dnscms: prefetch images and related objects that GraphQL listings resolve per item

dnscms/events/models.py

@@ -164,10 +164,16 @@ class EventOrganizerLink(Orderable):
         ]
 
 
+class EventOrganizerManager(WPAwareManager):
+    def get_queryset(self):
+        # GraphQL lists load these through here; saves a query per item
+        return super().get_queryset().prefetch_related("association")
+
+
 # registered as a snippet via EventOrganizerSnippetViewSet in wagtail_hooks.py
 @register_query_field("eventOrganizer", "eventOrganizers")
 class EventOrganizer(index.Indexed, ClusterableModel):
-    objects = WPAwareManager()
+    objects = EventOrganizerManager()
 
     name = models.CharField(
         max_length=100,
@@ -250,7 +256,9 @@ class EventPageManager(
     DeferWPFieldsManagerMixin,
     PageManager.from_queryset(EventPageQuerySet),
 ):
-    pass
+    def get_queryset(self):
+        # GraphQL lists load these through here; saves a query per item
+        return super().get_queryset().prefetch_related("featured_image")
 
 
 class EventPage(HeadlessMixin, WPImportedPageMixin, Page):
@@ -450,8 +458,14 @@ class EventPage(HeadlessMixin, WPImportedPageMixin, Page):
             self.price_member = ""
 
 
+class EventOccurrenceManager(WPAwareManager):
+    def get_queryset(self):
+        # GraphQL lists load these through here; saves a query per item
+        return super().get_queryset().prefetch_related("venue")
+
+
 class EventOccurrence(Orderable):
-    objects = WPAwareManager()
+    objects = EventOccurrenceManager()
 
     event = ParentalKey(EventPage, on_delete=models.CASCADE, related_name="occurrences")
     start = models.DateTimeField()