Pick a select value in Django

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The HTML code:

<!doctype html>
<html lang="pt-br">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <h1 align="center">Produtos</h1>
    {% block content %}
    <form action = "{% url 'produtos' %}" method="POST">
        {% csrf_token %}
        <div class="form-group">
            <legend class="lead">PRODUTOS </legend>
            <select name="m" class="form-control">
            {% for marcas in m %}
                <option value="{{marcas.codigo_id}}">{{ marcas }}</option>
            {% endfor %}
            </select>

            <select name="anome" id="anome">
            {% for aparelhos in a %}
                <option value="aparelhos">{{ aparelhos }}</option>
            {% endfor %}
            </select>

            <select name="pnome" id="pnome">
            {% for produtos in p %}
                <option value="produtos">{{ produtos }}</option>
            {% endfor %}
            </select>
            <input type = 'submit' value="Submit">
        </div>
    </form>
    {% endblock content %}
    </body>
</html>

The Django code (Views)

from django.shortcuts import render
from .models import Marcas, Aparelhos, 
Produtos

def marcas(request):
    mnome = request.POST.get("mnome", None)
    anome = request.POST.get("anome", None)

    if request.method == 'POST':
        import pdb
        pdb.set_trace()
        if mnome:
            m = Marcas.objects.all()
            if m == 'Apple':
                anome = a
                a = Aparelhos.objects.filter(marca_id=1)
            else:
                anome = a
                a = Aparelhos.objects.filter(marca_id=1)


    return render(request, 'produtos.html',{'a': a, 'm': m })

So how do I capture a selected value in my select(html) and use it in my views.

python python-3.x django django-2.0 django-queryset

1 answer

2


From the point of view of good data modeling you should have defined in Models an association between Aparelho and Fabricante (since an appliance is produced by a manufacturer) but the little that is described of the code is not possible to know if it really exists. But I will consider it in the example and consider that Models is more or less like this:

class Aparelho(models.Model):
    nome = models.CharField(max_length=80)

class Aparelho(models.Model):
    nome = models.CharField(max_length=80)
    fabricante = models.ForeignKey(
        Fabricante, on_delete=models.CASCADE, related_name="aparelho_fabricante"
    )

Accordingly, in Views you need to add the list of manufacturers to the scope of variables you send to the template:

# ...
contexto = {
    # aqui o que você já passa para o contexto
    "fabricantes": Fabricante.objects.all()
    }
return render(request, "template.html", contexto)

Hence in the template you can make use:

<select>
{% for fabr in fabricantes %}
    <option value="{{ fabr.id }}">{{ fabr.nome }}</option>
{% endfor %}
</select>

Hence, the function that will receive the data in Views will already have the id correct that you need to use.

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