Fix Sorting by ForeignKey

Removed do_inline_sorting_url and get_object_or_404 check in admin. The model_type_id should *always* be passed in.
Removed test that asserted that Categories weren't sortable as part of the Project admin. Categories *should* be sortable as part of Project admin as they are a Sortable ForeignKey.
Fixed object_rep template to pass in model_type_id again.
Updated README.
Version bump to 2.0.21

adminsortable/__init__.py

@@ -1,4 +1,4 @@
-VERSION = (2, 0, 20)
+VERSION = (2, 0, 21)
 DEV_N = None
 
 

adminsortable/admin.py

@@ -106,16 +106,10 @@ class SortableAdmin(SortableAdminBase, ModelAdmin):
             info = opts.app_label, opts.model_name
         except AttributeError:
             # Django < 1.7
-            info = opts.app_label, opts.modul_name
+            info = opts.app_label, opts.model_name
 
-        # this ajax view changes the order of instances of self.model
+        # this ajax view changes the order of instances of the model type
         admin_do_sorting_url = url(
-            r'^sort/do-sorting/$',
-            self.admin_site.admin_view(self.do_sorting_view),
-            name='%s_%s_do_sorting' % info)
-
-        # this ajax view changes the order of instances of inline models
-        admin_do_inline_sorting_url = url(
             r'^sort/do-sorting/(?P<model_type_id>\d+)/$',
             self.admin_site.admin_view(self.do_sorting_view),
             name='%s_%s_do_sorting' % info)
@@ -127,7 +121,6 @@ class SortableAdmin(SortableAdminBase, ModelAdmin):
             name='%s_%s_sort' % info)
 
         urls = [
-            admin_do_inline_sorting_url,
             admin_do_sorting_url,
             admin_sort_url
         ] + urls
@@ -280,15 +273,7 @@ class SortableAdmin(SortableAdminBase, ModelAdmin):
 
         if request.is_ajax():
             try:
-                if model_type_id is None:
-                    klass = self.model
-                else:
-                    klass = get_object_or_404(ContentType,
-                                              id=model_type_id).model_class()
-                    if klass not in (inline.model for inline in self.inlines):
-                        raise Http404(
-                            'There is no inline model with type id: {0}'.format(
-                                model_type_id))
+                klass = ContentType.objects.get(id=model_type_id).model_class()
 
                 indexes = list(map(str,
                     request.POST.get('indexes', []).split(',')))

adminsortable/templates/adminsortable/shared/object_rep.html

@@ -2,5 +2,5 @@
 
 <form>
     <input name="pk" type="hidden" value="{{ object.pk }}" />
-    <a href="{% url opts|admin_urlname:'do_sorting' %}" class="admin_sorting_url"><i class="fa fa-{% if forloop.first %}sort-desc{% elif forloop.last %}sort-asc{% else %}sort{% endif %}"></i> {{ object }}</a>
+    <a href="{% url opts|admin_urlname:'do_sorting' object.model_type_id %}" class="admin_sorting_url"><i class="fa fa-{% if forloop.first %}sort-desc{% elif forloop.last %}sort-asc{% else %}sort{% endif %}"></i> {{ object }}</a>
 </form>