At the moment, I am utilizing NestJS for creating a restful API. However, I am currently facing an issue with the ValidationPipe. It seems to only be functioning properly within controller methods and not when used in service methods.
My goal is to implement different DTO classes (UserCreateDTO, StaffCreateDTO,...) based on the specific ROLE (admin, staff, user) associated with a particular route.
Pipes are only suitable for use in controllers and cannot be used with services. However, you can utilize the validate method from class-validator (alongside the plainToClass method from class-transformer) anywhere within your code:
const user = plainToClass(UserCreateDto, userRequestEntity);
const errors = await validate(user)
if (errors.length > 0) {
throw this.createError(errors);
}
Furthermore, there is no requirement to create distinct DTO classes for various roles. Simply leverage class-validator groups:
Assign each property in your DTO to one or more groups (= roles):
@Min(12, {groups: ['admin', 'staff']})
age: number;
@Length(2, 20, {groups: ['admin']})
name: string;
Then provide your group (roles) to plainToClass and validate.
// Provide your roles as groups
const groups = ['admin'];
// Convert to class with groups
const entityClass = plainToClass(EntityDto, entity, { groups })
// Validate with groups
const errors = await validate(entityClass, { groups });
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