002_create_states.rb

来自「基于ruby的进阶编程,大家可以对照教材<<Ruby on Rail」· RB 代码 · 共 12 行

class CreateStates < ActiveRecord::Migration
  def self.up
    create_table :states do |t|
      # t.column :name, :string
    end
  end

  def self.down
    drop_table :states
  end
end