mudar o exemplo dos carris das colunas
def change
change_column(:table_name, :column_name, :new_type)
end
como criar eixos de migração
rails g migration AddPartNumberToProducts
activerecord Adicionar coluna
class AddPartNumberToProducts < ActiveRecord::Migration[6.0]
def change
add_column :products, :part_number, :string
end
end