Rails Tutorial using mysql

So I am reading this Rails Tutorial a second time, this time doing some off-roading.

[Edit 2015-12-15 - Reader "Zane" was kind enough to let me know the link was busted. Looks like a new edition was released and can be seen here.  Another tutorial can be viewed here.]

To start a project using mysql (instead of mysqlite), do this:

rails new app_name -d mysql

I am running OSX with a mysql image downloaded from Oracle.  When I tried to run this command:

rails generate scaffold User name:string email:string

The command failed with:

Library not loaded: libmysqlclient.18.dylib (LoadError)

Here is the fix:

sudo ln -s /usr/local/mysql/lib/libmysqlclient.18.dylib /usr/lib/libmysqlclient.18.dylib

The tutorial next has us run:

bundle exec rake db:migrate

Which results in this error:

rake aborted!

Access denied for user 'root'@'localhost' (using password: NO)

The fix is to edit your config/database.yml file:

Scroll down and replace update username: and password: values appropriately.

Re-running the command above yields:

rake aborted!

Unknown database 'app_name_development'

The fix is to create a new database:

rake db:create

Now the bundle exec command attempted above will work.

We can confirm this worked by interacting with the demo app and running the following commands:

mysql -u root -p

show databases;

use demo_app_development;

show tables;

select * from users;