feat(projects): add check for finding next relevant page

Signed-off-by: David Wallace <[email protected]>

rdmo/projects/viewsets.py

@@ -522,27 +522,51 @@ def dispatch(self, *args, **kwargs):
     def retrieve(self, request, *args, **kwargs):
         page = self.get_object()
         conditions = page.conditions.select_related('source', 'target_option')
-
         values = self.project.values.filter(snapshot=None).select_related('attribute', 'option')
 
+        # Check if the current page meets conditions
         if check_conditions(conditions, values):
             serializer = self.get_serializer(page)
             return Response(serializer.data)
         else:
-            if request.GET.get('back') == 'true':
-                prev_page = self.project.catalog.get_prev_page(page)
-                if prev_page is not None:
-                    url = reverse('v1-projects:project-page-detail',
-                                  args=[self.project.id, prev_page.id]) + '?back=true'
-                    return HttpResponseRedirect(url, status=303)
+            # Determine the direction of navigation (back or forward)
+            direction = 'prev' if request.GET.get('back') == 'true' else 'next'
+            next_page = self._find_next_relevant_page(page, direction)
+
+            if next_page:
+                url = reverse('v1-projects:project-page-detail', args=[self.project.id, next_page.id])
+                if direction == 'prev':
+                    url += '?back=true'
+                return HttpResponseRedirect(url, status=303)
+
+            # If no next relevant page is found, end of catalog
+            return Response(status=204)
+
+    def _find_next_relevant_page(self, page, direction):
+        """
+        Helper method to find the next page that meets conditions.
+        :param page: current page object
+        :param direction: 'next' or 'prev' direction for navigation
+        :return: next relevant page or None if no further page meets conditions
+        """
+        while True:
+            if direction == 'prev':
+                next_page = self.project.catalog.get_prev_page(page)
             else:
                 next_page = self.project.catalog.get_next_page(page)
-                if next_page is not None:
-                    url = reverse('v1-projects:project-page-detail', args=[self.project.id, next_page.id])
-                    return HttpResponseRedirect(url, status=303)
 
-            # indicate end of catalog
-            return Response(status=204)
+            # Break the loop if no more pages are available
+            if not next_page:
+                return None
+
+            # Check if the next page meets conditions
+            conditions = next_page.conditions.select_related('source', 'target_option')
+            values = self.project.values.filter(snapshot=None).select_related('attribute', 'option')
+            if check_conditions(conditions, values):
+                return next_page  # Found the final target page
+
+            # Move to the next page in the loop
+            page = next_page
 
     @action(detail=False, url_path='continue', permission_classes=(HasModelPermission | HasProjectPagePermission, ))
     def get_continue(self, request, pk=None, parent_lookup_project=None):