls = list(page_urls)  # force queryset evaluation to save 1 query
+    try:
+        page = page_urls[0].page
+    except IndexError:
+        page = None
+    else:
         page.urls_cache = {url.language: url for url in page_urls}
     return page
 

cms/views.py

@@ -140,12 +140,10 @@ def details(request, slug):
         # this means we need to correctly redirect that request.
         return _handle_no_page(request)
 
-    # pagecontent_languages will return all languages available to the public
-    # get_page_from_request has prefetched all public pagecontent_set objects
+    # we use the _get_page_content_cache method to populate the cache with all public languages
     # The languages are then filtered out by the user allowed languages
-    pagecontent_languages = [
-        pagecontent.language for pagecontent in page.pagecontent_set.all()
-    ]
+    page._get_page_content_cache(None, fallback=True, force_reload=True)
+    pagecontent_languages = list(page.page_content_cache.keys())
     available_languages = [
         language for language in user_languages
         if language in pagecontent_languages