Django tutorial, HttpResponseRedirect, sending multiple arguments

[Ekberg Peter]

I know something like this has been asked before but I never seen any answer that I can understand or that works. But I am very new on Django so maybe I could have missed it. But there must be an easy answer to my question. I am following the tutorial for Django and at section 4 they use the httpresponseredirect to go to next page after posting a form.

return HttpResponseRedirect(reverse('polls:results', args=(question.id,)))

The views page function looks like this:

def detail(request, question_id):

My question is: How can I send more arguments than the question.id to the function?

Thx

[Andréas Kühne]

Hi Peter,

The thing is you need to handle this with your url files, your view function (or class) and your reverse call.

So for example:

urls.py

path('blog/<category:str>/<question_id:int>/', detail)

views.py:

def detail(request, category, question_id):

and finally the call to reverse:

reverse('polls:results', args=(category.slug, question.id, ))

Something like that.

All of this is connected - so you need to do all of it. However if you only want to get a url parameter, you can do so via the request object:

For example: 

blog/category_slug/23/?shoe_size=42

to get the shoe_sizer you get it in the view:

def detail(request, category, question_id):

     shoe_size = request.GET.get('shoe_size')

Hope this helps!

Regards,

Andréas

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[Ekberg Peter]

Hello Andréas and thank you for the answer. But unfortunately it doesn't seem to do what I want or I just don't get it.

What I really try to do is very simple, but I have been trying for two days now and feel I am close to give up on Django. Because if the simpliest and most common thing in webb application is this hard to understand than I must find something else. Passing arguments is the most common thng so I can't understand why Django doesn't offer any example. Anyway what I want to do is this.

I have this call:

return HttpResponseRedirect(reverse('bsapp:result', args=(question.id,)))

I suppose this must match This URL path:
path('<int:question_id>/result', views.result, name = 'result'),

That takes me to this function:
def detail(request, question_id):

From the reverse call I want to include some extra arguments that I can use in the detail page.
In your example it seems going in wrong order from what I am asking for. You have the reverse last, but it is the reverse function that runs first.
But I would appreciate very much if you can make an example from my code here.


Thanks
Peter

[Ekberg Peter]

This is what I had to do. Thanks to you I know how to think and fixed it. 


xx="EXTRA ARGUMENT"
 return HttpResponseRedirect(reverse('bsapp:result', args=(question.id, xx,)))


 path('<int:question_id>/<str:xx>/result/', views.result, name='result'),  


 def result(request, question_id, xx):

[Andréas Kühne]

Hi,

Sorry for mixing those things up - I was writing from the top of my head and not really paying that much attention perhaps :)

I would like to give you a few other pointers:

1. This is a bit biased but I would try to get away from function based views - because they tend to make you do a lot of code duplication (in my view - and I know I am opinionated here).

2. I am not really sure that you should use URL based things in your case - but if you want to fine - I would probably use query params instead (and get it off the request object instead). 

3. Django IS really simple - probably one of the easiest things to create but complicated and simple websites in :)

I would recommend that you look to a good tutorial to get started - the django girls tutorial is one of the best: https://tutorial.djangogirls.org/en/

Regards,

Andréas

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[Ekberg Peter]

Thank you for the feedback and advices. I will sure check out Django girls.

The mix of parameters was no problem, I figured that out. I was not sure though how to write the path. But now, at least I know how to send arguments and that's bothered me for a while. Now I am on the right track again. :-)

Peter

[Andréas Kühne]

Cool!

Keep learning - I think that django is probably one of the best COMPLETE frameworks there is - And now shortly with async support, it will be even better :)

The way you can quickly prototype something that later on can continue into production is one of Pythons and Djangos strengths.

Regards,

Andréas

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