How can Empty-Valued and Nullable Parameters such as query param metadata in a route such as GET /foo?metadata be documented in @nestjs/swagger? Using either readonly metadata?: null; or readonly metadata?: null; in a route @Query() dto class prompts the user in the generated swagger to enter a string value for the metadata property. This is confusing because no value is meant to be passed to this query param. Also trying @ApiProperty({ required: false, default: true, nullable: true }) readonly metadata?: boolean provides a dropdown but does not add the Send empty value checkbox that would be in swagger/oas3.
In Swagger/OAS3 this would be documented as:
parameters:
- in: query
name: metadata
schema:
type: boolean
allowEmptyValue: true
The key here would be the property allowEmptyValue. How can allowEmptyValue be defined in a TypeScript class representing a @Query() dto either through @nest/swagger decorators or class-validator decorators? It looks like BaseParemeterObject has the property allowEmptyValue: boolean, but how can that be used with an individual query dto param property?
Update:
I am able to use ApiQuery() decorator on a route in a @Controller() as follows to get the correct functionality:
@ApiQuery({ name: 'metadata', allowEmptyValue: true, type: Boolean, required: false })
But how could I get that same functionality in a a class DTO representing the Query()?
