old_contents: from django.contrib.admin import StackedInline, TabularInline
  from django.template.defaultfilters import slugify
  
  class OrderableInlineMixin(object):
  
      class Media:
          js = (
              'js/jquery.browser.min.js',
              'js/orderable-inline-jquery-ui.js',
              'js/orderable-inline.js',
          )
          css = {
              'all': [
                  'css/orderable-inline.css'
              ]
          }
  
      def get_fieldsets(self, request, obj=None):
          if self.declared_fieldsets:
              return self.declared_fieldsets
          form = self.get_formset(request, obj, fields=None).form
          fields = list(form.base_fields) + list(self.get_readonly_fields(request, obj))
          return [
              (None, {
                  'fields': fields,
                  'classes': self.fieldset_css_classes + ['orderable-field-%s' % self.orderable_field]
              })
          ]
  
  class OrderableStackedInline(OrderableInlineMixin, StackedInline):
      fieldset_css_classes = ['orderable-stacked']
  
  class OrderableTabularInline(OrderableInlineMixin, TabularInline):
      fieldset_css_classes = ['orderable-tabular']
      template = 'orderable_inlines/edit_inline/tabular.html'
  
  
new_contents: from django.contrib.admin import StackedInline, TabularInline
  from django.template.defaultfilters import slugify
  
  class OrderableInlineMixin(object):
  
      class Media:
          js = (
              'js/jquery.browser.min.js',
              'js/orderable-inline-jquery-ui.js',
              'js/orderable-inline.js',
          )
          css = {
              'all': [
                  'css/orderable-inline.css'
              ]
          }
  
      def get_fieldsets(self, request, obj=None):
          form = self.get_formset(request, obj, fields=None).form
          fields = list(form.base_fields) + list(self.get_readonly_fields(request, obj))
          return [
              (None, {
                  'fields': fields,
                  'classes': self.fieldset_css_classes + ['orderable-field-%s' % self.orderable_field]
              })
          ]
  
  class OrderableStackedInline(OrderableInlineMixin, StackedInline):
      fieldset_css_classes = ['orderable-stacked']
  
  class OrderableTabularInline(OrderableInlineMixin, TabularInline):
      fieldset_css_classes = ['orderable-tabular']
      template = 'orderable_inlines/edit_inline/tabular.html'
  
  
subject: Make this hack compatible with Django 1.9