access path url parameter in view in Django

Question

I'm using Django 2.0

I have two modesl course and chapter

I want to pass course.pk in CreateView of chapter since chapter is related to course.

This is my urls.py

from django.urls import path

from courses.views import Courses, NewCourse, CourseView, NewChapter

app_name = 'course'
urlpatterns = [
    path('all', Courses.as_view(), name='list'),
    path('new', NewCourse.as_view(), name='new'),
    path('<pk>/detail', CourseView.as_view(), name='detail'),
    path('<course_id>/chapter/add', NewChapter.as_view(), name='new_chapter')
]

and NewChapter(CreateView)

class NewChapter(CreateView):
    template_name = 'courses/chapter/new_chapter.html'
    model = Chapter
    fields = ['name']

    def get_context_data(self, **kwargs):
        context = super(NewChapter, self).get_context_data(**kwargs)
        course = Course.objects.get(pk=kwargs['course_id'])
        if course is None:
            messages.error(self.request, 'Course not found')
            return reverse('course:list')

        return context

    def form_valid(self, form):
        form.instance.created_by = self.request.user
        form.instance.course = Course.objects.get(pk=self.kwargs['course_id'])
        form.save()

I also want to carry on validation if the Course with passed course_id exists or not. If it does not exists user will be redirected back otherwise he will be able to add chapter to it.

But it is giving error as

KeyError at /course/9080565f-76f4-480a-9446-10f88d1bdc8d/chapter/add

'course_id'

How to access parameters of path url in view?

Daniel Roseman · Accepted Answer · 2018-03-17 13:09:06Z

2

You need to use self.kwargs, not kwargs.

course = Course.objects.get(pk=self.kwargs['course_id'])

answered Mar 17, 2018 at 13:09

Daniel Roseman

602k68 gold badges910 silver badges923 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Anuj TBE Over a year ago

But, **kwargs is passed in get_context_data() so, it should work.

Daniel Roseman Over a year ago

Well, since it didn't work, you should ask why. And the answer is that those are completely different things; the kwargs passed to that method are just normal method keyword arguments, nothing at all to do with the arguments captured from the URL.

Collectives™ on Stack Overflow

access path url parameter in view in Django

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related