Method: Redis::Commands::SortedSets#zadd

Defined in:
lib/redis/commands/sorted_sets.rb

#zadd(key, *args, nx: nil, xx: nil, lt: nil, gt: nil, ch: nil, incr: nil) ⇒ Boolean, ...

Add one or more members to a sorted set, or update the score for members that already exist.

Examples:

Add a single ‘[score, member]` pair to a sorted set

redis.zadd("zset", 32.0, "member")

Add an array of ‘[score, member]` pairs to a sorted set

redis.zadd("zset", [[32.0, "a"], [64.0, "b"]])

Parameters:

  • key (String)
  • args ([Float, String], Array<[Float, String]>) —

    • a single ‘[score, member]` pair

    • an array of ‘[score, member]` pairs

  • options (Hash) —

    • ‘:xx => true`: Only update elements that already exist (never

    add elements)

    • ‘:nx => true`: Don’t update already existing elements (always

    add new elements)

    • ‘:lt => true`: Only update existing elements if the new score

    is less than the current score

    • ‘:gt => true`: Only update existing elements if the new score

    is greater than the current score

    • ‘:ch => true`: Modify the return value from the number of new

    elements added, to the total number of elements changed (CH is an abbreviation of changed); changed elements are new elements added and elements already existing for which the score was updated

    • ‘:incr => true`: When this option is specified ZADD acts like

    ZINCRBY; only one score-element pair can be specified in this mode

Returns:

  • (Boolean, Integer, Float) —

    • ‘Boolean` when a single pair is specified, holding whether or not it was

    added to the sorted set.

    • ‘Integer` when an array of pairs is specified, holding the number of

    pairs that were added to the sorted set.

    • ‘Float` when option :incr is specified, holding the score of the member

    after incrementing it.



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# File 'lib/redis/commands/sorted_sets.rb', line 53

def zadd(key, *args, nx: nil, xx: nil, lt: nil, gt: nil, ch: nil, incr: nil)
  command = [:zadd, key]
  command << "NX" if nx
  command << "XX" if xx
  command << "LT" if lt
  command << "GT" if gt
  command << "CH" if ch
  command << "INCR" if incr

  if args.size == 1 && args[0].is_a?(Array)
    members_to_add = args[0]
    return 0 if members_to_add.empty?

    # Variadic: return float if INCR, integer if !INCR
    send_command(command + members_to_add, &(incr ? Floatify : nil))
  elsif args.size == 2
    # Single pair: return float if INCR, boolean if !INCR
    send_command(command + args, &(incr ? Floatify : Boolify))
  else
    raise ArgumentError, "wrong number of arguments"
  end
end