class ActionDispatch::Journey::Formatter::MissingRoute

def initialize(constraints, missing_keys, unmatched_keys, routes, name)
  @constraints = constraints
  @missing_keys = missing_keys
  @unmatched_keys = unmatched_keys
  @routes = routes
  @name = name
end

def message
  message = +"No route matches #{Hash[constraints.sort_by { |k, v| k.to_s }].inspect}"
  message << ", missing required keys: #{missing_keys.sort.inspect}" if missing_keys && !missing_keys.empty?
  message << ", possible unmatched constraints: #{unmatched_keys.sort.inspect}" if unmatched_keys && !unmatched_keys.empty?
  message
end

def params
  path("unknown")
end

def path(method_name)
  raise ActionController::UrlGenerationError.new(message, routes, name, method_name)
end