Nest: Observable.throw from controller results in unhandled rejection promise

Created on 22 Jan 2018 · 5Comments · Source: nestjs/nest

Hi
I was using nest core @ 4.5.2, where by calls like following were not giving unhandled promise rejections.

@Controller("user")
export class UserController {
     @Get()
      find() {
          return this.userService.find .........
      }
}

In UserService

find() {
    This returns Observable.
   1. I check the permission and return boolean
   2. If permission is not present I throw exception
   3. In catch chain of observables, I log and create error event and return
       Observable.throw(....the error)
}

Above flow was working in 4.5.2 I was getting the error message in the api call response.
I updated today to 4.5.9 and code is broken now.

Basically.

@Get("/a")
    find() {
        return Observable.throw(new Error("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"));
    }

This has stopped working.

Error trace.

Unhandled Rejection at: Promise Promise {
  <rejected> Error: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    at UserController.findAll1 (/home/office/Data/src/project/dist/modules/user/UserController.js:27:46)
    at RouterExecutionContext.<anonymous> (/home/office/Data/src/project/node_modules/@nestjs/core/router/router-execution-context.js:51:33)
    at Generator.next (<anonymous>)
    at /home/office/Data/src/project/node_modules/@nestjs/core/router/router-execution-context.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (/home/office/Data/src/project/node_modules/@nestjs/core/router/router-execution-context.js:3:12)
    at handler (/home/office/Data/src/project/node_modules/@nestjs/core/router/router-execution-context.js:49:35)
    at InterceptorsConsumer.<anonymous> (/home/office/Data/src/project/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:36:31)
    at Generator.next (<anonymous>)
    at /home/office/Data/src/project/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (/home/office/Data/src/project/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:3:12)
    at InterceptorsConsumer.transformDeffered (/home/office/Data/src/project/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:35:16)
    at InterceptorsConsumer.<anonymous> (/home/office/Data/src/project/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:23:129)
    at Generator.next (<anonymous>)
    at /home/office/Data/src/project/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:7:71 } reason: Error: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
    at UserController.findAll1 (/home/office/Data/src/project/dist/modules/user/UserController.js:27:46)
    at RouterExecutionContext.<anonymous> (/home/office/Data/src/project/node_modules/@nestjs/core/router/router-execution-context.js:51:33)
    at Generator.next (<anonymous>)
    at /home/office/Data/src/project/node_modules/@nestjs/core/router/router-execution-context.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (/home/office/Data/src/project/node_modules/@nestjs/core/router/router-execution-context.js:3:12)
    at handler (/home/office/Data/src/project/node_modules/@nestjs/core/router/router-execution-context.js:49:35)
    at InterceptorsConsumer.<anonymous> (/home/office/Data/src/project/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:36:31)
    at Generator.next (<anonymous>)
    at /home/office/Data/src/project/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:7:71
    at new Promise (<anonymous>)
    at __awaiter (/home/office/Data/src/project/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:3:12)
    at InterceptorsConsumer.transformDeffered (/home/office/Data/src/project/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:35:16)
    at InterceptorsConsumer.<anonymous> (/home/office/Data/src/project/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:23:129)
    at Generator.next (<anonymous>)
    at /home/office/Data/src/project/node_modules/@nestjs/core/interceptors/interceptors-consumer.js:7:71

Please advice with new version I have to do something differently.

Let me know if more information is required.

type todo 💚

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