Relations one-to-many on django

[Douglas Bonafe]

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.
 

[James Schneider]

>  
> I try to use
>>
>> {% if categorias %}
>>                             <ul id="flexisel">
>>                         {% for categoria in produto.categoria_set() %}

At no time can parentheses be used when referencing variables. The correct way to write this tag would be {% for categoria in produto.categoria_set %}.

Make sure to review the template syntax for accessing context variables and methods: https://docs.djangoproject.com/en/1.9/ref/templates/language/#variables

-James

[Vijay Khemlani]

Each product is only associated with one category, so you can only do 

produto.categoria

If you want to iterate over all categories, and then through the products of each category, you could do

{% for categoria in categorias %}

{% for produto in categoria.produto_set.all %}

do comething with produto

{% endfor %}

{% endfor %}

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