Relations one-to-many on django

Hello everybody!
I'm new on this forum and in django.
I'm using Python 2.7 environment.

I have the following models.py:

class Categoria(models.Model):

    DEFAULT_CATHEGORY = 0
    nome = models.CharField(max_length=255, null=False, default='0')

    def __unicode__(self):
        return self.nome

class Produto(models.Model):

    nome = models.CharField(max_length=255, null=False)
    pontos_na_compra = models.DecimalField(decimal_places=4, max_digits=10, default=0)
    pontos_na_troca = models.DecimalField(decimal_places=4, max_digits=10, default=0)
    foto = models.ImageField(upload_to=get_image_path, blank=True, null=True)

    categoria = models.ForeignKey(
        Categoria,
        default=Categoria.DEFAULT_CATHEGORY
    )

    def __unicode__(self):
        return "%s, %s" % (self.nome, self.codigo_depara)

I want the relation: each Categoria (cathegory) has many Produto (products). Is it correct in the model?
I don't have anything on views.py relationed to it.

I want to do some code like this into HTML file:

show CATEGORIA.nome

for each PRODUTO in LIST OF PRODUCTS IN CATEGORIA do:

   show PRODUTO.nome

   show PRODUTO.pontos_na_compra

   show PRODUTO.foto

end-for

 
I try to use

{% if categorias %}
                            <ul id="flexisel">
                        {% for categoria in produto.categoria_set() %}
                                <li>
                                    # SHOW ALL HERE. HOW?
                                </li>
                        {% endfor %}
                        </ul>
                  {% else %}
                  <p id="flexise">
                     Nenhum produto encontrado!
                  </p>
                  {% endif %}

But it didn't find the categoria_set() method and returns this:

Could not parse the remainder: '()' from 'produto.categoria_set()'

Request Method:	GET
Request URL:	http://127.0.0.1:8000/
Django Version:	1.9.2
Exception Type:	TemplateSyntaxError
Exception Value:	Could not parse the remainder: '()' from 'produto.categoria_set()'
Exception Location:	/home/dsbonafe/.virtualenvs/bruno/local/lib/python2.7/site-packages/django/template/base.py in parse, line 516
Python Executable:	/home/dsbonafe/.virtualenvs/bruno/bin/python
Python Version:	2.7.6
Python Path:	['/home/dsbonafe/Documentos/Projetos/Bruno Mercado/bruno/redewebsite', '/home/dsbonafe/.virtualenvs/bruno/lib/python2.7', '/home/dsbonafe/.virtualenvs/bruno/lib/python2.7/plat-x86_64-linux-gnu', '/home/dsbonafe/.virtualenvs/bruno/lib/python2.7/lib-tk', '/home/dsbonafe/.virtualenvs/bruno/lib/python2.7/lib-old', '/home/dsbonafe/.virtualenvs/bruno/lib/python2.7/lib-dynload', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib/python2.7/lib-tk', '/home/dsbonafe/.virtualenvs/bruno/local/lib/python2.7/site-packages', '/home/dsbonafe/.virtualenvs/bruno/lib/python2.7/site-packages']
Server time:	Ter, 23 Fev 2016 20:55:39 +0000

Someone could help me?

Thanks a lot.
 

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