Mold - a tiny, zero-dependency parsing library for external payloads

[LostKobrakai]

@fuelen

And when it comes to actually saving that data, you end up converting those structs back to maps anyway, because Ecto’s cast won’t accept a foreign struct. So what was the point?

That’s a misunderstanding of what Ecto.Changeset.cast/4 is about though. cast is about taking in external data, which has not been typecast to internal datatypes. It’s the whole schema version of Ecto.Type.cast. When you got structs of your data you’re past that step. You’re no longer dealing with unknown input. You can just use Ecto.Changeset.change/2 or Ecto.Changeset.put_change/3 instead to skip any requirement of having a map or any typecasting – which is no longer necessary anyways.