Adding uuid's to a table in my rails app.

I am currently writing an application that will create a blank photo object with only a uuid and creation date as a skeleton for when an actually photo is added to the object. However I am having trouble finding any information about uuid's on the internet. If anyone can lead me in the right direction would be appreciated.

I have already set my primary-key to uuid.. but when I use rails console and create a new picture object the uuid is not generated instead the default shows.

irb(main):007:0> Picture.create (0.0ms) begin transaction (0.0ms) rollback transaction => #<Picture id: nil, created_at: nil, updated_at: nil, uuid: "uuid_generate_v4()">

ActiveRecord::Schema.define(version: 20170307152118) do

create_table "photo_booths", force: :cascade do |t| t.datetime "created_at", null: false t.datetime "updated_at", null: false t.string "booth_number" t.string "booth_location" t.integer "picture_count" end

create_table "pictures", id: nil, force: :cascade do |t| t.datetime "created_at", null: false t.datetime "updated_at", null: false t. "uuid", default: "uuid_generate_v4()", null: false <--------------- t.index ["id"], name: "sqlite_autoindex_pictures_1", unique: true end

end

module Photobooth class Application < Rails::Application # Settings in config/environments/* take precedence over those specified here. # Application configuration should go into files in config/initializers # -- all .rb files in that directory are automatically loaded. config.generators do |generator| generator.orm :active_record, primary_key_type: :uuid <---------------- end end end

I have been stuck for a few hours now.. but I am new and dont know where to go