rails g migration ajouter des colonnes
$ rails generate migration AddDetailsToProducts part_number:string price:decimal
comment créer des rails de migration
rails g migration AddPartNumberToProducts
activerecord ajouter une colonne
class AddPartNumberToProducts < ActiveRecord::Migration[6.0]
def change
add_column :products, :part_number, :string
end
end
utilisation de SQL dans la migration des rails
def change
execute <<-SQL
UPDATE table1
SET column1 = "value"
SQL
end
migration de la base de données ruby on rails
rails db:migrate
rials db vers le bas
bin/rails db:migrate:down VERSION=YYYYMMDDHHMMSS