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Alwayspopulate() certain fields in your mongoose schemas

Read the docs here.

Note: population is a powerful feature, but it has limitations andhelps you get away with poor schema design. In particular, it is usuallybad MongoDB schema design to include arrays that grow without bound inyour documents. Do not include a constantly-growing array of ObjectIdsin your schema - your data will become unwieldy as the array grows andyou will eventually hit the16 MB document size limit.In general, think carefully when designing your schemas.

Themongoose-autopopulate module exposes a single function that you canpass toMongoose schema'splugin() function.

constschema=newmongoose.Schema({populatedField:{type:mongoose.Schema.Types.ObjectId,ref:'ForeignModel',// The below option tells this plugin to always call `populate()` on// `populatedField`autopopulate:true}});schema.plugin(require('mongoose-autopopulate'));

Only apply this plugin to top-level schemas. Don't apply this plugin to child schemas.

// Don't do `nestedSchema.plugin(require('mongoose-autopopulate'))`.// You only need to add mongoose-autopopulate to top-level schemas.constnestedSchema=mongoose.Schema({child:{type:Number,ref:'Child',autopopulate:true}});consttopSchema=mongoose.Schema({nested:nestedSchema});topSchema.plugin(require('mongoose-autopopulate'));