def test_split_players():
groups = split_players_to_groups(['a'] * 10)
assert groups == [['a'] * 5] * 2
groups = split_players_to_groups(['a'] * 6)
assert groups == [['a'] * 6]
groups = split_players_to_groups(['a'] * 16)
assert groups == [['a'] * 4] * 4
groups = split_players_to_groups(['a'] * 17)
assert groups == [['a'] * 5] + [['a'] * 4] * 3
def create_groups(self):
if self.groups.all().exists():
raise RuntimeError("groups are already created for this stage")
stage_participants = list(self.participants.all().order_by("?"))
if len(stage_participants) == 0:
raise RuntimeError("cannot create groups for empty stage")
groups = split_players_to_groups(stage_participants)
for idx, group in enumerate(groups):
dj_group = Group.objects.create(stage=self, name=chr(97 + idx).upper())
dj_group.participants.add(*group)
