Add created_field to license

server/users/migrations/0028_license_created_at.py

@@ -0,0 +1,25 @@
+# Generated by Django 2.2.24 on 2021-09-09 11:39
+
+from datetime import datetime
+from django.db import migrations, models
+from django.utils.timezone import make_aware
+
+from users.models import NO_DATE
+
+MIN_DATE = datetime.combine(NO_DATE, datetime.min.time())
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('users', '0027_auto_20210414_2116'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='license',
+            name='created_at',
+            field=models.DateTimeField(auto_now_add=True, default=make_aware(MIN_DATE)),
+            preserve_default=False,
+        ),
+    ]

server/users/models.py

@@ -2,7 +2,7 @@ import json
 import random
 import re
 import string
-from datetime import date, datetime, timedelta
+from datetime import date, datetime, timedelta, MINYEAR
 from typing import Union
 
 from django.contrib.auth import get_user_model
@@ -18,6 +18,7 @@ from users.licenses import MYSKILLBOX_LICENSES
 from users.managers import LicenseManager, RoleManager, UserManager, UserRoleManager
 
 DEFAULT_SCHOOL_ID = 1
+NO_DATE = date(MINYEAR, 1, 1)  # date to tag licenses without tag
 
 
 class User(AbstractUser):
@@ -306,10 +307,11 @@ class License(models.Model):
     raw = models.TextField(default='')
     isbn = models.CharField(max_length=50, blank=False, null=False,
                             default=list(MYSKILLBOX_LICENSES.keys())[0])  # student license
+    created_at = models.DateTimeField(auto_now_add=True)
 
     objects = LicenseManager()
 
-    NO_DATE = date(2011, 10, 7)  # used to tag licenses without start date
+    NO_DATE = NO_DATE
 
     def is_teacher_license(self):
         return self.for_role.key == RoleManager.TEACHER_KEY