(in progress)

Generators in Rails.md

Make a Rails blog in 10 minutes

New Rails App with postgres

rails new APPNAME --database=postgresql

Why can't we use the default (sqlite) database?

• Heroku is a popular free hosting service.
• Heroku doesn’t use SQLite3, which is the default database in new Rails apps.
  • Why is SQLite incompatible with Heroku?
  • SQLite stores the database to a file in your db/ directory.
  • PGSQL

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### Scaffold post object

• This creates a blog post object with a title and a body.
• The scaffold will generate a lot of files - I've specified the ones I don't want.
• I can always create these files later if needed.

rails g scaffold post title:string text:text --no-assets —no-test-framework --no-helper —no-json

A scaffold will generate the following files:

• Models
• Views
• Controllers
• Tests
• Assets
• Helpers
• Routes
• Active Record Migration File

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Pretend Command

The -p pretend command shows me what files would be created without actually creating them.

rails g scaffold post title:string text:text --no-assets —no-test-framework --no-helper —no-json
 -p

Make model only

rails g model comment post_id:integer text:text

• Makes model, migration file, and test_unit (2 test files)

Database commands

rake db:migrate

Run Rails Server

rails s 

rails g controller comments create destroy #creates routes, views, helper, assets, scss, test_unit(2)

================================ To run migration : rails g migration create_posts -p *call with create_posts. not just posts *only creates the migration file, no helpers, models, etc.

================================ scaffold creates: AR — create_posts

Model post.rb

Test Unit For model, controller Resource resources :posts in ApplicationController create posts_controller

ERB For posts, index, edit, show, new, _form

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Resources & Advice:

• Dev Bootcamp recommendation for students: Use model/migration/controller generators only 1x to see the file structure, then only use migration generators for the rest of the phase.

• My personal recommendation: Use scaffold 4x first.

• Blog in less than 10 minutes: https://www.youtube.com/watch?v=JaL9ul17kx0 Good, "just do it" introduction to Rails.

• The difference between generate model vs. resource vs. scaffold http://www.korenlc.com/rails-generate-model-vs-resourse-vs-scaffold/

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bundle exec rake routes | grep edit_user_item
http://stackoverflow.com/questions/21708256/no-route-matches-missing-required-keys-id