Designate field Foo exclusive or field Bar as required in mongoose

Question

My schema has properties foo and bar. It is only allowed that one or the other exist when the document is saved. Not none, not both.

var schema = mongoose.Schema({
    foo: { type: ObjectId, ref: 'Foo' },
    bar: { type: ObjectId, ref: 'Bar'}
  });

Is there a way for me to mark these fields required in such an 'exclusive or' way, or do I need to implement this save logic myself?

Answer 1

Use mongoose Schema Pre-save event to test for existence of one or another before mongoose executes the actual save.

schema.pre('save', function (next) {
  // do stuff
  next();
});

http://mongoosejs.com/docs/middleware.html