Overview

• Preliminaries.
  • Admin.
  • Upcoming Work.
  • Extra Credit.
  • Questions.
• Reflections from classes 1 and 2.
• Activity: Building a toy app.
• Debrief.

Preliminaries

Admin

• I was having trouble running Rails on C9 this morning. Let's hope that things are working better. (My attempt to run Rails reasonably on MathLAN failed.)
• Attendance.
• Friday PSA.

Upcoming Work

• For Monday: Finish Chapter 2 of Hartl (including all construction).
  • Send me an invitation to your c9 repository.
• For Monday: Reading Journal
  • Message subject: CSC 321 Journal for Day 4 (Your Name)
  • What do you see as the advantages and disadvantages of using scaffolding?
  • Pick three files created by the scaffold command (ones that Hartl doesn't describe) and do your best to describe them concisely.
  • What is something you found particularly confusing or puzzling in the reading?
• For Monday: Do the setup for Chapter 3.
• For Wednesday (start early):
  • SaaSbook: Chapter 1 and sections 10.1-10.2, 7.1, 7.3-7.4

Good Things to Do

Academic

• CS Table Tuesday. (Facebook)
• CS Extras Thursday. (LaTeX)

Peer

• Track meet on February 6.
• Caucus on Monday night.

Questions

Question from classes 1 and 2

Why deploy to Heroku? Why not just use c9 for your work?

Um ... not sure.

It lets you identify issues that might occur when someone else tries to install your Web application.

c9, at least as we use it, is for simple development. It will not scale. It has very limited resources. Heroku is scalable, reliable, etc.

It's good practice to know how to deploy to a real cloud service.

"Everyone" deploys their Ruby apps to Heroku.

Learning to separate development from deployment.

Why didn't my app work on Heroku? It was complaning about SQLite or something.

Maybe something is messed up with SQLite.

There was a setup where we had to add a special gem for deployment. (Some Gems don't work on Heroku, particularly the SQL gem we use on cloud 9.) For c9, use SQLite. For Heroku, use PostgreSQL.

How many points will I lose by forgetting to do my journal on time?

Approximately 20 journal entries for 30% of your grade. Each is worth 1.5% of your grade. So do them late and only lose a little.

Activity: Building a toy app

• If you are using Github and don't have a keypair set up, you'll need to use a http-style Github address, rather than a git-style address.
• If you are using Github, you probably have to type git push -u origin master rather than whatever they had for Bitbucket.

Debrief

• It's worth the time to set up a keypair. It makes it much faster to push to your repo over the long term.