Move apps in main directory

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

registration/tables.py

@@ -0,0 +1,31 @@
+# Copyright (C) 2020 by Animath
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+from django.utils.translation import gettext_lazy as _
+import django_tables2 as tables
+
+from .models import Registration
+
+
+class RegistrationTable(tables.Table):
+    """
+    Table of all registrations.
+    """
+    last_name = tables.LinkColumn(
+        'registration:user_detail',
+        args=[tables.A("user_id")],
+        verbose_name=lambda: _("last name").capitalize(),
+        accessor="user__last_name",
+    )
+
+    def order_type(self, queryset, desc):
+        types = ["volunteerregistration", "-volunteerregistration__admin", "participantregistration"]
+        return queryset.order_by(*(("-" if desc else "") + t for t in types)), True
+
+    class Meta:
+        attrs = {
+            'class': 'table table-condensed table-striped',
+        }
+        model = Registration
+        fields = ('last_name', 'user__first_name', 'user__email', 'type',)
+        order_by = ('type', 'last_name', 'first_name',)