Tips for merging DTO (Data Transfer Object) with non-DTO objects

I'm currently working on a new endpoint and I need to validate only two parameters (limit and offset) with the dto. The third parameter is not supposed to be checked.

My controller test code is not functioning as expected. When I try to use it, the endpoint returns an error message saying: "property startDate should not exist". How can I fix this issue and achieve the desired result? Are there any other alternatives I should consider in this scenario (besides creating a new dto)?

@Get()
methodName(
  @Query('startDate') startDate: Date,
  @Query() paginationDto: PaginationDto
) {
  return this.reviewsService.methodName(startDate, paginationDto);
}
typescriptnestjs

Answer №1

Instead of generating a new data transfer object

Your top choice would be to use with strict validation from the ValidationPipe (meaning not permitting unknown properties to the DTO). This is because @Query() represents req.query and @Query('startDate') stands for req.query['startDate']. Unless you create custom decorators that extract the values from the original location, like @PullFromQuery('startDate') which both grabs the data and alters the req.query, similar to this:

export const PullFromQuery = createParamDecorator((data: string, ctx: ExecutionContext) => {
  const req = ctx.switchToHttp().getRequest();
  if (data) {
    const retData = req.query[data];
    delete req.query[data];
    return retData;
  }
  return req.query;
})

However, I suggest refraining from modifying the req.query unless absolutely necessary and just go ahead with creating the second DTO.

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