Problem when creating a form for adding users to groups

Hi. 

I ran into a problem and have searched the group, in the official django and the internet and could not solve the problem.

I created a form that lists all the groups created and all user created and this adds form users within groups.

Already tried two ways and both give error

form.py

class alterar_usuario(forms.Form):

Usuario = forms.ModelMultipleChoiceField(queryset= User.objects.all() )

Grupo = forms.ModelMultipleChoiceField(queryset = Group.objects.all())

(way 1)

view.py

def cadastrarUsuarioGrupo(request):

    if request.method == "POST":   

        form = alterar_usuario(request.POST)

        

        if form.is_valid():

            Usuario = form.cleaned_data['Usuario']

            Grupo = form.cleaned_data['Grupo']

            usuarioOb = User.objects.get(id = Usuario)

            groupOb = Group.objects.get(id = Grupo)

            

            usuarioOb.groups.add(groupOb)

(way 2)

view.py

def cadastrarUsuarioGrupo(request):

    if request.method == "POST":   

        form = alterar_usuario(request.POST)

        

        if form.is_valid():

            Usuario = form.cleaned_data['Usuario']

            Grupo = form.cleaned_data['Grupo']

            usuarioOb = User.objects.filter(id = Usuario)

            groupOb = Group.objects.filter(id = Grupo)

            for user, group in usuarioOb, groupOb:

              user = usuarioOb.user

              group = grupoOb.groups

              usuer.groups.add(group)

Grateful.

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