Collection.uniqueKeys() - zuki/Dexie.js GitHub Wiki

collection.uniqueKeys(callback)

Promise

Retrieves an array of all unique indexes in the collection.

db.friends.orderBy('firstName').uniqueKeys(function (keysArray) {
    // keysArray is now all firstNames without duplicates even if having multiple
    // friends with same name.
});

If callback is omitted and operation succeeds, returned Promise will resolve with the result of the operation, calling any Promise.then() callback.

If callback is specified and operation succeeds, given callback will be called and the returned Promise will resolve with the return value of given callback.

If operation fails, returned promise will reject, calling any Promise.catch() callback.