active record notes - week 3 = active-record-intro

20170412active_record_notes

Create the Database
bundle exec rake db:create

Check Database Version
bundle exec rake db:version

Run the Test Suite
bundle exec rake spec

Run the Migrations
bundle exec rake db:migrate

Populate the Database with Seed Data
bundle exec rake db:migrate

Open and Use the Console
bundle exec rake console

Rollback the Database
bundle exec rake db:rollback

Drop the Database
bundle exec rake db:drop


class CreateDogs < ActiveRecord::Migration
-active record migration method inheritance

t.timestamps
=
(t= table columns)
t.integer :created_at
t.integer :updated at

name of the migration file begins with a timestamp in the format YYYYMMDDHHMMSS: 20140901164300

https://www.youtube.com/watch?v=cdgUhz2F0Mg - tunes Hans

bundle exec rspec spec/schema/people_table_spec.rb

bundle exec rake db:migrate

bundle exec rake generate:migration NAME=create_people

bundle exec rake generate:migration NAME=create_ratings

then ... I can run the migrate conversation whose skeleton I started
bundle exec rake db:migrate

bundle exec rake generate:migration NAME=create_ratings


rake db:rollback

migrate all bundle exec rake db:migrate