Transferring information to a deep-level interface

I am currently working on creating an object that aligns with my interface structure.

Success Story

export interface ServiceDataToDialog {
    id: number,
    service: string,
}
constructor(private _dialogRef: MatDialogRef<DialogServiceTabletAddRowComponent>, private _fb: FormBuilder, @Inject(MAT_DIALOG_DATA) public data: ServiceDataToDialog) {
  data.id = 1;
  this.mainForm.valueChanges.subscribe(value => {
    data.service = value.service;

However, I aim to have a nested object. This is the approach I took:

Struggle Zone

export interface ServiceDataToDialog {
    [id: number]: {
      service: string,
    }
}
constructor(private _dialogRef: MatDialogRef<DialogServiceTabletAddRowComponent>, private _fb: FormBuilder, @Inject(MAT_DIALOG_DATA) public data: ServiceDataToDialog) {
  data.id = 1;
  this.mainForm.valueChanges.subscribe(value => {
    data.id.service = value.service;

This results in the error message:

TS2339: Property 'id' does not exist on type 'ServiceDataToDialog'.

Desired Outcome

{
  1: {
    service: "My Service"
  }
}

Here's another attempt I made:

export interface ServiceDataToDialog {
    id: {
      service: string,
    }
}
constructor(private _dialogRef: MatDialogRef<DialogServiceTabletAddRowComponent>, private _fb: FormBuilder, @Inject(MAT_DIALOG_DATA) public data: ServiceDataToDialog) {
    data[1] = data.id;
    this.mainForm.valueChanges.subscribe(value => {
      data.service = value.service;

Yet, this leads to the following error:

TS7053: Element implicitly has an 'any' type because expression of type '1' can't be used to index type 'ServiceDataToDialog'. Property '1' does not exist on type 'ServiceDataToDialog'.

Can you identify what's causing the issue in my code?

Answer №1

When working with code, keep in mind that the ID is a string type. In the second example provided, there is an attempt to assign two values to both 'string' and 'object', which is not feasible.

To rectify this issue, the following adjustment can be made:

export interface ServiceDataToDialog {
 id: {
  id.string
  service: string,
 }
}

Additionally, make the necessary change in your code from:

data.id = 1;

to:

data.id.id = 1;

It would also benefit you to enhance your understanding of JavaScript objects and object destructuring.

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