Using Rails Migration on different database than standard “production” or “development”

Question

I have a rails project running that defines the standard production:, :development and :test DB-connections in config/database.yml

In addition I have a quiz_developm

Answer 1

module ActiveRecord::ConnectionSwitch
  def on_connection(options)
    raise ArgumentError, "Got nil object instead of db config options :(" if options.nil?
    ActiveRecord::Base.establish_connection(options)
    yield
  ensure
    ActiveRecord::Base.establish_connection ActiveRecord::Base.configurations[Rails.env]
  end
end

ActiveRecord.send :extend, ActiveRecord::ConnectionSwitch

If you place this inside config/initializers/ you'll be able to do something like this:

ActiveRecord.on_connection ActiveRecord::Base.configurations['production'] do
  Widget.delete_all
end

This will delete all widgets on the production db and make sure the connection to the current Rails env's db is re-established after that.

If you just want to make it available in your migrations insead extend the ActiveRecord::Migration class.