Versioned migrations support in Rails 4.2

versioned_migrations.rb

# This file lives at config/initializers/versioned_migrations.rb
def supports_versioned_migrations?
  Rails::VERSION::MAJOR >= 5
end

if supports_versioned_migrations?
  ActiveSupport::Deprecation.warn(
    "Versioned migrations are supported in your Rails version, you can delete file: #{__FILE__}"
  )
  return
end

# Rails < 5 does not support versioned migrations and does not have the
# ActiveRecord::Migration.[version] method.
#
# Add the ActiveRecord::Migration.[version] method.
module VersionedMigrations
  def [](version)
    # Return the regular ActiveRecord::Migration class used before Rails 5
    ActiveRecord::Migration
  end
end

ActiveRecord::Migration.extend(VersionedMigrations)