4. ActiveRecordは便利ですね 1 class CreateUsers < ActiveRecord::Migration! 2 def change! 3 create_table :users do |t|! 4 t.string :name! 5 t.integer :age! 6 t.string :type! 7 ! 8 t.timestamps! 9 end! 10 end! 11 end 5. 14 15 16 17 18 19 20 21 22 23 24 ActiveRecord::Schema.define(version: 20131116064854) do! ! create_table "users", force: true do |t|! t.string "name"! t.integer "age"! t.string "type"! t.d