method
extra_keys
rails latest stable - Class:
ActionController::Routing::Route
extra_keys(hash, recall = {})private
Determine which keys in the given hash are "extra". Extra keys are those that were not used to generate a particular route. The extra keys also do not include those recalled from the prior request, nor do they include any keys that were implied in the route (like a :controller that is required, but not explicitly used in the text of the route.)