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You can tell to use any A compatible promise implemention like this: There are already many validation libraries out there today but most of them are very tightly coupled to a language or framework.
The first pull call will result in a atomic operation on the database, if pull is called repeatedly without saving the document, a $set operation is used on the complete array instead, overwriting possible changes that happened on the database in the meantime. Users provide an email and password, which gets saved to mongodb.
The second argument is a callback function that must called when you finish validating the value and passed either DEPRECATED. Mongoose 5.0 will use native promises by default (or bluebird,if native promises are not present) but stillsupport plugging in your own ES6-compatible promises library. is an object specifying all map Reduce options as well as the map and reduce functions.
Mongoose 5.0 will use native promises by default (or bluebird,if native promises are not present) but stillsupport plugging in your own ES6-compatible promises library. All options are delegated to the driver implementation.
To find out more, details are available here Passing a validator function that receives two arguments tells mongoose that the validator is an asynchronous validator.
The first argument passed to the validator function is the value being validated.