Is there a way to make a model behave like an object in loopback when typing?

One of the challenges I face is dealing with a loopback model that is often represented in raw JSON format. For example:

@model()
class SomeModel extends Entity {
  @property({ type: 'string' })
  id?: string;
}

In its raw JSON form, it would look like this:

interface IRawSomeModel {id?: string}

I'm wondering if there is a way to generate the IRawSomeModel interface programmatically?

One approach I've considered is combining the two interfaces, but it involves duplicating everything:

export interface IRawSomeModel {id?: string}

@model()
export class SomeModel extends Entity implements IRawSomeModel {
  @property({ type: 'string' })
  id?: string;
}

Ultimately, I am seeking a syntax similar to

RawObjectFormOfModel<SomeModel>
.

The goal is to write code like this without any errors:

const obj: RawObjectFormOfModel<SomeModel> = {}; // no error about missing class functions
obj.id = "test"

What is the most efficient method to obtain a raw object type representation of models?

Answer №1

Within the Entity class in lb4, there are two useful methods: toJSON() and toObject(). Both of these functions are designed to provide a plain object representation of the model class. These methods can be utilized for various purposes within your code.

As outlined in the dts definition file "model.d.ts":

/**
 * Serialize into a plain JSON object
 */
toJSON(): Object;
/**
 * Convert to a plain object as DTO
 */
toObject(options?: Options): Object;

Answer №2

To achieve this, the most effective method I have discovered is by creating an interface and then implementing it.

export interface IRawSomeModel {id?: string}

@model()
export class SomeModel extends Entity implements IRawSomeModel {
  @property({ type: 'string' })
  id?: string;
}

I am optimistic about finding a way to extract the decorator information and using it to automatically generate the interface.

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