attendedEvents: [{ type: Schema.Types.ObjectId, ref: 'Event' }]
attendedEvents: [{ type: Schema.Types.ObjectId, ref: 'Event' }]
Ref is a special feature in mongoose that allows you to fill a field based on a specific schema. If you leave out the ref attribute in your "eventsAttended" field, you will only receive an objectID value without any connection to a schema.
For more information, check out the documentation here: https://mongoosejs.com/docs/api.html#schematype_SchemaType-ref
You can also refer to the guide here: https://mongoosejs.com/docs/populate.html
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