Query param validation against an enum | NestJS | Page 1

devout wolf Oct 19, 2023, 11:31 PM

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Hello! I'm not sure how to automatically validate queryparams against an enum to return a 400 if the value is not found in the enum. SpringBoot offers this feature.

fervent ledge Oct 20, 2023, 12:27 AM

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If you define a DTO for your query params, and use it like this:
@Params() params: ParamsDTO

You can use @IsEnum form class-validator

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Otherwise you can create a custom pipe that would check it for you.

devout wolf Oct 20, 2023, 12:43 AM

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Aha, good tip, thanks I'll try that :)

devout wolf Oct 20, 2023, 1:31 AM

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fervent ledge If you define a DTO for your query params, and use it like this: `@Params() para...

Where is @Params() from? did you mean @Query()?

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This is what I've got, but the validator doesn't seem to be doing much

spark lark Oct 20, 2023, 2:38 AM

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You have the ValidationPipe bound, right?

devout wolf Oct 20, 2023, 3:27 AM

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No I don't have a ValidationPipe. I had one before, but I didn't specifically bind it besides using a decorator, and I was declaring the parameter directly in the getCmaData() params rather than use a InitialDataParamsDto

spark lark Oct 20, 2023, 3:35 AM

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If you don't use the ValidationPipe then the class-validator decorators aren't gonna help you

devout wolf Oct 21, 2023, 2:29 AM

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Hmm I'll have to look into its usage, thanks :)

fervent ledge Oct 21, 2023, 6:34 AM

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I just realized you were talking about query params. In that case you need the @Query decorator

devout wolf Oct 21, 2023, 3:15 PM

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Yeah :P I presumed it worked the same

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Ok nice I just had to add @UsePipes(new ValidationPipe()) at the top of the file:

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Works, thank you!

devout wolf Oct 21, 2023, 7:31 PM

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!close

#Query param validation against an enum