I think it suffices to add @behaviour Access to your struct and implement the 3 @callbacks. If you only need a read access, it’s enough to merely implement
def fetch(struct, key) do
{:ok, Map.get(struct, key)}
end
in your struct (without needing to also add @behaviour Access to it). Though I think you then can’t get any compiler support via @impl Access annotation on the fetch/2 function. (Somebody correct me please if otherwise.)
