Get current timestamp in Ruby On Rails and use it to create a random alphanumeric string

# Get current time stamp

dateTime = Time.new

timestamp = dateTime.to_time.to_i

# This allows you to do String.random_alphanumeric(num) to get a random string that is num characters long. Useful for generating random identifier keys. ''This allows you to do String.random_alphanumeric(num) to get a random string that is num characters long. Useful for generating random identifier keys.

alphanumerics = [('0'..'9'),('A'..'Z'),('a'..'z'),(timestamp)].map {|range| range.to_a}.flatten

member_card_no = (0...16).map { alphanumerics[Kernel.rand(alphanumerics.size)] }.join

# Check generated alphanumeric string

puts member_card_no