Sometimes you can't see the wood for the trees I guess, I have it working 
with this trivial change:

(defn credential-fn [username]
  (update-in (read-user username) [:roles] read-string))

Still learning the basics...

On Sunday, 17 November 2013 17:04:27 UTC, wm.ma...@gmail.com wrote:
>
> Presumably when I read my user record from the database I need to 
> "de-stringify" the roles from the database column to an actual set for the 
> ":roles" rather than a string, so how do I do that for a string like this?
>
>      #{:my-app-ns/admin :my-app-ns/some-other-role} 
>

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