rails: uuid enabling

rails_uuid_enabling.md

enabling UUID on rails

$ rails g migration enable_uuid_extension

psql

postgres=# CREATE EXTENSION "uuid-ossp";

CREATE EXTENSION
postgres=# SELECT uuid_generate_v4();
           uuid_generate_v4
--------------------------------------
 f8c9ffd6-a234-4729-bd2a-68379df315fb
(1 row)

Migration to enable uuid

class EnableUuidExtension < ActiveRecord::Migration
  def change
  	enable_extension 'uuid-ossp'
  end
end

create model with uuid default

create_table :users, id: :uuid do |t|
      ## Database authenticatable
      t.string :email,              null: false, default: ""
      t.string :encrypted_password, null: false, default: ""

add uuid ot model

class AddUuidToBooks < ActiveRecord::Migration
  def change
    add_column :books, :uuid, :uuid, default: 'uuid_generate_v4()'
  end
end