[Answer]-Django – Grouping users in Admin

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# models.py
class News(models.Model):
    group = models.ForeignKey(Group)
    users = models.ManyToManyField(User)

# forms.py
class NewsAdminForm(forms.ModelForm):
    class Meta:
        model = News

    def __init__(self, *args, **kwargs):
        super(News, self).__init__(*args, **kwargs)
        if self.instance.group is not None:
            # here self.instance.group is need you group (programmers, managers etc.)
            users_queryset = User.objects.filter(groups=self.instance.group) 
            self.filelds['users'].choices = [(u.id, u.username) for u in users_queryset)

# admin.py
class NewsAdmin(admin.ModelAdmin):
    form = NewsAdminForm
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