Detecting optional fields

In this case, an optional decorator is not enough.

The first thing is that it cannot automatically detect optional fields just due to the @IsOptional() decorator. If you look at the route to create a product, you'll notice that the description field appears as required. Fixing this is quite simple, we just need to use the ? operator next to the field in the DTO. This is what the field would look like:

readonly description?: string;

We can then search for @IsOptional and do the same with all the fields marked with this decorator.

Commit - Marking optional fields for swagger