How to use an optional parameter in django URL

Question

I want solution for how Django URL work without any optional parameter or with optional parameter.

Here is the URL structure that I want:

path('<slug:category_slug>-comparison/<slug:brand_slug1>-vs-<slug:brand_slug2>-vs-<slug:brand_slug3>/',views.compare_brand)

Now I want something like 1st two slugs for comparison is compulsory so, as per the above URL

path('<slug:category_slug>-comparison/<slug:brand_slug1>-vs-<slug:brand_slug2>',views.compare_brand)

This is working fine because this are compulsory url parameter but I want to pass optional url from 2nd 'vs' to brand_slug3.

Can anyone help me in this?

ruddra · Accepted Answer · 2020-02-26 12:32:20Z

1

You can't do it like this in django urls.py. But you can pass a URL Query string to the view. For example, if you hit this url:

http://localhost:8000/Category1-comparison/Brand1-vs-Brand2/?vs=Brand3

Then you can catch the Brand3 value from request.GET. Like this:

def compare_brand(request, category_slug, brand_slug1, brand_slug2):
     brand_slug3 = request.GET.get('vs')

A better solution:

Maybe a better approach is to use URL query string all together. Because, in that way the url will be much cleaner. For example:

# url

path('/comparison/<slug:category_slug>/', compare_brand)

# view
def compare_brand(request, category_slug):
    brands = request.GET.getlist('brands')
    if len(brands) < 2:
        raise Exception('Need 2 brands atleast')

# browser url
http://localhost:8000/comparison/Cat1/?brands=Brand1,Brand2

From comments

You can create another url pointing to the same view

# url
path('<slug:category_slug>-comparison/<slug:brand_slug1>-vs-<slug:brand_slug2>-vs-<slug:brand_slug3>/',views.compare_brand),
path('<slug:category_slug>-comparison/<slug:brand_slug1>-vs-<slug:brand_slug2>/',views.compare_brand)

# view

def compare_brand(request, category_slug, brand_slug1, brand_slug2, brand_slug3=None):
    if brand_slug3:
       # do something

edited Feb 26, 2020 at 12:32

answered Feb 26, 2020 at 12:28

ruddra

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4 Comments

Sahil shaikh Over a year ago

No @ruddra actually I don't want like this its break SEO structure.

Sahil shaikh Over a year ago

what if I make another URL path for 3 brand_slug?

ruddra Over a year ago

@Sahilshaikh yep you can. Please see the #From comments section of the answer

Sahil shaikh Over a year ago

can you answer this question? stackoverflow.com/questions/60375404/…

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