save_changes is only available for types that implement Copy

[White-Oak]

As far as I can see, save_changes is only available for types that implement Copy: T: Copy + AsChangeset<Target=T::Table> + IntoUpdateTarget. But for most models that would not be the case, since String, which is arguably one of the most common fields in models, does not implement Copy.

Is it possible to ease the requirements for SaveChangesDsl?

[sgrif]

SaveChangesDsl (along with AsChangeset, IntoUpdateTarget, and Identifiable) is implemented on a reference to your struct, not the struct itself. References always implement Copy. If save_changes isn't present, you're probably missing either #[derive(AsChangeset)] or #[derive(Identifiable)]