Add django-nested-formset as dependency and with a small fix for fields

apps/contrib/nested_formset.py

@@ -0,0 +1,43 @@
+from django.forms import inlineformset_factory
+from nested_formset import BaseNestedFormset
+from nested_formset import BaseNestedModelForm
+
+
+def nestedformset_factory(parent_model, model, nested_formset,
+                          form=BaseNestedModelForm,
+                          formset=BaseNestedFormset, fk_name=None,
+                          fields=None, exclude=None, extra=3,
+                          can_order=False, can_delete=True,
+                          max_num=None, formfield_callback=None,
+                          widgets=None, validate_max=False,
+                          localized_fields=None, labels=None,
+                          help_texts=None, error_messages=None,
+                          min_num=None, validate_min=None):
+    kwargs = {
+        'form': form,
+        'formfield_callback': formfield_callback,
+        'formset': formset,
+        'extra': extra,
+        'can_delete': can_delete,
+        'can_order': can_order,
+        'fields': fields,
+        'exclude': exclude,
+        'min_num': min_num,
+        'validate_min': validate_min,
+        'max_num': max_num,
+        'widgets': widgets,
+        'validate_max': validate_max,
+        'localized_fields': localized_fields,
+        'labels': labels,
+        'help_texts': help_texts,
+        'error_messages': error_messages,
+    }
+
+    NestedFormSet = inlineformset_factory(
+        parent_model,
+        model,
+        **kwargs
+    )
+    NestedFormSet.nested_formset_class = nested_formset
+
+    return NestedFormSet

requirements/base.txt

@@ -14,3 +14,4 @@ bleach==2.0.0
 # django multiform (released version 0.1 was too old)
 git+git://github.com/bmispelon/django-multiform.git@0e02f0d5729a80502a290070b474f3e3ac85c926
 jsonfield==2.0.1
+django-nested-formset==0.1.4