saving html input tag to django models

Question

I have a form that contains input tags that are hidden, when i POST the form to the views and print, i see the values i need but the content is not saving to the database here is my html

<form method="POST" action="/selly/cart/" item_id="{{product.pk}}" enctype="multipart/form-data">
    {% csrf_token %}
    <h1 name="description">Description is : {{each_item.description}}</h1>
    <p><input type="hidden" name="description" value="{{each_item.description}}"></p>

    <span name="price">Price is : $ {{each_item.price}}/piece</span>
    <p><input type="hidden" name="price" value ="{{each_item.price}}"></p>

    <p>Quantity is : <input type="number" default="0" name="quantity"> piece ( {{each_item.item_remaining}} pieces available )</p>
    <br>
    <input type="submit" class="btn btn-primary" value="Add to Cart">

</form>

here is my views.py

from selly.models import Cart
def cart(request):
    if request.method == "POST":
        print "rp ", request.POST

        description = request.POST['description']
        print "Description is ", description

        price = request.POST['price']
        print "Price is ", price

        quantity = request.POST['quantity']
        print "Quantity is ", quantity

        items =  Cart.objects.get_or_create(client="client", description="description", price="price", quantity="quantity")
        print "ITEMS", items
    return render(request, 'selly/cart.html', {'items': items})

Here is the model.py

class Cart(models.Model):
    description = models.CharField(max_length = 100)
    price = models.DecimalField(max_digits=10, decimal_places=2)
    quantity = models.IntegerField()

    def __str__(self):
        return self.description

    def total(self):
        return self.price * self.quantity

Is there a way of making it save to the database i created called Cart

@Selcuk am getting [u"'price' value must be a decimal number."] as error — uche
– uche, Commented Mar 30, 2016 at 11:58
not entering any value for price, if you see it it is in hidden input field. The only input field that is visible is quantity — uche
– uche, Commented Mar 30, 2016 at 12:03

Withnail · Accepted Answer · 2016-03-30 12:07:53Z

I'm surprised you're not getting an error with that code - get_or_create returns a tuple, per the docs:

Returns a tuple of (object, created), where object is the retrieved or created object and created is a boolean specifying whether a new object was created.

So your line items = Cart.objects.get_or_create(client="client", description="description", price="price", quantity="quantity")

needs to be

items, created = = Cart.objects.get_or_create(client="client", description="description", price="price", quantity="quantity")

You'll also be able to interrogate that created variable, because if it's false, then it hasn't created a new object; if it hasn't created a new object, then all get_or_create is doing is returning the object already in the database.

You need to save the object manually if you're updating it.

This is because:

This is meant as a shortcut to boilerplatish code. For example:

try:
    obj = Person.objects.get(first_name='John', last_name='Lennon') 
except Person.DoesNotExist:
    obj = Person(first_name='John', last_name='Lennon', birthday=date(1940, 10, 9))
    obj.save()

Full details are on the docs page for get_or_create.

Also, your last line is wrong - you're assigning strings to the object, where you do price="price" - you actually want to do price=price, because you're assigning object.price=price, which is what you called the variable in the code above. I'd suggest maybe calling those variables 'incoming_price' or similar to avoid shadowing/confusion.

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