active_record_disconnect_initializer.rb

# encoding: utf-8
# config/initializers/active_record_disconnect.rb

# Disconnect after intialization.
# Helpful for TorqueBox keeping connection for each
# runtime even when it is not used.
#
#    $ rails c
#    [1] > ActiveRecord::Base.connection_pool.connections.size
#    => 0
#    [2] > ActiveRecord::Base.connection.tables
#    => ["schema_migrations", "users"]
#    [3] > ActiveRecord::Base.connection_pool.connections.size
#    => 1

ActiveSupport.on_load(:after_initialize) do
  begin
    ActiveRecord::Base.connection_pool.disconnect!
  rescue ActiveRecord::ConnectionNotEstablished
  end
end