django formset foo to get relation inline

gazetteer/places/admin.py

@@ -85,7 +85,7 @@ class FeatureRelationInline(admin.TabularInline):
     model = Feature.relationships.through
     extra = 1
     fk_name = 'feature1'
-
+    formset = RelationFormSet
 
 
 
@@ -93,7 +93,7 @@ class FeatureAdmin(admin.OSMGeoAdmin):
     fields = ('preferred_name', 'feature_type', 'admin1', 'admin2', 'geometry', 'url', 'authority_record', 'time_frame', 'is_primary',)
     search_fields = ['preferred_name']
 #    list_filter = ('feature_type',)
-    inlines = [FeatureNamesInline]
+    inlines = [FeatureNamesInline, FeatureRelationInline]
     list_display = ('__unicode__', 'feature_type_name', 'admin1', 'admin2', 'time_start', 'time_end',)
     list_per_page = 30
 #    list_filter = (FeatureTypeFilter,)

gazetteer/places/forms.py

@@ -0,0 +1,16 @@
+from django.forms.models import modelformset_factory
+from django.forms.models import BaseModelFormSet
+from ajax_select.fields import AutoCompleteSelectMultipleField, AutoCompleteSelectField
+
+from models import Relationship
+
+# create a superclass
+class BaseRelationsFormSet(BaseModelFormSet):
+
+    # that adds the field in, overwriting the previous default field
+    def add_fields(self, form, index):
+        super(BaseTaskFormSet, self).add_fields(form, index)
+        form.fields["feature_to"] = AutoCompleteSelectField('feature', required=False)
+
+# pass in the base formset class to the factory
+RelationFormSet = modelformset_factory(,fields=('feature_to','relationship_type'),extra=1,formset=BaseRelationsFormSet)