NestJs ParseEnumPipe 无法解析

Question

I am using the NestJs framework (love it by the way) and I want to check the incoming data so it conforms with an Enum in Typscript. So I have the following:

enum ProductAction {
  PURCHASE = 'PURCHASE',
}

@Patch('products/:uuid')
async patchProducts(
    @Param('uuid', ParseUUIDPipe) uuid: string,
    @Body('action', ParseEnumPipe) action: ProductAction,
  ) {

    switch(action) {

    ... code 
  }

The weird thing is that when I run this code, the first pipe gets compiled

2022-07-21 16:53:51 [error] [ExceptionHandler] Nest can't resolve dependencies of the ParseEnumPipe (?, Object). Please make sure that the argument Object at index [0] is available in the FriendsModule context.

What I am doing wrong?

Answer 1

您应该使用@Body('action', new ParseEnumPipe(ProductAction)) action: ProductAction因为枚举不会直接反映给 Nest 来读取其元数据，并且因为 Nest 试图弄清楚如何在真正注入Object时应该注入枚举。