db/migrate/20150221192553_create_users.rb


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class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users, id: :uuid, default: 'uuid_generate_v4()' do |t|
      t.string :username, null: false
      t.string :password_digest, null: false

      t.timestamps null: false
    end

    add_index :users, :username, unique: true
  end
end