Add command to minimise registrations data

docs/registrations.management.commands.rst

+registrations.management.commands package
+=========================================
+
+.. automodule:: registrations.management.commands
+    :members:
+    :undoc-members:
+    :show-inheritance:
+
+Submodules
+----------
+
+registrations.management.commands.minimiseregistrations module
+--------------------------------------------------------------
+
+.. automodule:: registrations.management.commands.minimiseregistrations
+    :members:
+    :undoc-members:
+    :show-inheritance:
+
+

docs/registrations.management.rst

+registrations.management package
+================================
+
+.. automodule:: registrations.management
+    :members:
+    :undoc-members:
+    :show-inheritance:
+
+Subpackages
+-----------
+
+.. toctree::
+
+    registrations.management.commands
+

docs/registrations.rst

@@ -6,6 +6,13 @@ registrations package
     :undoc-members:
     :show-inheritance:
 
+Subpackages
+-----------
+
+.. toctree::
+
+    registrations.management
+
 Submodules
 ----------
 

website/registrations/management/commands/minimiseregistrations.py

+from django.core.management import BaseCommand
+
+from registrations import services
+
+
+class Command(BaseCommand):
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            '--dry-run',
+            action='store_true',
+            dest='dry-run',
+            default=False,
+            help='Dry run instead of saving data',
+        )
+
+    def handle(self, *args, **options):
+        services.execute_data_minimisation(options['dry-run'])

website/registrations/services.py

@@ -415,3 +415,22 @@ def process_payment(payment):
         entry.membership = membership
         entry.status = Entry.STATUS_COMPLETED
         entry.save()
+
+
+def execute_data_minimisation(dry_run=False):
+    """
+    Delete completed or rejected registrations that were modified
+    at least 31 days ago
+
+    :param dry_run: does not really remove data if True
+    :return: number of removed registrations
+    """
+    deletion_period = timezone.now().date() - timezone.timedelta(days=31)
+    objects = (Entry.objects
+               .filter((Q(status=Entry.STATUS_COMPLETED)
+                        | Q(status=Entry.STATUS_REJECTED))
+                       & Q(updated_at__lt=deletion_period)))
+
+    if dry_run:
+        return objects.count()
+    return objects.delete()[0]

website/registrations/tests/test_management.py

+from unittest import mock
+from unittest.mock import MagicMock
+
+from django.test import TestCase
+
+from registrations.management.commands.minimiseregistrations import Command
+
+
+class ManagementMinimiseTest(TestCase):
+
+    def test_add_argument(self):
+        mockParser = MagicMock()
+        Command().add_arguments(mockParser)
+        mockParser.add_argument.assert_called_with(
+            '--dry-run',
+            action='store_true',
+            default=False,
+            dest='dry-run',
+            help='Dry run instead of saving data'
+        )
+
+    @mock.patch('registrations.services.execute_data_minimisation')
+    def test_handle(self, execute_data_minimisation):
+        Command().handle({}, **{'dry-run': False})
+        execute_data_minimisation.assert_called_with(False)
+        Command().handle({}, **{'dry-run': True})
+        execute_data_minimisation.assert_called_with(True)

website/registrations/tests/test_services.py

@@ -569,3 +569,39 @@ class ServicesTest(TestCase):
                 for payment in Payment.objects.filter(pk__in=[p1.pk, p2.pk]):
                     services.process_payment(payment)
                     self.assertFalse(create_membership.called)
+
+    @freeze_time('2019-01-01')
+    def test_execute_data_minimisation(self):
+        with self.subTest('No processed entries'):
+            self.assertEqual(services.execute_data_minimisation(), 0)
+
+        with freeze_time('2018-09-01'):
+            self.e0.status = Entry.STATUS_COMPLETED
+            self.e0.save()
+
+        with self.subTest('Has processed entries when completed'):
+            self.assertEqual(services.execute_data_minimisation(), 1)
+
+        with freeze_time('2018-09-01'):
+            self.e0.status = Entry.STATUS_REJECTED
+            self.e0.save()
+
+        with self.subTest('Has processed entries when rejected'):
+            self.assertEqual(services.execute_data_minimisation(), 1)
+
+        with freeze_time('2018-09-01'):
+            self.e0.status = Entry.STATUS_COMPLETED
+            self.e0.save()
+
+        with self.subTest('Has processed entries when '
+                          'rejected with dry-run'):
+            self.assertEqual(services.execute_data_minimisation(True), 1)
+
+        self.e0.status = Entry.STATUS_COMPLETED
+        self.e0.save()
+
+        with self.subTest('No processed entries when inside 31 days'):
+            self.assertEqual(services.execute_data_minimisation(), 0)
+
+        self.e0.status = Entry.STATUS_REVIEW
+        self.e0.save()