Selects nested with Django and AJAX

I am doing tests for a form that I must do and the most important thing are two combo boxes, where the second one depends on the choice of the first one. I have done many tests with different methods but I have not achieved the result I need.

I currently have these files in my project:

forms.py:

from django import forms
from .models import TblInfoCatalogoValores
from .choices import tupla_lista, tupla_lista_2

class pruebaForm(forms.Form):
    multiple_choice = forms.ChoiceField(
        label=u"Select multiple", 
        choices=tupla_lista, 
        widget=forms.widgets.Select, 
        initial=(c[0] for c in tupla_lista)
    )

    multiple_choice_2 = forms.ChoiceField(
        label=u"Select multiple 2", 
        choices=tupla_lista_2, 
        widget=forms.widgets.Select, 
        initial=(d[0] for d in tupla_lista_2)
    )

For the options I have a choices.py file with the following:

from .models import TblInfoCatalogoValores
#-----------------------Primer Select-----------------------
tupla = []
query_1 = TblInfoCatalogoValores.objects.filter(id_catalogo = 22).values_list("valor", "des_valor")
for i in query_1:
    tupla.append(i)
tupla_lista =  tuple(tupla)
#-----------------------Segundo Select-----------------------
tupla_2 = []
query_2 = TblInfoCatalogoValores.objects.filter(id_catalogo = 23).values_list("valor", "des_valor")
for e in query_2:
    tupla_2.append(e)

tupla_lista_2 = tuple(tupla_2)

The model I'm using is this: models.py

class TblInfoCatalogoValores(models.Model):
    id_valor = models.AutoField(db_column='ID_VALOR', primary_key=True)  
    id_catalogo = models.ForeignKey(TblInfoCatalogoId, models.DO_NOTHING, db_column='ID_CATALOGO')  
    valor = models.CharField(db_column='VALOR', max_length=10)  
    des_valor = models.CharField(db_column='DES_VALOR', max_length=150, blank=True, null=True)  
    val_1 = models.CharField(db_column='VAL_1', max_length=20, blank=True, null=True)  
    val_2 = models.CharField(db_column='VAL_2', max_length=20, blank=True, null=True)  
    val_3 = models.CharField(db_column='VAL_3', max_length=20, blank=True, null=True)  
    val_4 = models.CharField(db_column='VAL_4', max_length=20, blank=True, null=True)  
    val_5 = models.CharField(db_column='VAL_5', max_length=20, blank=True, null=True)  
    val_6 = models.CharField(db_column='VAL_6', max_length=20, blank=True, null=True)  
    val_7 = models.CharField(db_column='VAL_7', max_length=20, blank=True, null=True)  
    orden = models.IntegerField(db_column='ORDEN', blank=True, null=True)  

    class Meta:
        managed = False
        db_table = 'TBL_INFO_CATALOGO_VALORES'

And what I'm using from this table is this. Where ID_CATALOGO = 22 , would be the data of the first select and ID_CATALOGO = 23 are the data that depend on the first select:

I have this in my views.py :

from .forms import pruebaForm

def pruebaViewForm(request):
    formulario = pruebaForm()

    if request.method == 'POST':
        formulario = pruebaForm(request.POST)
        if formulario.is_valid():
            url = reverse('inicio') 
            return HttpResponseRedirect(url)
    return render(request, 'pruebaForm.html', 
        {'formulario_prueba': formulario}
)

In my ajax.py I have problems, and I do not know how to solve them ... I do not know how to compare the values:

from django.http import JsonResponse
from .models import TblInfoCatalogoValores
from .choices import tupla_lista, tupla_lista_2

def get_sub_objetivo(request):
    objetivo_id = request.GET.get("objetivo_id")
    sub_objetivos = tupla_lista_2
    options = '<option value = "" disabled>*********</option>'

    for sub_objetivo in sub_objetivos:
        options += '<option value = "%s">%s</option>' % (
            sub_objetivo.val_1,
            sub_objetivo.valor
        )

    response = {}
    response['sub_objetivos'] = options
    return JsonResponse(response)

For the ajax function I am using this in my urls.py file:

url(r'^ajax/get_sub_objetivo/$', get_sub_objetivo, name='get_sub_objetivo')

And in my template.html I have this:

<h1>Formulario de prueba</h1>
<form method="POST">
    {% csrf_token %}
    <div>
        {{ formulario_prueba.multiple_choice.label_tag }}
        {{ formulario_prueba.multiple_choice}}
    </div>
    <div>
        {{ formulario_prueba.multiple_choice_2.label_tag }}
        {{ formulario_prueba.multiple_choice_2}}
    </div>
    <input type="submit" name="Enviar">
</form>

<script type="text/javascript">
    //Le doy la función de onchange al select de sub-objetivos.
    $(document).ready(function(){
        $("#id_multiple_choice").on("change", getSubObjetivos);
    });
    function getSubObjetivos(){
        var id_select_1 = $("#id_multiple_choice").val();

        if (id_select_1) { alert(id_select_1)} //esto es una prueba
        if (id_select_1) {
            $("#id_multiple_choice_2").html("");
            alert("Entro!!!!!!!!"); //Esto es una prueba

            var request = $.ajax(
                {
                    type: "GET",
                    url: "{% url 'get_sub_objetivo' %}",
                    data: {
                        "objetivo_id": id_select_1
                    },
                    success:  function (response) {
                        $("#id_multiple_choice_2").html(response.sub_objetivos);
                    }
                }
            );

            request.done(function(response){
                alert("Regreso"); //Esto es una prueba
                $("#id_multiple_choice").html(response.sub_objetivos);
                $("#id_multiple_choice_2").trigger("change");
            });
        } 
        else {
            alert("Error"); //esto es una prueba
            $("#id_multiple_choice_2").html("<option value='' selected='selected'>-------</option>");
            $("#id_multiple_choice_2").trigger("change");
        }
    }
</script>

This I did by guiding me on this example

Thanks for your answers.