SDK
SDK Javascript v5.x
1

hsetnx #

Sets a field and its value in a hash, only if the field does not already exist.

[Redis documentation]


hsetnx(key, field, value, [options], [callback]) #

Arguments Type Description
key string Key identifier
field string Field name to insert or to update
value string Associated field value
options JSON Object Optional parameters
callback function Callback

Options #

Option Type Description Default
queuable boolean Make this request queuable or not true

Return Value #

Returns the MemoryStorage object to allow chaining.


Callback Response #

Returns a boolean specifying if the operation was successful or not.

Usage #

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// Using callbacks (NodeJS or Web Browser)
kuzzle.memoryStorage.hsetnx('key', 'field', 'value', function (err, status) {
  // callback called once the action has completed
});
// Using promises (NodeJS only)
kuzzle.memoryStorage.hsetnxPromise('key', 'field', 'value')
  .then(status => {
    // resolved once the action has completed
  });

Callback response:

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true