Display the value of a Manytomany Django object in the template?

Question

Hey, sorry for the confusing question (I don’t know exactly how to ask this), but come on. I’m wearing Django2.1.

I have these 2 models related so ManyToMany:

class Ingrediente(models.Model):
produtor = models.ForeignKey('auth.User', on_delete=models.CASCADE, default=10)
nome = models.CharField(max_length=200)
descricao = models.TextField()
quantidade = models.DecimalField(max_digits=10, decimal_places=3)
custo = models.DecimalField(max_digits=10, decimal_places=2)

def __str__(self):
    return self.nome

and

class Produto(models.Model):
nome = models.CharField(max_length=200)
descricao = models.TextField()
ingredientes = models.ManyToManyField(Ingrediente)
utilitarios = models.ManyToManyField(OutrosCustos)

def __str__(self):
    return self.nome

Following use view to return a list of all objects in the Product class:

def produtos_list(request):
produtos = Produto.objects.filter()
return render(request, 'egg_app/produtos_list.html', {'produtos':produtos})

Then the joke, in my template I return this way:

<table class="table">
<thead>
    <tr>
        <th scope="col">Nº Produto</th>
        <th scope="col">Nome</th>
        <th scope="col">Ingredientes</th>
        <th scope="col">Custo</th>
    </tr>
</thead>
<tbody>
    {% for p in produtos %}
        <tr>
            <th scope="row">{{ p.pk }}</th>
            <td>{{ p.nome }}</td>
            <td>{{ p.ingredientes }}</td>
            <td>custo teste</td>
        </tr>
    {% endfor %}
</tbody>

And my result has been:

I would like in the Ingredients column to have the names of the Ingredients and not that Ingredient.None.

Answer 1

According to the image, the variable "ingredients" is empty, Django’s default is to start the variable "None"(empty), so the problem should be at the beginning. Must be a little typo. You are using the product class to list, check where the variable "ingredients" receives the data, the problem should be in the there.

Link: https://stackoverflow.com/questions/16459890/django-template-display-item-value-or-empty-string

Answer 2

Come on, I got a solution.

First of all, the screening I was trying wasn’t pleasant, so I changed things. Instead of releasing everything in this table, I made a link in the name of each product, and launched it to a page of individual details. And there I made a list of the following logic:

To return a list with Queryset of all objects, I need this (which I was taught here:

 produtos.ingredientes.all

But unfortunately it returns a pure Queryset, something like:

<QuerySet [<Ingrediente: Ingrediente Teste 1>, <Ingrediente: Ingrediente Teste 2>]>

Still in the same comment, the friend suggested me a go, and then I did and that way I got the expected result:

{% for ingredientes_desse_produto in produtos.ingredientes.all %}
    <div class="col">
        <div class="card">
            <div class="card-body">
                <h5 class="card-title">{{ ingredientes_desse_produto.nome }}</h5>
                <p class="card-text">{{ ingredientes_desse_produto.custo }}</p>
            </div>
        </div>
    </div>
    {% endfor %}

I go through all the results with the first for, and use the individual attributes of the object just below.