Final Countdown

final_countdown.md

Rails Fundamentals The Final Countdown

Move our original project:

• change to the home directory:

  • cd ~

• move course_catalog to cource_catalog_original:

  • mv course_catalog course_catalog_original

• check your work with:

  • ls

Update gems to the latest version:

Note: we're still in our home directory

• update installed gems
  • gem update

Create our new project:

• rails new course_catalog

Scaffold our domain:

Course
  - title, String
  - description, String (longer text)
  - prereqs, String

Instructor
  - first_name, String
  - last_name, String
  
Section
  - course, Course
  - instructors, Instructor
  - subtitle, String
  - location, String
  - area, String
  - units, String

Remember: Course --* Section Section --* Instructor

• scaffold the course:

  • bin/rails generate scaffold course title description:text prereqs

• scaffold the instructor:

  • bin/rails generate scaffold instructor first_name last_name

• scaffold the section

  • bin/rails generate scaffold section course:references subtitle location area units

• generate the join table for instructors and sections (it will be called instructors_sections)

  • bin/rails generate migration create_instructors_sections instructor:references section:references

• migrate our database tables

  • bin/rake db:migrate

Create our associations:

Course has many sections

• open app/models/course
• add has_many :sections

Section belongs to Course

• open app/models/section
• add belongs_to :course (scaffolding may have done this for you)

Section has and belongs to many instructors Instructor has and belongs to many sections

• open app/models/section

• add has_and_belongs_to_many :instructors

• open app/models/instructor

• add has_and_belongs_to_many :sections

Nest Section resources under Courses