In this assignment, you will build a web site that is roughly equivalent to
This web site is a classified ad web site. People can view ads without logging in and if they log in, they can create their own ads. It uses a social login that allows loging using github accounts.
You will build this application by borrowing parts and pieces from the code that runs
and combining them into a single application.
Make sure to get the latest version of dj4e-samples. If you have never checked it out on PythonAnywhere:
cd ~
git clone https://github.com/csev/dj4e-samplesIf you have already checked dj4e-samples on PythonAnywhere do:
workon django3
cd ~/dj4e-samples
git pull
pip install -r requirements.txtIn this section, we will break and then fix your settings.py and urls.py.
When this is done, the autos, cats, dogs, etc will stop working unless you
add them back to these two files. It is OK for these applications to be working.
The autograder will just look at /ads.
(1) Copy the settings.py and urls.py files and the entire
home folder from the dj4e-samples project:
cp ~/dj4e-samples/dj4e-samples/settings.py ~/django_projects/mysite/mysite
cp ~/dj4e-samples/dj4e-samples/urls.py ~/django_projects/mysite/mysite
cp -r ~/dj4e-samples/home/* ~/django_projects/mysite/home(2) Edit ~/dango_projects/mysite/mysite/settings.py and then delete
all the INSTALLED_APPLICATIONS after home. You also have to search
and replace dj4e-samples with mysite in a few places. Also set
the name of your application in the settings.py file:
# Used for a default title
APP_NAME = 'ChucksList'This shows up in default page titles and default page navigation.
(5) Edit your django_projects/mysite/mysite/urls.py and
remove all of the path() calls to the sample applications. Make
sure to keep the path() to include the home.urls. Also keep
the site and favicon rules in your urls.py.
(6) Edit the file django_projects/mysite/home/templates/home/main.html and put
this HTML in the file:
<html>
<head>
<title>{{ settings.APP_NAME }}</title>
</head>
<body>
<h1>Welcome to {{ settings.APP_NAME }}</h1>
<p>
Hello world.
</p>
</body>
</html>(7) At this point, you should be able to run:
python3 manage.py checkKeep running check until it does not find any errors.
If you restart your web application, there won't be many working urls. Try these two to see if you have the home code working properly:
https://your-account.pythonanywhere.com/
https://your-account.pythonanywhere.com/favicon.ico
https://your-account.pythonanywhere.com/accounts/loginLook at how pretty the login form looks :). Don't worry about social login yet. We will get to that later. Favicons are shown in the tabs in the browser. We will get to favicons later too :)
If you get an error like Could not import github_settings.py for social_django
when running manage.py or restarting your PythonAnywhere webapp,
don't worry - you will see this warning until you set up social login.
In this section, you will pull bits and pieces of the sample applications repository and pull them
into your ads application.
Important Note: If you find you have a problem saving files in the PythonAnywhere system using their browser-based editor, you might need to turn off your ad blocker for this site - weird but true.
(1) Create a new ads application within your mysite project:
cd django_projects/mysite
python3 manage.py startapp adsThe add the application to your mysite/mysite/settings.py and `mysite/mysite/urls.py'.
(2) Use this in your ads/model.py:
from django.db import models
from django.core.validators import MinLengthValidator
from django.contrib.auth.models import User
from django.conf import settings
class Ad(models.Model) :
title = models.CharField(
max_length=200,
validators=[MinLengthValidator(2, "Title must be greater than 2 characters")]
)
price = models.DecimalField(max_digits=7, decimal_places=2, null=True)
text = models.TextField()
owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
# Shows up in the admin list
def __str__(self):
return self.title(3) Copy the owner.py from myarts to your ads application. This is the one file you do not
have to change at all (thanks to object orientation :) ).
(4) The files admin.py, views.py, urls.py, and the templates folder will require significant
adaptation to be suitable for a classified
ad application and the above model. A big part of this assignment is to use the
view classes that are in owner.py and used in views.py. The new owner field should
not be shown to the user on the create and update forms, it should be automatically set
by the classes like OwnerCreateView in owner.py. If you see an "owner" drop down
in your create screen the program is not implemented correctly and will fail the autograder.
(5) Adapt the templates in myarts/templates/myarts as a starting point to create the needed
templates in ads/templates/ads.
(6) When you are implementing the update and delete views, make sure to follow the url patterns
for the update and delete operations. They should be of the form /ad/14/update
and /ad/14/delete. Something like the following should work in your urls.py:
from django.urls import path, reverse_lazy
from . import views
app_name='ads'
urlpatterns = [
path('', views.AdListView.as_view()),
path('ads', views.AdListView.as_view(), name='all'),
path('ad/<int:pk>', views.AdDetailView.as_view(), name='ad_detail'),
path('ad/create',
views.AdCreateView.as_view(success_url=reverse_lazy('ads:all')), name='ad_create'),
path('ad/<int:pk>/update',
views.AdUpdateView.as_view(success_url=reverse_lazy('ads:all')), name='ad_update'),
path('ad/<int:pk>/delete',
views.AdDeleteView.as_view(success_url=reverse_lazy('ads:all')), name='ad_delete'),
](7) As you build the application, use check periodically as you complete some of the code.
python3 manage.py check(8) Once your application is mostly complete and can pass the check
without error, add the new models to your migrations and database tables:
python3 manage.py makemigrations
python3 manage.py migrateIf you have errors, you might find the grep tool very helpful in figuring out where you might find your errors.
