async await callback is not a function

Question

I am using couchbase ottaman package:

let transaction = new Transaction({name:'Couch'});
    transaction.save((err) => {
        console.log(err);
    });

but can I use async/await with this package?

async create(){
        let transaction = new Transaction({name:'Couch'});
        try{
            await transaction.save();
        } catch (err) {
            console.log(err);
        }
    }

I am getting error:

node_modules\ottoman\lib\modelinstance.js:457
            callback(err);
            ^

TypeError: callback is not a function

score 3 · Accepted Answer · edited May 27 '17 at 15:00

3

Basically, you have to check if it returns promise - you can use it out of box. If not - you can promisify function you need. Something like this in result:

function saveModel(transaction) {
  return new Promise ((resolve, reject) => {
    transaction.save(err => {
      if (err) 
         reject(err);
      else
         resolve();
    });
  });
}

Such function can be used with async/await:

async create(){
  let transaction = new Transaction({name:'Couch'});
    try{
      await saveModel(transaction);
    } catch (err) {
      console.log(err);
    }
}

Another option is to view source files, but I'm too lazy to do it.

edited May 27 '17 at 15:00

trincot

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answered May 27 '17 at 14:47

Lazyexpert

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Ottoman does not return promise. – Alvin May 27 '17 at 14:56
@Alvin, no-one claims it does. Try this code, which *promisifies* the `transaction.save` method. Just make sure to put an `else` before `resolve()`. – trincot May 27 '17 at 14:59

async await callback is not a function

1 Answers1