Add import_ref to group

aleksis/core/migrations/0015_add_import_ref_to_group.py

+# Generated by Django 3.0.4 on 2020-03-26 23:51
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0014_accouncement_recipients'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='group',
+            name='import_ref',
+            field=models.CharField(blank=True, editable=False, max_length=200, null=True, unique=True, verbose_name='Reference ID of import source'),
+        ),
+    ]

aleksis/core/models.py

@@ -229,6 +229,15 @@ class Group(ExtensibleModel):
         blank=True,
     )
 
+    import_ref = models.CharField(
+        verbose_name=_("Reference ID of import source"),
+        max_length=200,
+        blank=True,
+        null=True,
+        editable=False,
+        unique=True,
+    )
+
     @property
     def announcement_recipients(self):
         return list(self.members.all()) + list(self.owners.all())