async await callback is not a function

This question already has an answer here:

How do I convert an existing callback API to promises? 17 answers

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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.

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