zunionstore #

Computes the union of the provided sorted sets, and stores the result in a new sorted set.

Arguments #

zunionstore(dest, sources, [options]);

Arguments	Type	Description
`dest`	string	Target sorted set key
`sources`	string[]	List of sorted set keys to join
`options`	object	Optional query arguments

options #

The options arguments can contain the following option properties:

Property	Type (default)	Description
`aggregate`	string ("sum")	Specifies how members' scores are aggregated during the intersection. Allowed values: `min`, `max`, `sum`
`queuable`	boolean (true)	If true, queues the request during downtime, until connected to Kuzzle again
`weights`	integer[]	List of multiplication factors to apply to sources sets, before aggregation.

Resolve #

Resolves to the number of members added to the destination sorted set.

Usage #

try {
  await kuzzle.ms.zadd('sset1', [
    {member: 'foo', score: '42'},
    {member: 'bar', score: '4'}
  ]);
  await kuzzle.ms.zadd('sset2', [
    {member: 'foo', score: '-29'},
    {member: 'baz', score: '300'}
  ]);
  // Sums scores of joined values
  await kuzzle.ms.zunionstore('destsum', ['sset1', 'sset2']);
  // Stores the minimum possible scores of joined values
  await kuzzle.ms.zunionstore(
    'destmin',
    ['sset1', 'sset2'],
    {aggregate: 'min'}
  );
  // Prints:
  // [ { member: 'bar', score: 4 },
  //   { member: 'foo', score: 13 },
  //   { member: 'baz', score: 300 } ]
  console.log(await kuzzle.ms.zrange('destsum', 0, -1));
  // Prints:
  // [ { member: 'foo', score: -29 },
  //   { member: 'bar', score: 4 },
  //   { member: 'baz', score: 300 } ]
  console.log(await kuzzle.ms.zrange('destmin', 0, -1));
} catch (error) {
  console.error(error.message);
}

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