如何将ValidationPipe()和ParseIntPipe()应用于参数? [英] How to apply both ValidationPipe() and ParseIntPipe() to params?
问题描述
我正在尝试将ValidationPipe()
和ParseIntPipe()
应用于我的NestJs控制器中的参数.
I'm trying to apply both the ValidationPipe()
and ParseIntPipe()
to the params in my NestJs controller.
目的是仅将ParseIntPipe()
应用于@Param('id')
,但将ValidationPipe()
应用于CreateDataParams
和主体DTO中的所有参数.
The intention is to apply ParseIntPipe()
only on @Param('id')
but ValidationPipe()
for all params in CreateDataParams
and Body DTO.
但是,我似乎无法按照我想要的方式来应用两个管道.这是我所拥有的:
However, I can't seem to apply both pipes the way I wanted. Here's what I have:
@Post(':id')
@UsePipes(new ValidationPipe())
async create(
@Param('id', new ParseIntPipe()) id: number, //this doesn't work
@Param() params: CreateDataParams,
@Body() createDto: CreateDto
) {
// params.id
}
我尝试使用另一个@Param('id')
来应用ParseIntPipe()
变压器,但这不起作用.
I have tried having another @Param('id')
to apply the ParseIntPipe()
transformer but this doesn't work.
如何将ValidationPipe()
和ParseIntPipe()
都应用于参数?
How can I apply both ValidationPipe()
and ParseIntPipe()
to the params?
推荐答案
如果将ParseIntPipe
应用于id
参数,它将仅转换id
而不转换params
的属性id
,在这里它将保留为string
.
If you apply the ParseIntPipe
to the id
param, it will only transform id
but not the property id
of params
, here it will stay a string
.
相反,您可以使用class-transformer
将参数转换为number
:
Instead, you can use class-transformer
to transform your param to a number
:
import { Transform } from 'class-transformer';
export class CreateDataParams {
@Transform(id => parseInt(id), {toClassOnly: true})
id: number;
}
然后将ValidationPipe
与选项transform: true
一起使用:
Then you use the ValidationPipe
with the option transform: true
:
@Post(':id')
@UsePipes(new ValidationPipe({transform: true}))
async create(
@Param() params: CreateDataParams,
@Body() createDto: CreateDto
) {
// params.id
}
不过请注意,这是不安全的,因为parseInt('5abc010')
是5
.因此,您可能需要在转换函数中进行其他检查.
Note though, that this is unsafe because e.g. parseInt('5abc010')
is 5
. So you might want to do additional checks in your transformation function.
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