Use JSON serialization to store attribute values in migration script

portail_citoyen/management/commands/export-for-authentic.py

@@ -1,6 +1,7 @@
 import sys
 import locale
 import logging
+import json
 
 from django.contrib.auth.models import User, Group
 from django.contrib.auth import get_user_model
@@ -113,7 +114,7 @@ class Command(BaseCommand):
                             required=required)
                 av = AttributeValue(
                         attribute=attributes[field.attname],
-                        content=value)
+                        content=json.dumps(value))
                 av.owner = new_user
                 attribute_values.append(av)
         for attribute in attributes.values():