Further work on multi-file-upload

apps/map/widgets.py

@@ -0,0 +1,21 @@
+from django.forms import widgets
+
+
+class CommaSeparatedTextInput(widgets.HiddenInput):
+    def format_value(self, value):
+        try:
+            value = ','.join(value)
+        except TypeError:
+            value = ''
+        return super().format_value(value)
+
+    def value_from_datadict(self, data, files, name):
+        value = super().value_from_datadict(data, files, name)
+
+        if value == '':
+            return None
+
+        try:
+            return value.split(',')
+        except AttributeError:
+            return None