Add proper enum for inventory batch "count mode" filter

tailbone/views/inventory.py

@@ -41,7 +41,7 @@ import colander
 import formencode as fe
 from webhelpers2.html import HTML, tags
 
-from tailbone import forms
+from tailbone import forms, grids
 from tailbone.views import MasterView3 as MasterView
 from tailbone.views.batch import BatchMasterView3 as BatchMasterView
 
@@ -136,10 +136,16 @@ class InventoryBatchView(BatchMasterView):
 
     def configure_grid(self, g):
         super(InventoryBatchView, self).configure_grid(g)
+
+        # mode
         g.set_enum('mode', self.enum.INVENTORY_MODE)
-        g.set_type('total_cost', 'currency')
+        g.filters['mode'].set_value_renderer(
+            grids.filters.EnumValueRenderer(self.enum.INVENTORY_MODE))
         g.set_label('mode', "Count Mode")
 
+        # total_cost
+        g.set_type('total_cost', 'currency')
+
     def render_mobile_listitem(self, batch, i):
         return "({}) {} rows - {}, {}".format(
             batch.id_str,