class Redis

def zunionstore(destination, keys, options = {})

Returns:
  • (Fixnum) - number of elements in the resulting sorted set

Parameters:
  • options (Hash) --
  • keys (Array) -- source keys
  • destination (String) -- destination key

Other tags:
    Example: Compute the union of `2*zsetA` with `1*zsetB`, summing their scores - 
def zunionstore(destination, keys, options = {})
  args = []
  weights = options[:weights]
  args.concat(["WEIGHTS"] + weights) if weights
  aggregate = options[:aggregate]
  args.concat(["AGGREGATE", aggregate]) if aggregate
  synchronize do |client|
    client.call([:zunionstore, destination, keys.size] + keys + args)
  end
end