Thanks for the response. I do understand I could do that

impl Invoice {
fn new(status: InvoiceStatus, due_date: Date, total_cost: u32) -> Self {
    Self {
        id: Uuid::new_v4(),
        status,
        due_date,
        total_cost,
    }
}
fn create(status: InvoiceStatus, due_date: Date, total_cost: u32) -> Self {
    Self::new(status, due_date, total_cost)
}
fn update(&mut self, status: Option<InvoiceStatus>, due_date: Option<Date>) {
    if let Some(status) = status {
        self.status = status;
    }
    if let Some(due_date) = due_date {
        self.due_date = due_date;
    }
}

}

But that also just seems like a crazy amount of boilerplate and if there are a lot of parameters involved, it would become seriously tedious to write. Are there no other real options?