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I have a mongoose schema like this suppose:- 

var mSchema = new Schema({
  name: { type: String, required: true}
});

and have been using this schema for a year and now i want to add gender to it like this :- 

var mSchema = new Schema({
  name: { type: String, required: true},
  gender: { type: String, default: 'Male' } 
});

whenever there will be an update request i want this gender to automatically set Male as default but i found that default don't set on update request. (Note: It's just an example not a real life scenario. i just want mongoose default work if field is not present or null)

Is there any way in which i can set default on the updation of document ?

Dhiresh Budhiraja
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    a possible solution is whenever you add a new field with a default, run updateMany query to initialize the field with the default value. – Nayan May 11 '20 at 06:49

1 Answers1

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If you are using a function like update(), then this is not directly possible as stated by this answer. Still, you can simply switch to a function like findOne() and use save(), which should do the same.

When upserting documents, you can also check out the setDefaultsOnInsert option: https://mongoosejs.com/docs/defaults.html#the-setdefaultsoninsert-option

const options = {
  // Create a document if one isn't found. Required
  // for `setDefaultsOnInsert`
  upsert: true,
  setDefaultsOnInsert: true
};

await XY.findOneAndUpdate(query, update, options);
BenSower
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