Is it possible to pass data from exists? to handle-ok ?

[Hussein B.]

Hi,

For a resource as: /tree/:tree-id/leafs/:leaf-id

I'm using exists? to make sure that the leaf exists. Lets say that is not a cheap operation (DB or whatever).

What I would like to do is to pass the looked up leaf to handle-ok function so the handle-ok isn't going to do the lookup again.

Is it possible?

Thanks.

[Philipp Meier]

That's well possible and the main reason the context exists:

(defresource foo [tree leaf]

  :exists? (fn [ctx] (if-let [leaf (db-lookup tree leaf)] {::leaf leaf}))

  :handle-ok (fn [ctx] (::leaf ctx)))

If you return a map from a decision it's "deep-merged" with the context.

See http://clojure-liberator.github.io/liberator/doc/execution-model.html for the documentation

-billy.

[Hussein B.]

That is really cool.

Thanks for your help.