Authentication Lab

Intro

You just had the time of your life adding hand rolled auth to a Rails app.

But you know by now that this stuff doesn't stick without practice. So let's practice!

Here is your mission:

rails new <insert an app name here> -d postgresql -T
Generate a User model compatible with has_secure_password authentication. Hint: Don't forget a certain critical attribute...
Your choice on whether to use an email or username attribute to uniquely identify your user, however, as a user and a dev, I prefer email.
Include in your model any additional fields you want (first_name, age, etc.).
Do not generate any other models in this lab! You will only need the User model.
Code out your User model so that you can create new users in the Rails console and that:

Saving fails unless a unique email or username is provided. Test this by attempting to create the same user twice.
Saving fails if the password and password_confirmation don't match.
The saved user has a password_digest.

Provide a users#index action that displays all users in the database. Display each user's email or username.
On the index view, include a Sign Up link that displays a sign up form, creates the user in the database when submitted and returns to the index view.
On the index view, include a Log In link that displays a login form that logs in the user when submitted with valid credentials and returns to the index view.
On the index view, if a user IS logged in, don't show the Sign Up or Log In links. Show a Log Out link instead that when clicked, logs out the user shows the index view. This functionality should hold up if the page is refreshed (requires that the login be persisted in the session).

Require that passwords be at least 4 characters in length.
If, and only if, a user is logged in, display a delete link next to each email or username on the index view, except for the user that is currently logged in. Clicking the delete link should remove that user from the database and return to the index view.

If you complete this lab, you will in essence have an excellent starting point for your Project 2!