Skip to content

Latest commit

 

History

History
64 lines (54 loc) · 1.46 KB

add_topics.md

File metadata and controls

64 lines (54 loc) · 1.46 KB
Raw

!SLIDE #let's add topics

  • what exactly do we mean by "add topics?"
  • rails "scaffolding" to generate some pages (and code)
  • set up database with a new table (migration)
  • review what we did

!SLIDE

adding topics

  • topic will have a title and a description
  • we will enable basic "CRUD" actions
    • Create - enter a new topic
    • Read - see everyone's topics
    • Update - change the topics you entered
    • Delete - remove your topics from the system

!SLIDE .

ruby script/generate scaffold topic title:string description:text
rake db:migrate

!SLIDE .

http://localhost:3000/topics

!SLIDE #What did we just do?

  • a model
    • create app/models/topic.rb
    • create db/migrate/20090611073227_create_topics.rb
  • 4 views
    • create app/views/topics/index.html.erb
    • create app/views/topics/show.html.erb
    • create app/views/topics/new.html.erb
    • create app/views/topics/edit.html.erb
  • a controller
    • create app/controllers/topics_controller.rb
    • route map.resources :topics

!SLIDE Architecture

!SLIDE

Model-View-Controller

  • Model
    • represents what is in the database
    • ActiveRecord
  • View
    • the model rendered as HTML
    • ActionView, erb
  • Controller
    • receives HTTP actions (GET, POST, PUT, DELETE)
    • decides what to do, typically rendering a view
    • ActionController

!SLIDE code .

git add .
git commit -m 'topic crud'
git push heroku master
heroku rake db:migrate