Create App View

[courses/views.py]

from django.http import HttpResponse
from django.shortcuts import render

from .models import Course 


def course_list(request):
  courses = Course.objects.all()
  output = ', '.join([str(course) for course in courses])
  return HttpResponse(output)

.models
. means look for the models module in the current directory

join([str(course) for course in courses])
Join expects a list of strings. Thus, we needed to turn course types into strings before printing.

Add App URLs

[courses/urls.py]

from django.conf.urls import url

from . import views

urlpatterns = [
    url(r'^$', views.course_list), 
]

Now, if you test the homepage, you’ll still see the “Hello, world!” line from last time.
That’s because we need to add the app’s URL list to the project’s URL list.

python manage.py runserver 0.0.0.0:8000

Add App URLs to Project URLs

[urls .py] (i.e. learning_site/urls.py)

...
urlpatterns = [
    url(r'^courses/', include('courses.urls')),
    url(r'^admin/', include('admin.site.urls')),
    url(r'^$', views.hello_world),
]
...

include()
A function that lets us include a set of URL patterns from somewhere else.
In our case, URL patterns from our Courses app.

'courses.urls'
A string. Django turns this string into an import path, which lets it find the URL patterns.