put roles at the right place when they are created

club/models.py

@@ -278,6 +278,7 @@ class ClubRole(OrderedModel):
             )
         if (
             self.is_board
+            and self.order
             and self.club.roles.filter(is_board=False, order__lt=self.order).exists()
         ):
             errors.append(
@@ -290,6 +291,19 @@ class ClubRole(OrderedModel):
             raise ValidationError(errors)
         return super().clean()
 
+    def save(self, *args, **kwargs):
+        auto_order = self.order is None and self.is_board
+        if not auto_order:
+            super().save(*args, **kwargs)
+            return
+        filters = Q(is_board=False)
+        if self.is_presidency:
+            filters |= Q(is_board=True, is_presidency=False)
+        next_role = self.club.roles.filter(filters).order_by("order").first()
+        super().save(*args, **kwargs)
+        if next_role:
+            self.above(next_role)
+
 
 class MembershipQuerySet(models.QuerySet):
     def ongoing(self) -> Self:

club/tests/test_clubrole.py

@@ -0,0 +1,33 @@
+import pytest
+from model_bakery import baker, seq
+from model_bakery.recipe import Recipe
+
+from club.models import Club, ClubRole
+
+
+@pytest.mark.django_db
+def test_order_auto():
+    """Test that newly created roles are put in the right place."""
+    club = baker.make(Club)
+    recipe = Recipe(ClubRole, club=club, name=seq("role "))
+    # bulk create initial roles
+    roles = recipe.make(
+        is_board=iter([True, True, False]),
+        is_presidency=iter([True, False, False]),
+        order=iter([1, 2, 3]),
+        _quantity=3,
+        _bulk_create=True,
+    )
+    # then create the remaining roles one by one (like they will be in prod)
+    # each new role should be placed at the end of its category
+    role_a = recipe.make(is_board=True, is_presidency=True, order=None)
+    role_b = recipe.make(is_board=True, is_presidency=False, order=None)
+    role_c = recipe.make(is_board=False, is_presidency=False, order=None)
+    assert list(club.roles.order_by("order")) == [
+        roles[0],
+        role_a,
+        roles[1],
+        role_b,
+        roles[2],
+        role_c,
+    ]