Add part 3, use built-in user model

README.md

@@ -81,3 +81,11 @@ Create admin user:
 
 Edit `urlapp/admin.py` to allow modifications to the app.
 
+Part 3
+------
+
+Remove the `User` model and replace with that in `django.contrib.auth.models`.
+
+    python manage.py makemigrations urlapp
+    python manage.py migrate
+

urlapp/admin.py

@@ -2,7 +2,6 @@ from django.contrib import admin
 
 # Register your models here.
 
-from .models import User, Url
+from .models import Url
 
-admin.site.register(User)
 admin.site.register(Url)

urlapp/migrations/0002_auto_20150615_0853.py

+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+from django.conf import settings
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('urlapp', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='url',
+            name='user',
+            field=models.ForeignKey(to=settings.AUTH_USER_MODEL),
+        ),
+        migrations.DeleteModel(
+            name='User',
+        ),
+    ]

urlapp/models.py

+from django.contrib.auth.models import User
 from django.db import models
 
 # Create your models here.
 
-class User(models.Model):
-    username = models.CharField(max_length=32)
-    password = models.CharField(max_length=128)
-
-    def __unicode__(self):
-        return self.username
-
 class Url(models.Model):
     user = models.ForeignKey(User)
     target = models.CharField(max_length=256)