How Do I Use A Decimal Number In A Django URL Pattern?

Question

I\'d like to use a number with a decimal point in a Django URL pattern but I\'m not sure whether it\'s actually possible (I\'m not a regex expert).

Here\'s what I wa

Answer 1

It can be something like

urlpatterns = patterns('',
   (r'^item/value/(?P<value>\d+\.\d{2})/$', 'myapp.views.byvalue'),
   ... more urls
)

url should not start with slash.

in views you can have function:

def byvalue(request,value='0.99'):
    try:
        value = float(value)
    except:
        ...

Answer 2

Don't use »

url(r"^item/value/(?P<dollar>\d+\.\d{1,2})$", views.show_item, name="show-item"),

It will only match the URL patterns like /item/value/0.01, /item/value/12.2 etc.

It won't match URL patterns like /item/value/1.223, /item/value/1.2679 etc.

Better is to use »

url(r"^item/value/(?P<dollar>\d+\.\d+)$", views.show_item, name="show-item"),

It will match URL patterns like /item/value/0.01, /item/value/1.22, /item/value/10.223, /item/value/1.3 etc.

Finally you can design your views.py something like

This is just for an example.

# Make sure you have defined Item model (this is just an example)
# You use your own model name
from .models import Item 

def show_item(request, dollar):
    try:
        # Convert dollar(string) to dollar(float).
        # Which gets passed to show_item() if someone requests 
        # URL patterns like /item/value/0.01, /item/value/1.22 etc.
        dollar = float(dollar);

        # Fetch item from Database using its dollar value
        # You may use your own strategy (it's mine)
        item = Item.objects.get(dollar=dollar);

        # Make sure you have show_item.html.
        # Pass item to show_item.html (Django pawered page) so that it could be 
        # easily rendered using DTL (Django template language).
        return render(request, "show_item.html", {"item": item});
    except:
        # Make sure you have error.html page (In case if there's an error)
        return render(request, "error.html", {});

Answer 3

If the values to be accepted are only $0.01 or $0.05, the harto's pattern may be specified like this:

r"^/item/value/(\d\.\d{2})$"

Answer 4

I don't know about Django specifically, but this should match the URL:

r"^/item/value/(\d+\.\d+)$"