How to do inner joining in MongoDB?

Question

Is it possible to do SQL inner joins kind of stuff in MongoDB , well i know there is

$lookup

attribute in aggregation pipeline and

Answer 1

Will this help

const RolesSchema = new Schema({
  ....

});
const Roles = mongoose.model('Roles', RolesSchema);


const UserSchema = new Schema({
  ...

  roles: [{ type: mongoose.Schema.Types.ObjectId, ref: "Roles" }]
});

using the populate on userschema you can also reduce the redundancy