For example, lets say after you did all the editing, and went to the ads url and got this error:
NoReverseMatch at /ads
'myarts' is not a registered namespaceYou thought you fixed all the instances where the string "myarts" was in your code, but you must have missed one. You can manually look at every file individually or use the following command to let the computer do the searching:
cd ~/django_projects/mysite
grep -ri myarts *You might see output like this:
ads/templates/ads/ad_list.html:<a href="{% url 'login' %}?next={% url 'myarts:all' %}">Login</a>The grep program is searching for all the files in the current folder and in subfolders for any lines
in any file that have the string "myarts" in them and shows you the file name and the line within the file.
The grep command is the "Generalized Regular
Expression Parser" and is one of the most useful Linux commands to know.
The 'r' means 'recursive' and the 'i' means 'ignore case. The grep program will save you so much time :).
Next we will add the bootstrap navigation bar to the top of your application as shown in:
This top bar includes a 'Create Ad' navigation item and the login/logout navigation as well as the gravatar when the user logs in.
(1) Edit all four of the ads_ files in ads/templates/ads to change them so
they extend ads/base_menu.html. Change the first line of each file from:
{% extends "base_bootstrap.html" %}to be:
{% extends "base_menu.html" %}(2) Then create home/templates/base_menu.html with the following content:
{% extends "base_bootstrap.html" %}
{% block navbar %}
{% load app_tags %}
<nav class="navbar navbar-default navbar-inverse">
<div class="container-fluid">
<div class="navbar-header">
<a class="navbar-brand" href="/">{{ settings.APP_NAME }}</a>
</div>
<!-- https://stackoverflow.com/questions/22047251/django-dynamically-get-view-url-and-check-if-its-the-current-page -->
<ul class="nav navbar-nav">
{% url 'ads' as ads %}
<li {% if request.get_full_path == ads %}class="active"{% endif %}>
<a href="{% url 'ads:all' %}">Ads</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
{% if user.is_authenticated %}
<li>
<a href="{% url 'ads:ad_create' %}">Create Ad</a>
</li>
<li class="dropdown">
<a href="#" data-toggle="dropdown" class="dropdown-toggle">
<img style="width: 25px;" src="{{ user|gravatar:60 }}"/><b class="caret"></b>
</a>
<ul class="dropdown-menu">
<li><a href="{% url 'logout' %}?next={% url 'ads:all' %}">Logout</a></li>
</ul>
</li>
{% else %}
<li>
<a href="{% url 'login' %}?next={% url 'ads:all' %}">Login</a>
</li>
{% endif %}
</ul>
</div>
</nav>
{% endblock %}(3) Find the line in your base_bootstrap.html that looks like this:
<meta name="dj4e-code" content="99999999">and change the 9999999 to be "missing"
Make sure to check the autograder for additional markup requirements.
When you are done, you should see an 'Ads' menu on the left and a 'Create Ad' link on the right just like the sample implementation.
It is always a good idea to manually test your application before submitting it for grading. Here are a set of manual test steps:
(1) Make yourself a gravatar at https://en.gravatar.com/ - it is super easy and you will see your
avatar when you log in in your application and elsewhere with gravatar enabled apps. The gravatar can be
anything you like - it does not have to be a picture of you. The gravatar is associated an email address
so make sure to give an email address to the user you create with createsuperuser.
(2) Change your home/static/favicon.ico to a favicon of your own making. I made my favicon
at https://favicon.io/favicon-generator/ - it might not change instantly after you update the favicon
because they are cached extensively. Probably the best way to test is to go right to the favicon url
after you update the file and press 'Refresh' and/or switch browsers. Sometimes the browswer caching
is "too effective" on a favicon so to force a real reload to check if the new favicon is really being served
you can add a GET parameter tho the URL to forc it to be re-retrieved:
https://chucklist.dj4e.com/favicon.ico?x=42Change the x value to something else if you want to test over and over.
(3) Make social login work. Take a look at
github_settings-dist.py, copy it into
mysite/mysite/github_settings.py and go through the process on github to get your client ID and
secret. The documentation is in comments of the file. Also take a look at
dj4e-samples/urls.py and make sure that the "Switch to social login" code is correct
and at the end of your mysite/mysite/github_settings.py.
You can register two applications with github - one on localhost and one on PythonAnywhere. If you are
using github login on localhost - make sure that you register http://127.0.0.1:8000/ instead
of http://localhost:8000/ and use that in your browser to test your site. If you
use localhost, you probably will get the The redirect_uri MUST match the registered callback URL for this application. error message when you use social login.
This assignment is more vague than previous assignments - on purpose. The goal is to get closer to the development model for actual applications. You know what you want to build and start with a mostly blank slate. You look at sample code, reuse some code from stuff you built earlier, do some online searching and glue pieces of what you find together to make your application. Of course as you are gluing bits from various places together, they always break and you have to adjust things so they fit in your application.
So this is kind of like the real world - when you have to build your own first application for someone else.
It is not tricky on purpose. We want you to succeed in this assignment. But we do want you to do less cutting-and-pasting and more writing Django applications.