Mongoose error on promise with save?

Question

When i try to get promise back with save operation on instance of model. i get error: undefined is not a function

instance.save().exec().then(..)

However, if i try to get promise with model like this, then it works.

model.find(..).exec().then(..)

Is there no way to get promise for save action. Currently i just pass callback to save function. However, for the sake of consistency i'd like to do all db operations in the same manner.

Answer 1

Model#save returns a promise, so you should skip the .exec():

instance.save().then(...);

Answer 2

Something like this?

let mongooseInstance = new MongooseInstance(Obj);
return mongooseInstance
  .save()
  .then(savedObj => {
    if (savedObj) {
      savedObj.someProperty = null;
      success.data = savedObj;
      return Promise.resolve(success);
    } else {
      return Promise.reject(error);
    }
  });

and maybe with a catch?

mongooseInstance
  .save()
  .then(saved => console.log("saved", saved))
  .catch(err => console.log("err while saving", err));