core: add UserIsRootMixin and an admin delete view for memberships

club/urls.py

@@ -91,6 +91,11 @@ urlpatterns = [
         MembershipSetOldView.as_view(),
         name="membership_set_old",
     ),
+    re_path(
+        r"^membership/(?P<membership_id>[0-9]+)/delete$",
+        MembershipDeleteView.as_view(),
+        name="membership_delete",
+    ),
     re_path(
         r"^(?P<club_id>[0-9]+)/poster$", PosterListView.as_view(), name="poster_list"
     ),

club/views.py

@@ -43,6 +43,7 @@ from core.views import (
     CanViewMixin,
     CanEditMixin,
     CanEditPropMixin,
+    UserIsRootMixin,
     TabedViewMixin,
     PageEditViewBase,
     DetailFormView,
@@ -493,6 +494,19 @@ class MembershipSetOldView(CanEditMixin, DetailView):
         )
 
 
+class MembershipDeleteView(UserIsRootMixin, DeleteView):
+    """
+    Delete a membership (for admins only)
+    """
+
+    model = Membership
+    pk_url_kwarg = "membership_id"
+    template_name = "core/delete_confirm.jinja"
+
+    def get_success_url(self):
+        return reverse_lazy("core:user_clubs", kwargs={"user_id": self.object.user.id})
+
+
 class ClubStatView(TemplateView):
     template_name = "club/stats.jinja"