Updated version to 1.3.2.

Updated status to stable/production.
Added AttributeError exception handling for models that specify a SortableForeignKey that does not inherit from Sortable.
Added template support for nested objects that are sortable by a foreign key, where the foreign key is not sortable.

adminsortable/__init__.py

@@ -1,4 +1,4 @@
-VERSION = (1, 3, 1)  # following PEP 386
+VERSION = (1, 3, 2)  # following PEP 386
 DEV_N = None
 
 

adminsortable/admin.py

@@ -59,7 +59,6 @@ class SortableAdmin(ModelAdmin):
         changed via drag-and-drop.
         """
         opts = self.model._meta
-        admin_site = self.admin_site
         has_perm = request.user.has_perm(opts.app_label + '.' + opts.get_change_permission())
         objects = self.model.objects.all()
 
@@ -87,7 +86,10 @@ class SortableAdmin(ModelAdmin):
             sortable_by_class_display_name = sortable_by_fk.rel.to._meta.verbose_name_plural
             sortable_by_class = sortable_by_fk.rel.to
             sortable_by_expression = sortable_by_fk.name.lower()
-            sortable_by_class_is_sortable = sortable_by_class.is_sortable()
+            try:
+                sortable_by_class_is_sortable = sortable_by_class.is_sortable()
+            except AttributeError:
+                sortable_by_class_is_sortable = False
 
         else:
             #model is not sortable by another model

adminsortable/templates/adminsortable/shared/list_items.html

@@ -1,6 +1,12 @@
 {% load adminsortable_tags %}
-{% for object in list_objects %}
-	<li>
-	    {% render_object_rep object %}
-	</li>
-{% endfor %}
+{% with list_objects_length=list_objects|length %}
+    {% for object in list_objects %}
+        <li>
+            {% if list_objects_length > 1 %}
+                {% render_object_rep object %}
+            {% else %}
+                {{ object }}
+            {% endif %}
+        </li>
+    {% endfor %}
+{% endwith %}

adminsortable/templates/adminsortable/shared/nested_objects.html

@@ -5,12 +5,18 @@
         {% for regrouped_object in regrouped_objects %}
             <li>
                 {% with object=regrouped_object.grouper %}
-                    {% render_object_rep object %}
+                    {% if sortable_by_class_is_sortable %}
+                        {% render_object_rep object %}
+                    {% else %}
+                        {{ object }}
+                    {% endif %}
                 {% endwith %}
                 {% if regrouped_object.list %}
-                    <ul {% if regrouped_object.grouper.is_sortable %}class="sortable"{% endif %}>
+                    {% with regrouped_object_list_length=regrouped_object.list|length %}
+                    <ul {% if regrouped_object_list_length > 1 %}class="sortable"{% endif %}>
                         {% render_list_items regrouped_object.list %}
                     </ul>
+                    {% endwith %}
                 {% endif %}
             </li>
         {% endfor %}