NestJS Swagger - How to declare multiselect enum field? - node.js

Question

I'm using #nestjs/swagger module in my application. I would like to declare multiselect enum field for one of my query parameters. I've read in the documentation that I can achieve this by combining enumand isArray properties. So I did something like:
class QueryParams {
#ApiModelProperty({
enum: ['test_status_1', 'test_status_2'],
isArray: true
})
status: string[]
}
I'm using this class to validate query. Unfortunately it's not working. So I decided to use #ApiImplicitQuery in my controller like this:
#ApiImplicitQuery({
name: 'status',
enum: ['test_status_1', 'test_status_2'],
isArray: true,
collectionFormat: 'csv'
})
This allowed my to declare multiselect enum, but there is a problem with the way those parameters are being added to the url. If I select multiple values I get:
?status=test_status_1&status=test_status2
I would like them to be send using csv format as I specified above. Right now it's using multi format. Is there a way to achieve this? I am doing something wrong?

Answer 1

I did something like this:
#ApiProperty({
isArray: true,
required: false,
enum: TestCaseFiltersStatuses,
})
#IsOptional()
#IsEnum(TestCaseFiltersStatuses, {each: true})
#IsArray()
#Transform((value) => {
if (typeof value == 'string') {
return value.split(',')
}
return value;
})
statuses?: TestCaseFiltersStatuses[];
.
.
.
async testCaseList(#Query(new ValidationPipe({transform: true})) query: TestCaseFiltersModel) {
...
}
that way this supports both ?params=1&params=2 and ?params=1,2