optionally wifi measurements when the event data is purged

src/c3nav/mapdata/management/commands/cleareventdata.py

@@ -11,13 +11,14 @@ class Command(BaseCommand):
     help = 'Wipes users, changesets and mapupdates to reset a instance'
 
     def add_arguments(self, parser):
-        parser.add_argument('--yes', action='store_const', const=True, default=False,
+        parser.add_argument('--yes', action='store_true', help='really delete it')
-                            help='really delete it')
+        parser.add_argument('--wifi-measurements', action='store_true', help='delete wifi measurements')
 
     def handle(self, *args, **options):
         from c3nav.control.models import UserPermissions
         from c3nav.mapdata.models import MapUpdate
         from c3nav.mapdata.models.access import AccessPermissionToken
+        from c3nav.mapdata.models.geometry.space import WifiMeasurement
         from c3nav.editor.models import ChangeSet
         from c3nav.site.models import Announcement
         from django.contrib.auth import get_user_model
@@ -44,6 +45,10 @@ class Command(BaseCommand):
             UserPermissions.objects.filter(user__is_superuser=False).delete()
             logger.info('Deleted all UserPermissions not attached to a super user')
 
+            if options['wifi_measurements']:
+                WifiMeasurement.objects.all().delete()
+                logger.info('Deleted all WifiMeasurements')
+
             get_user_model().objects.filter(is_superuser=False).delete()
             logger.info('Deleted all Users who are not a super user')
 

src/c3nav/mapdata/migrations/0072_make_wifi_measurement_author_nullable.py

@@ -0,0 +1,20 @@
+# Generated by Django 2.1.3 on 2019-11-27 16:15
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mapdata', '0008_validate_slug'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='wifimeasurement',
+            name='author',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='wifi_measurements', to=settings.AUTH_USER_MODEL, verbose_name='author'),
+        ),
+    ]

src/c3nav/mapdata/models/geometry/space.py

@@ -357,7 +357,8 @@ class WifiMeasurement(SpaceGeometryMixin, models.Model):
     A Wi-Fi measurement
     """
     geometry = GeometryField('point')
-    author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.PROTECT, verbose_name=_('author'))
+    author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True,
+                               verbose_name=_('author'))
     comment = models.TextField(null=True, blank=True, verbose_name=_('comment'))
     data = JSONField(_('Measurement list'))