Rails Models

Models and Migrations

Create Model

rails g model SingularItemName

For minor changes and updates to a model

rails g migration NameOfChange

Add table cols and indexes

# /db/migrate/20200701_create_users.rb
def change
  # commands run in here
  create_table :users do |t|
    t.string :email, null: false
    t.boolean :marketing, null: false, default: true
    t.timestamps
  end

  # indexes, indiv line changes happen down here
  add_index :users, :email, unique: true
  # can access any existing table too
  add_column :cats, :color, :string
end

Run migrate which annotates all the things

rake db:migrate

Doesn’t quite work yet?

rails db:rollback - will undo the last migration

NB: won’t work in production env