How to dynamically type @ApiProperty({type: ()=>T}) | NestJS | Page 1

lunar pawn Sep 6, 2023, 10:27 PM

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How can I achieve this

`import { ApiProperty } from "@nestjs/swagger"

export class ApiResponseModel<T>{
status?: string
success: boolean
message: string
error?: boolean
@ApiProperty({ type:() => T })
data: T
}`

It currently throws 'T' only refers to a type, but is being used as a value here.ts(2693)

tall badger Sep 6, 2023, 10:44 PM

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You can’t, basically

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You would have to know exactly all the shapes for that data field

small frigate Sep 6, 2023, 10:46 PM

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Well, you technically can, through a function that returns a concrete class definition

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Or like this https://docs.nestjs.com/openapi/operations#advanced-generic-apiresponse

Documentation | NestJS - A progressive Node.js framework

Nest is a framework for building efficient, scalable Node.js server-side applications. It uses progressive JavaScript, is built with TypeScript and combines elements of OOP (Object Oriented Programming), FP (Functional Programming), and FRP (Functional Reactive Programming).

tall badger Sep 6, 2023, 10:48 PM

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I meant you can do it with types only

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But you can do this: https://aalonso.dev/blog/how-to-generate-generics-dtos-with-nestjsswagger-422g

aalonso.dev

How to generate Generics DTOs with nestjs/swagger

In this post I show you how to use TypeScript generics inside a Nest.js DTO in a way that allows Swagger to generate the correct OpenAPI schema definition.

lunar pawn Sep 7, 2023, 1:15 AM

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Thank you for the feedback. Unfortunately, I'm not able to get it working. Getting this error row new Error(A circular dependency has been detected (property key: "${key}"). Please, make sure that each side of a bidirectional relationships are using lazy resolvers ("type: () => ClassType").);
^
Error: A circular dependency has been detected (property key: "data"). Please, make sure that each side of a bidirectional relationships are using lazy resolvers ("type: () => ClassType").

lunar pawn Sep 7, 2023, 2:36 PM

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Somehow, it's working now. This is the final implementation.

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export const ApiResponseConfig = <TModel extends Type<any>>(model: TModel, status: number) =>{ return applyDecorators( ApiExtraModels(ApiResponseModel, model), ApiResponse({ status: status ?? 200, schema: { allOf: [ { $ref: getSchemaPath(ApiResponseModel) }, { properties: { data: { type: 'array', items: { $ref: getSchemaPath(model) }, }, }, }, ], }, }) )}

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`export class ApiResponseModel<T>{

// data?: T;

@ApiProperty()
status?: string

@ApiProperty()
success: boolean

@ApiProperty()
message: string

@ApiProperty()
error?: Boolean

}`

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@ApiResponseConfig(GetWalletModel, 201)

#How to dynamically type @ApiProperty({type: ()=>T})