zadd #

Adds the specified elements to the sorted set stored at key. If the key does not exist, it is created, holding an empty sorted set. If it already exists and does not hold a sorted set, an error is returned.

Scores are expressed as floating point numbers.

If a member to insert is already in the sorted set, its score is updated and the member is reinserted at the right position in the set.

[Redis documentation]

zadd(key, elements, [options], [callback]) #

Arguments	Type	Description
`key`	string	Key identifier
`elements`	array	List of JSON objects detailing the element to add to the sorted set. Properties: `score` (element's score, `double`), `member` (element's value, `string`)
`options`	JSON Object	Optional parameters
`callback`	function	Callback

Options #

Option	Type	Description	Default
`ch`	boolean	Instead of returning the number of added allements, return the total number of changes performed (including updates)	`false`
`incr`	boolean	Instead of adding elements, increment the existing member with the provided `score` value. Only one score+element pair can be specified if this option is set	`false`
`nx`	boolean	Only add new elements, do not update existing ones	`false`
`queuable`	boolean	Make this request queuable or not	`true`
`xx`	boolean	Never add new elements, update only exiting ones	`false`

Return Value #

Returns the MemoryStorage object to allow chaining.

Callback Response #

Returns an integer containing the number of elements added to the sorted set.

Usage #

var elements = [
  {'score': 1, 'member': 'foo'},
  {'score': 2, 'member': 'bar'},
  {'score': 3, 'member': 'baz'}
];
// Using callbacks (NodeJS or Web Browser)
kuzzle.memoryStorage.zadd('key', elements, function (err, count) {
  // callback called once the action has completed
});
// Using promises (NodeJS only)
kuzzle.memoryStorage.zaddPromise('key', elements)
  .then(count => {
    // resolved once the action has completed
  });

Callback response: