db/migrate/20191007013357_update_pt_locales.rb


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class UpdatePtLocales < ActiveRecord::Migration[5.2]
  class User < ApplicationRecord
    # Dummy class, to make migration possible across version changes
  end

  disable_ddl_transaction!

  def up
    User.where(locale: 'pt').in_batches.update_all(locale: 'pt-PT')
  end

  def down
    User.where(locale: 'pt-PT').in_batches.update_all(locale: 'pt')
  end
end