ManyToManyField select only results that match

Hi all,

I got a form where i use a manytomany field likes this

kleurogen = models.ManyToManyField(Keuzes, blank=True, null=True)

This works fine but takes all the results from Keuzes
How can i only get the results from Keuzes that have the groep 'kleurogen'

i tried this but it doesnt work

kleurogen = models.ManyToManyField(Keuzes.objects.filter(groep_id="kleurogen"), blank=True, null=True)

AssertionError: ManyToManyField([<Keuzes: Blauw>, <Keuzes: Paars>]) is invalid. First parameter to ManyToManyField must be either a model, a model name, or the string 'self'

How can i do this?

in Keuzes i have

class Keuzes (models.Model):

    name = models.CharField(max_length=255)

    groep = models.ForeignKey(Keuzegroepen)

    

    def __unicode__(self):

        return self.name

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