Page not found (404) Error on Django:

Question

the output we are looking at is to get title on page http://127.0.0.1:8000/courses/1/1/ and for further pages /2/ or /3/

courses/views.py

from django.shortcuts import get_object_or_404, render

from .models import Course, Step

def course_list(request):
    courses = Course.objects.all()
    return render(request, 'courses/course_list.html',
                  {'courses': courses})

def course_detail(request, pk):
    course = get_object_or_404(Course, pk=pk)
    return render(request, 'courses/course_detail.html',
                  {'course': course})

def step_detail(request, course_pk, step_pk):
    step = get_object_or_404(Step, course_id=course_pk, pk=step_pk)
    return render(request, 'courses/step_detail.html',
                  {'step': step})

our focus will be :

def step_detail(request, course_pk, step_pk):

    step = get_object_or_404(Step, course_id=course_pk, pk=step_pk)

    return render(request, 'courses/step_detail.html', {'step': step})

step_detail.html

{% extends "layout.html" %}

{% block title %} {{ step.title }} - {{ step.course.title }}{% endblock %}
     {% block content %}
     <article>
     <h2> {{step.course.title }} </h2>
         <h3> {{step.title }} </h3>
         {{ step.content|linebreaks }}
     </article>
     {% endblock %}

course/url.py

from django.conf.urls import url
from . import views

urlpatterns = [
    url(r'^$', views.course_list),
    url(r'(?P<course_pk>\d+)/(?P<step_pk>\d+)/$', views.step_detail),
    url(r'(?P<pk>\d+)/$', views.course_detail),
]

Answer 1

Actually, you are getting 404 error from here.

 step = get_object_or_404(Step, course_id=course_pk, pk=step_pk)

Here (get_object_or_404) you are saying that if unable to find a Step with given course_id and step_pk then give 404 error and it is doing the same.

You need to make sure that the entries exist. Your codes seem fine.