Generate UUID v7

Generate a Unix timestamp-based UUID v7 with millisecond precision, ideal for database primary keys.

Code

Utilities

require 'securerandom'
timestamp = (Time.now.to_f * 1000).to_i
rand_a = SecureRandom.random_number(0xfff)
rand_b = SecureRandom.random_number(2**62)
return '%08x-%04x-7%03x-%04x-%012x' % [
  timestamp >> 16,
  timestamp & 0xffff,
  rand_a,
  (rand_b >> 48) | 0x8000,
  rand_b & 0xffffffffffff
]

Server

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Generate UUID v6

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Array Difference

Find elements in the first array that are not present in the second array.