I have a model A:

{
  id: number,
  otherModelID: number|null,
  otherModel?: OtherModel,
  //  ... several other related models
}

If I make a query and include all models at once, it builds a really complex query with multiple joins and it takes seconds to execute:

let result = await A.findByPk(id, {
  include: [
    {
      model: OtherModel,
      as: 'otherModel'
    },
    // ...
  ],
})

I tried to get A first, and then call the virtual function to fetch each related model:

let result = await A.findByPk(id)
result.otherModel = result.getOtherModel()
// ...

It works, but when I try to call .toJSON() on model A, it doesn’t serialize the nested objects:

let result = await A.findByPk(id)
result.otherModel = result.getOtherModel()
console.log(result.otherModel) // { ... }

let resultPlain = result.toJSON()
console.log(resultPlain.otherModel) // undefined

The only way I could make it work is if I serialize A, then each of its related models, and then build the final plain object manually:

let result = await A.findByPk(id)
result.otherModel = result.getOtherModel()

let resultPlain = result.toJSON()

// repeat this for each related model
let otherModelPlain = result.otherModel.toJSON()
resultPlain.otherModel = otherModelPlain

Is there a better way to fetch a model and all related models as a single JSON object?