Mongoose validation issue

Question

I currently have the following schema:

Schema({ _id: { type: Number, default: Math.floor(Date.now() / 1000) + 24 * 60 * 60 }, userID: { type: Number, require }, assignmentID: { type: Number, validate: { validator: function (v) { if (!v) { Promise.reject(false); } else { Assignment.findById(v, (assignmentErr, assignmentDoc) => { if(assignmentErr || !assignmentDoc){ Promise.reject(false); } else{ Promise.resolve(true); } }) } }, message: 'Invalid assignment ID.' } }

The issue I am facing is that I keep getting warnings in the console that I am not handling the rejected promises. Also the document is saved in the database even though the promise is rejected.

The way I save the new document is the following:

schema.save((err, savedDoc) => { }

How can I solve this issue or is there a better way to do complex validation like this?

sabbir · Accepted Answer · 2019-12-01 17:33:24Z

You can try following code:

 assignmentID: { type: Number, validate: { validator: function (v) { if (!v) { return Promise.reject(false); } return Assignment.findById(v) .then(assignmentDoc => { if( !assignmentDoc){ return Promise.reject(false); } else{ return Promise.resolve(true); } }) .catch(error => { return Promise.reject(error ); }) }, message: 'Invalid assignment ID.' } }

Update You can also try as like as given below:

 assignmentID: { type: Number, validate: { validator: function (v) { if (!v) { return Promise.reject(false); } return new Promise( (resolve, reject) => { Assignment.findById(v, (assignmentErr, assignmentDoc) => { if(assignmentErr || !assignmentDoc){ reject(false); } else{ resolve(true); } }) }); }, message: 'Invalid assignment ID.' } }

Thank you so much - it works! Could you please explain the difference between yours and mine as I am not sure I understand it fully?
As far what I can understand is that, you are resolve/reject, but never return it. I'm updating my answer which might be more understandable to you, thanks

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