Using a Computed Properties to simplify relation

[rodolphonetto]

Hi guys, I've a relation where in the father I've the id and the child (details) I've the title. They are related using a hasOne, so I need to put a .with('details') to see the title, but I don't want to enter the details.title to get the title, there is a way to set a computed propertie in the model where it send the title directly?

[fnoquiq]

I didn't understand what you're trying to do. Which version are you using?

[rodolphonetto]

Hey, I'll try to explain it better

"selected_answers": [ { "id": 16, "form_id": 2, "answer": null, "answer_id": 1, "additional_answer": null, "details": { "id": 1, "form_id": 2, "title": "Opção 1", } } ]

selected_answers is a model. I want to set a computed to show the details.title in the root like that

"selected_answers": [ { "id": 16, "form_id": 2, "answer": null, "answer_id": 1, "additional_answer": null, "title": "Opção 1", } ]

Is it clear now? thank for you time :)

[fnoquiq]

I believe you can do this with hooks, but it will result in a loss of performance.

Hooks can be async while computed properties aren't. You can find more about hooks here.

import { hasOne, HasOne, computed, afterFind } from '@ioc:Adonis/Lucid/Orm'

@hasOne(() => Details)
public details: HasOne<typeof Details>

@computed()
public get title() {
  return this.details.title
}

@afterFind()
public static async afterFindHook(selectedAnswers: SelectedAnswers) {
  await selectedAnswers.preload('details')
}

Note: I can't tell you if this is the best way to do this

[McSneaky]

Hmm, I don't think there's something like that, but you can merge two objects together

const newObject = {
  ...objectOne,
  ...objectTwo // careful, if keys collide with object one, then it will overwrite those
}

Or use Object.assign()

[rodolphonetto]

I tried to explain it again in the answer above, maybe it is more clear on what I'm trying to do

[iammrsea]

I think there could be a workaround.
You could add a title computed property in your selected_answers model as follows:

@hasOne(()=>Details,{serializedAs: null))
public details: HasOne<typeof Details>

@computed()
public get title(){
 if(this.details){
 return this.details.title
}return null

Note, the serializeAs: null makes sure that details field is not returned with the selected_answer model

[rodolphonetto]

I'll try it, I'm using adonis 4.1 this would work there as well?

[fnoquiq]

No, the example is in the latest version (v5).

[rodolphonetto]

Before everything I wanna say thanks for the time you all are spending with me, thanks :)

I tried to do with v4.1 but it does not work what do u think I can do?

 static get computed() {
    return ['slug']
  }

  async getSlug({ format_id }) {
    const format = await FormFormat.findOrFail(format_id)
    console.log(format.slug)
    return format.slug
  }

the console.log is return the slug I need but the return on postman is like "slug": {},

[fnoquiq]

Can you put the controller code?

---

Try to call .toJSON()

const json = user.toJSON()
console.log(json.slug)