In this assignment you will create the software required for a small library to manage its inventory. You have been provided the general application setup, tests, and templates.

Almost all of the material for this assignment should be familiar, but there is 1 new component. Similar to other assignments you will develop the required urls, views, and models. New to this assignment, you will use Django's messages framework to provide 1-time messages to your users.

To make sure your solution is correct, you can run the tests with the following command:

python3 manage.py test

documentation: https://docs.djangoproject.com/en/2.2/ref/contrib/messages/

The basic idea of the messages framework is to provide a tool for developers to render 1-time messages inside a template. It is commonly used for alerts to your user after redirecting. We will generally constrain our use of the framework to the following lines:

# import messages
from django.contrib import messages

# add a success message
messages.success(request, "You did it! Hooray!")

# add an error message
messages.error(request, "Oh no! Something bad happened!")

You will use this code inside your views to add messages. The provided templates are already set up to use the messages that your views will add.

from django.contrib import messages

def example_view(request):
    messages.error(request, "Fooey")
    return redirect("somewhere_else")

Book should have the following fields:

• title - the title of the book
• author - the name of the author of the book
• published - the date the book was published
• genre - the genre of the book
• in_stock - whether or not the book is currently in stock
• description - a description of the book

Transaction should have the following fields:

• datetime - the datetimewhen the transaction was created
• action - either "CHECKIN" for a return or "CHECKOUT" for a borrow
• book - the book being borrowed or returned

• "" should route to home
• book/<id>/borrow should route to borrow_book
• book/<id>/return should route to return_book

home renders book_list.html with all the books in the database using the context key "books".

borrow_book has two cases:

• If the book is in stock, the book is updated for in_stock to be False and a success message of Borrowed <title> by <author> is added. Also, a "CHECKOUT" Transaction should be created.
• if the book is not in stock, the an error message of <title> by <author> is unavailable is added

either way, the user is redirected to home

return_book has two cases:

• if the book is not in stock, the book is updated for in_stock to be True and a success message of Returned <title> by <author> is added. Also, a "CHECKIN" Transaction should be created.
• if the book is in stock, the an error message of <title> by <author> is already here is added

either way, the user is redirected to home