Getting `KeyError` when using `.exclude` in a `QuerySetProxy`

[satinfive]

Discussed in #1086

^{Originally posted by satinfive May 21, 2023}
Hi!

I am not sure if I am doing things right, that's why I wanted to ask before opening this as an issue.

I have defined two models: Battle and User:

class User(ormar.Model):

    class Meta(base.BaseMeta):
        tablename = "users"
        queryset_class = UserQuerySet

    id: str = ormar.String(primary_key=True, max_length=50)
    username: str = ormar.String(max_length=255)
    team_id: str = ormar.String(max_length=50)

class Battle(ormar.Model):
    class Meta(base.BaseMeta):
        tablename = "battles"

    id: int = ormar.Integer(primary_key=True, autoincrement=True)
    player1: models.User = ormar.ForeignKey(models.User, related_name="player1")
    player2: models.User = ormar.ForeignKey(models.User, related_name="player2")
    current_status: BattleStatus = ormar.String(max_length=100, default=BattleStatus.ONGOING.value, choices=list(BattleStatus), )
    winner: Optional[models.User] = ormar.ForeignKey(models.User, nullable=True, related_name="winner")

Given those, I have user_a as an instance of User. I want to fetch all users in database that are not in a battle with given user_a.
I tried to execute the following query:

            users_available_for_battle = await User.objects.available_in_workspace(
                team_id=team_id).exclude(
                id=user_a_id).select_related(
                ['player1', 'player2']).exclude(
                player1__id=user_a_id).exclude(
                player2_iid=user_a_id)

But I am getting all the time KeyError: player1 .

It's possible that I am not doing the query correctly, so I'd like some feedback to know if it's that the case or there is something that is not working properly in the library.

Thanks!