class ActionController::ParameterMissing::Correction

def corrections
  if @error.param && @error.keys
    maybe_these = @error.keys
    maybe_these.sort_by { |n|
      DidYouMean::Jaro.distance(@error.param.to_s, n)
    }.reverse.first(4)
  else
    []
  end
end

def initialize(error)
  @error = error
end