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02-These Are Steps to Add an App to a Django Project

Create the App

An app is one section of a large website, but this project has only one app.

python manage.py startapp pages
# Creates code/djangoproject/pages

Add the App to the Project

In code/djangoproject/mysite/settings.py add 'pages', to INSTALLED_APPS list.

Add urls.py at app level

It's cleaner to keep urls separated by app. So in code/djangoproject/pages create urls.py. Then set up a skeleton in the new urls.py

from django.urls import path
urlpatterns = []

Create the Views

Every web page created in our app has to have a view so in pages/views.py:

from django.shortcuts import render
def home(request):
    return render(request, "home.html", {})
def about(request):
    return render(request, "about.html", {})
In each function, request is required, the html files are the names of the templates we're going to use. {} is a dictionary that we can use to pass data to the template

Add Templates

Add a subdirectory in pages called templates. Create home.html and about.html and add a header in each page. HOME PAGE and ABOUT PAGE.

Add the views to pages/urls.py

# import the views.py file so we can connect them to urls.
from . import views
# Then in usrpatterns list add a url for each view
path ('', views.home, name='home'),
path ('about/', views.about, name='about'),
# First is the page name that follows localhost:8000,
# Then the name of the function in views.py that we're attaching to that url,
# Then a name we can use for linking to this page.

So in project urls.py 

from django.urls import path, include
# then add to urlpatterns list
path('', include('pages.urls)),