Filter using ObjectId

I want to make a query, but I need to use the ObjectId, but do not know how to do.

The question is, have players and clubs and want to make a query to the players by the id of the club, to know how many players are from that club.

What I am trying to do is:

class Club(mongoengine.Document):

    ClubName = StringField()

    

class Player(mongoengine.Document):

    PlayerName = StringField()

    PlayerAge = IntField()

    PlayerClub = fields.ListField(fields.ReferenceField(Club,

                        reverse_delete_rule=CASCADE, dbref=False))

class PlayerResource(resources.MongoEngineResource):

    

    PlayerClub = fields.ReferencedListField(of='Rela.Resource.ClubResource',

         attribute='PlayerClub', full=True, null=True)

    

    class Meta:

        queryset = Player.objects.all()

        allowed_methods = ('get', 'post', 'put', 'delete')

        list_allowed_methods = ['get', 'post','put', 'delete']

        authorization = Authorization()

        resource_name = 'Player'

        filtering = {

            'PlayerClub': ALL_WITH_RELATIONS,

class ClubResource(resources.MongoEngineResource):

    

    class Meta:

        queryset = Club.objects.all()

        allowed_methods = ('get', 'post', 'put', 'delete')

        list_allowed_methods = ['get', 'post','put', 'delete']

        authorization = Authorization()

        resource_name = 'Club'

But when I do the query by id PlayerClub the club, it returns me []

So I guess I need to use the ObjectId, to make the query by id, but do not know how to put in the filtering.

Someone can help me?

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