Question

I’m a django newbie.

I have this model:

class Item(models.Model):
    name = models.CharField(max_length=255)
    quantity = models.IntegerField()

How to create view to update quantity of my all Item?

views:

def item_list(request):
    item = Product.objects.all()[:6]
    return render_to_response('item.html',{'item':item},context_instance=RequestContext(request))

form:

from django import forms

class QuantityForm(forms.Form):
    quan = forms.IntegerField()

template:

{% for i in item %}
    {{ i.name }}
    {{ i.quantity }}
{% endfor %}

I’m trying to do something like this(after clicking “update” value quantity in my model should be actualize):

Please any help. Thanks

Answer 1

First you need a view, which retrieves item id and quantity value, updates relative Item instance and redirects you back to the page. Here is an example:

from django.views.decorators.http import require_http_methods
from django.shortcuts import redirect, get_object_or_404

@require_http_methods(["POST"])
def update_item(request)
    id = request.POST.get('id', None) #retrieve id
    quantity = request.POST.get('q', None)  #retrieve quantity
    item = get_object_or_404(Item, id=id) #if no item found raise page not found
    if quantity:
        #updating item quantity
        item.quantity = quantity
        item.save()

    return redirect('my-item-list-view-name')

Also you need to create urlpattern for the view in your urls.py. For example:

...
url(r'^update-item/$', 'update_item', name='update_item'),
...

Then you can make a forms for each item on a template:

{% for i in item %}
    <form action="{% url 'update_item' %}" method="post">
        {% csrf_token %}
        {{ i.name }}
        <input name="id" type="hidden" value="{{ i.id }}" />
        <input name="q" type="text" value="{{ i.quantity }}" />
        <input type="submit" value="update" />
    </form>
{% endfor %}

I’m trying to offer a solution as simple as possible. You should know that django provides a lot of cool stuff, that can help your to solve your problem much efficiently, such as forms, modelforms, formsets…