class Rails::Application::Configuration

fundamentally incompatible with thread safety.
after boot, and disables reloading code on every request, as these are
multiple database connections. Also disables automatic dependency loading
Enable threaded mode. Allows concurrent requests to controller actions and

def threadsafe!
  self.preload_frameworks = true
  self.cache_classes = true
  self.dependency_loading = false
  self.allow_concurrency = true
  self
end