class ActiveRecord::ConnectionAdapters::ConnectionHandler

def clear_reloadable_connections!(role = ActiveRecord::Base.current_role)

See ConnectionPool#clear_reloadable_connections! for details.

Clears the cache which maps classes. 
def clear_reloadable_connections!(role = ActiveRecord::Base.current_role)
  connection_pool_list(role).each(&:clear_reloadable_connections!)
end