agendas: add unique_together meta to VirtualMember (#42413)

chrono/agendas/migrations/0042_auto_20200503_1231.py

@@ -0,0 +1,16 @@
+# Generated by Django 2.2.12 on 2020-05-03 12:31
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('agendas', '0041_clean_event_slug_unicity'),
+    ]
+
+    operations = [
+        migrations.AlterUniqueTogether(
+            name='virtualmember', unique_together={('virtual_agenda', 'real_agenda')},
+        ),
+    ]

chrono/agendas/models.py

@@ -289,6 +289,9 @@ class VirtualMember(models.Model):
         Agenda, on_delete=models.CASCADE, related_name='virtual_members', verbose_name='Agenda'
     )
 
+    class Meta:
+        unique_together = (('virtual_agenda', 'real_agenda'),)
+
     def clean(self):
         error_msg = [_('This agenda does not have the same meeting types provided by the virtual agenda.')]
         error = False