class Hash

# File lib/ext/hash.rb, line 10
def assert_required_keys(*required_keys)
  missing_keys = []
  for required_key in required_keys do
    # if they required key is an array that means the request must contain
    # one of the keys, but not more
    if required_key.is_a?(Array)
      if (keys-required_key).count < keys.count-1 # too many keys sent when they need only one
        missing_keys << "must choose one of either #{required_key.join(' or ')}"
      elsif (keys-required_key).count == keys.count # they didn't send any of the options
        missing_keys << required_key.join(" or ")
      end
    else
      missing_keys << required_key unless keys.include?(required_key)
    end
  end
  raise(ArgumentError, "Missing required key(s): #{missing_keys.join(", ")}") unless missing_keys.empty?
end

# File lib/ext/hash.rb, line 5
def assert_valid_keys(*valid_keys)
  unknown_keys = keys - [valid_keys].flatten
  raise(ArgumentError, "Unknown key(s): #{unknown_keys.join(", ")}") unless unknown_keys.empty?
end

# File lib/ext/hash.rb, line 28
def to_param(namespace = nil)
  collect do |key, value|
    value.to_query(namespace ? "#{namespace}[#{key}]" : key)
  end.sort * '&'
end