How to make invalid state irrepresentable?

[musjj]

I'm noticing that the models come with constructors like this:

hexarch/src/lib/domain/blog/models/author.rs

Lines 14 to 17 in d58a5c6

	impl Author {
	pub fn new(id: uuid::Uuid, name: AuthorName, email: EmailAddress) -> Self {
	Self { id, name, email }
	}

Which is later used by the db implementation:

hexarch/src/lib/outbound/sqlite.rs

Lines 72 to 76 in d58a5c6

	Ok(Author::new(
	author_id,
	req.name().clone(),
	req.email().clone(),
	))

But this means that consumers can construct potentially invalid Authors that aren't necessarily backed by the db.

Not sure if there's a good solution here, since you need to allow foreign modules to construct Author with the repository trait.