I wish I could do something like this

gistfile1.rb

class User
  def fullname(first, second)
    "#{this.firstname} #{first} whatever"
  end

  def address(options)
    "#{street} #{options[:hash_key]}"
  end

  def smth(params)
    "*#{params}*"
  end
end

user.to_json(:methods => {
  :fullname => ["text parameter", some_var],
  :address => {:hash_key => :value},
  :smth => "one text parameter"
})