layout	title
default	Chapter 19

Updates

p. 429, The new_topic URL

The new_topic URL pattern should look like this:

urlpatterns = [
    --snip--
    # Page for adding a new topic.
    path('new_topic/', views.new_topic, name='new_topic'),
]

The new_topic() View Function

The reverse() function has been moved to a different module, so its import statement has changed:

from django.shortcuts import render
from django.http import HttpResponseRedirect
from django.urls import reverse

p. 433, The new_entry URL

The new_entry URL pattern should look like this:

urlpatterns = [
    --snip--
    # Page for adding a new entry.
    path('new_entry/<int:topic_id>/', views.new_entry, name='new_entry'),
]

p. 436, The edit_entry URL

The edit_entry URL pattern should look like this:

urlpatterns = [
    --snip--
    # Page for editing an entry.
    path('edit_entry/<int:entry_id>/', views.edit_entry, name='edit_entry'),
]

p. 439, Including the URLs from users

The line to include the URLs from the users app should look like this:

from django.urls import path, include
from django.contrib import admin

urlpatterns = [
    path('admin/', admin.site.urls),
    path('users/', include('users.urls')),
    path('', include('learning_logs.urls')),
]

As we saw when including the URLs from learning_logs, we write a simple string for the base of the URL, 'users/'. We leave out the namespace argument, because the namespace will be defined in the users/urls.py file.

p. 440, The Login Page

The users/urls.py file should look like this:

"""Defines url patterns for users."""

from django.urls import path
from django.contrib.auth.views import login

from . import views

app_name = 'users'
urlpatterns = [
    # Login page.
    path('login/', login, {'template_name': 'users/login.html'},
        name='login'),
]

Here we've defined the app_name variable, which defines the namespace for the URLs associated with the users app. We've also used the path() function to define the URL pattern for the login page.

p. 442, The logout URL

The logout URL pattern should look like this:

urlpatterns = [
    --snip--    
    # Logout page.
    path('logout/', views.logout_view, name='logout'),
]

p. 442-3, The logout_view() View Function

In users/views.py, the reverse() function needs to be imported from django.urls:

from django.urls import reverse

p. 444, The register URL

The register URL should look like this:

urlpatterns = [
    --snip--    
    # Registration page.
    path('register/', views.register, name='register'),
]

p. 449, Modifying the Topic Model

In learning_logs/models.py, the line that defines the foreign key relationship between topics and users should look like this:

owner = models.ForeignKey(User, on_delete=models.CASCADE)

This tells Django that when a user is deleted, all of the topics owned by that user should be deleted as well.