CODEWITHSUNDEEP
django
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Reputation: 753

Error during template rendering in Django

I am trying to submit this form to my view:

in pcq_select.html

<form action="{% url 'pcq_list' product_id %}" method="POST">{% csrf_token %}
<label>Select the Product:
<select name="product_id">
    {% for entry in products %}
        <option value="{{ entry.id }}">{{ entry.productname }}</option>
    {% endfor %}
</select>
<input type="submit" value="Go"></label>
</form>

in views.py

def pcq_select(request, template_name='maps/pcq/pcq_select.html'):
    product = Product.objects.all()
    return render(request, template_name, {'products': product})


def pcq_list(request, product_id="1"):
    pcq = Pcq.objects.filter(product_id=product_id)
    data = {}
    data['object_list'] = pcq
    return render(request, 'maps/pcq/pcq_list.html', data)

in urls.py

url(r'^pcq/list/(\d+)/$', views.pcq_list, name='pcq_list'),

I get the following error:

Exception Type: NoReverseMatch Exception Value: Reverse for 'pcq_list' with arguments '('',)' and keyword arguments '{}' not found. 1 pattern(s) tried: ['maps/pcq/list/(\d+)/$']

Error during template rendering

In template E:\SampleSite\templates\maps\pcq\pcq_select.html, error at line 1

But when I replace the product_id in the action url with a number (example 1), the whole thing works good. Kindly help.

Upvotes: 2

Views: 28876

Answers (3)

David Dahan
David Dahan

Reputation: 11192

The correct syntax is something like this:

{% for p in products %} <!-- Let's assume there are several products ... -->
    ...
    <form action="{% url 'pcq_list' product_id=p.pk %}" method="POST">{% csrf_token %}
    ...
{% endfor %}

Then, you have to specify in your urls.py that the url is waiting for an id this way:

url(r'^pcq/list/(?P<product_id>\d+)$', views.pcq_list, name='pcq_list')

You can not write product_id as is, since the template does not know this variable.

Upvotes: 4

Alex
Alex

Reputation: 8539

Are you passing a product to the template? If so, change your original product_id to product.id.

I.e.: 

<form action="{% url 'pcq_list' product.id %}" method="POST">{% csrf_token %}

Upvotes: -1

Daniel Roseman
Daniel Roseman

Reputation: 600059

You don't show your view, but it looks like you are not passing anything called product_id to the template.

Upvotes: 1

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