Code-Examples

With the current virus issues I forgot to publicize that my presentation about creating pleasant development environments was posted along with an example of Dockerizing an existing Rails application. You can find the slides for the talk here. Finally you can find a ready to use existing Rails template that uses Docker here.

Thanks to YEGRB for allowing me to present and to Will for his awesome editing skills. Also thank you to Corgibytes for feedback on draft presentation.

I gave the Introduction to ORMs for DBAs presentation at SQL Saturday 710 but it didn’t go as well as I would have liked (i.e. I had trouble getting my demo working).  Since the demo didn’t work live I thought I would show you what was supposed to happen during the demo.  You can find the slides I showed before the demo here.

The goal of this demo is create a basic website that tracks the games you and your friends play and display wins and losses on the home page.  I used a MacBook Pro for my presentation so you will see Mac screen shots.  That said the demo will also work on Windows.

A working example can be found here in the Saturday MP Examples GitHub.

First thing you need to do is create a basic Rails app as outlined in my previous post.  My setup is the same as creating Rails app: Ubuntu 18.04 LTS host using Docker to containerize my development environment.

Once your basic Rails app is up and running you can add React.  This example uses React-Rails.  First, you need to update the Docker file to install Node JS and Yarn.  Open up the DockerFile and change it so it looks like the below.

Back in the day Rails apps didn’t add foreign keys to database tables.  Believe it or not this was a feature not a bug.  The idea was that you shouldn’t “repeat” the relationship between you models in the code and in the database.  It wasn’t until Rails 4.2 that support was added for foreign keys.  

As you can probably guess I think this was a mistake.  If you have worked with a database without any foreign key constraints you quickly run into data integrity issues.  I don’t care how careful you think you are you will eventually screw up.  If not you then another person or application will corrupt your data.  Line items not attached to an order, address without customers, cats and dogs living together, etc.

I gave the Introduction to ORMs for DBAs presentation at SQL Saturday 710 but it didn’t go as well as I would have liked (i.e. I had trouble getting my demo working).  Since the demo didn’t work live I thought I would show you what was supposed to happen during the demo.  You can find the slides I showed before the demo here.

The goal of this demo is create a basic website that tracks the games you and your friends play and display wins and losses on the home page.  I used a MacBook Pro for my presentation so you will see Mac screen shots.  That said the demo will also work on Windows.