Hi, Cerbos team I have a policy condition like this

expr: request.resource.attr.share_read_list.exists(t, t.id == request.principal.id)

and I would like to implement it and add a list of string in resouce attr in Rust, but it said AttrVal wasn't implemented for list, vec, or iter May you give me some example of this

Hi, you need to wrap the list into a ListVal tuple struct:

ListVal(["Alex"])

. It supports any type that implements

IntoIterator

#[derive(Debug, Clone)]
pub struct ListVal<V, I>(pub I)
where
    V: AttrVal,
    I: IntoIterator<Item = V>;

thx a lot