NestJs validate array in request body

Question

I'm trying insert validation into PUT request.

DTO's:

export class SettingUpdateDto implements ISettingUpdate {
    @IsInt()
    @IsPositive()
    id: number;

    @IsNotEmpty()
    @IsString()
    value: string;
}

export class SettingArrayUpdateDto {
    @Type(() => SettingUpdateDto)
    @ValidateNested({ each: true })
    items: SettingUpdateDto[];
}

Controller

@Put()
async updateItem(@Body() items: SettingArrayUpdateDto) {
    return await this.dataService.update(items);
}

Servise

async update(items: SettingArrayUpdateDto[]): Promise<Setting> {
    console.log("service data", items);
    return <Setting>{}; <SettingUpdateDto[]>items;
}

When i sent data, like this:

[
    {"id": -20, "value": {"name": "333"}},
    {"id": 21, "value": "2222222222222222"}
]

I received empty array. What am I doing wrong? Where is the mistake?

When i change settings in controller from SettingArrayUpdateDto to any, controller received original request data.

NestJs 6.10.14 version.

Eldari · Accepted Answer · 2020-12-17 23:40:09Z

27

To validate the array, create a dedicated class which contains a property that wraps the array, or use the ParseArrayPipe.

@Post()
createBulk(
  @Body(new ParseArrayPipe({ items: CreateUserDto }))
  createUserDtos: CreateUserDto[],
) {
  return 'This action adds new users';
}

answered Dec 17, 2020 at 23:40

Eldari

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2 Comments

arkus Over a year ago

ParseArrayPipe is from Nest.js v7, the author was looking for a solution in v6

Manuel Nucci Over a year ago

Does it work for you? I'm having problems in my project running latest version of NestJS

Jackie McDoniel · Accepted Answer · 2020-05-13 17:23:57Z

1

With the definition of the SettingArrayUpdateDto class, you need to send in a payload that matches it completely. That means your payload need to be

{
  "items": [
    {"id": -20, "value": {"name": "333"}},
    {"id": 21, "value": "2222222222222222"}
  ]
}

Because the SettingArrayUpdateDto has the items property which is of type SettingUpdateDto[].

answered May 13, 2020 at 17:23

Jackie McDoniel

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