Refactor case navigation: consolidate previous and next links into a reusable partial for improved maintainability and consistency across templates

atlas/views.py

@@ -2763,6 +2763,7 @@ def collection_case_priors(request, exam_id, case_id):
     if request.htmx:
         # Ensure we can render the updated single-card partial and return it so HTMX
         # can swap the card on the client side.
+
         if "remove" in request.POST:
             prior_pk = request.POST["remove"]
             try:
@@ -2792,10 +2793,27 @@ def collection_case_priors(request, exam_id, case_id):
             return HttpResponse(html)
         elif "prior_case_id" in request.POST:
             if not request.POST.get("relation"):
-                return HttpResponse(
-                    "You need to enter text to describe the relationship between the cases",
-                    status=400,
+                # Return the card partial with an inline error so HTMX will replace
+                # the card and display the validation message rather than navigating
+                # to a new page or showing a plain text response.
+                prior_case = Case.objects.get(pk=request.POST.get("prior_case_id"))
+                added = False
+                relation = request.POST.get("relation", "")
+                visibility = request.POST.get("prior_visibility", "AL")
+                html = render_to_string(
+                    "atlas/partials/_prior_card.html",
+                    {
+                        "case": prior_case,
+                        "added": added,
+                        "relation": relation,
+                        "visibility": visibility,
+                        "case_detail": case_detail,
+                        "collection": collection,
+                        "error": "You need to enter text to describe the relationship between the cases",
+                    },
+                    request=request,
                 )
+                return HttpResponse(html)
             prior_case = Case.objects.get(pk=request.POST["prior_case_id"])
             p, created = CasePrior.objects.get_or_create(
                 case_detail=case_detail, prior_case=prior_case
@@ -3576,8 +3594,8 @@ def collection_case_view(request, pk, case_number):
 
     series_list = case.series.all().prefetch_related("images", "examination", "plane")
 
-    previous = case_number > 0
-    next = case_number < (case_count - 1)
+    previous = collection.get_previous_case(casedetail.case)
+    next = collection.get_next_case(casedetail.case)
 
     return render(
         request,