UUIDs for Rails ActiveRecords

rails_template_uuids.rb

# Configures Rails to use UUIDs instead of incremental integers.
# Limits Rails to run with postgresql only (even in development and test environments)

# postgresql adapter
gem "pg"

# default to use uuids in generators
initializer 'generators.rb', <<-CODE
  Rails.application.config.generators do |g|
    g.orm :active_record, primary_key_type: :uuid
  end
CODE

# enable extension in postgresql db
generate(:migration, 'EnableUUID')

enable_extension 'pgcrypto' unless extension_enabled?('pgcrypto')

Needs to be added to the EnableUUID migration to work.