Held: ,

Back to Outline 08 - Test-Driven Development. On to Outline 10 - Advanced Rails.

Summary

We pause to consider a variety of issues that have accumulated throughout the past few weeks.

Related Pages

• https://github.com/saasbook/hw-bdd-tdd-cycle.

Overview

• Code smells.
• Designing databases.
• Big picture: Rails apps.
• Medium picture: Restful programming.
• TDD and BDD, revisited.

Administrivia

• You might enjoy reading this article: http://www.pgbovine.net/command-line-bullshittery.htm.
• The second half of our EdX course is at https://edge.edx.org/courses/course-v1:GrinnellCollege+CS321-1-F15b+2015_Fall/about
  • Dates and some assignments still have to be updated.
• For next week:
  • Reading: Chapter 5.
  • Programming: https://github.com/saasbook/hw-oracle-of-bacon
  • Partners tonight.
• There were a lot of problems on today's assignment, so we'll spend some time going through it today.

Code smells

• What are they?
• Why do we care?
• What are some useful smells to look for?
  • SOFA (or the inverse thereof - LMMC)
  • What are smells that you look for?
  • How do we make things smell better?
• At what level do we look at smells?

Designing databases

• We are dealing with relational databases.
• What's a relation (or relationship)?
• What kinds of relations are there?
  • We'll try to do examples of each.
• How can you more efficiently access some aspects of databases?

Big Picture: Rails Apps

What are the primary components of a Rails app, where do they go, and how do they communicate?

• Model: Objects that describe rows in a table in the database. Mostly automatic, although we write some methods. Live in app/models.
• Views: Show how to display certain kinds of pages. Live in app/views/app/page.html.haml.
• Controllers: Methods in the controller.
• Controller:

Medium Picture: Collaborating with Other Services

• The real Web is distributed.
• How do we achieve things like authentication?

TDD and BDD, revisited

From your perspective, what is the way that Fox and Patterson think that you should interact? Here's mine:

• BDD suggests a set of behaviors.
• Each behavior requires you to implement some underlying procedures.
• You use TDD to implement those procedures.

What problems did you encounter in trying to do the latest homework assignment?

Migrations

I found this guide particularly helpful: http://guides.rubyonrails.org/active_record_migrations.html.

Here's my migration

class AddDirectorToMovies < ActiveRecord::Migration
  def change
    add_column :movies, :director, :string
  end
end