Would there be a way of combining this approach with the use of
preconditions in clojure?
E.g.
(defn create-user [user]
{:pre validation/user? user}
(db/insert! user))
On Wednesday, March 20, 2013 1:00:23 PM UTC-4, Marko Topolnik wrote:
>
> On Wednesday, March 20, 2013 5:51:59 PM UTC+1, Julien Dreux wrote:
>
>> Thank you all for your answers,
>>
>> I like Marko's approach.
>>
>> What I had in mind, related to OP's post, would be a middleware that does
>>> (binding [*validation-failures* []]
>>> (handler req)
>>> (do-something-about *validation-failures*))
>>> There would be a global function, such as *add-failure*, which would *
>>> conj* a new failure to the vector.
>>
>>
>> Being a Clojure novice I had no idea that this was a possibility and it
>> sounds like a better approach than exception throwing. Is this something
>> similar to the way lib-noir does it?
>> https://github.com/noir-clojure/lib-noir/blob/master/src/noir/validation.cljsee
>> the set-error fn.
>>
>
> Hm, that's really it, quite precisely; I wasn't aware of it. Seeing it now
> I realize that in my example I made the mistake of forgetting to wrap the
> failure vector inside an atom. Without that it won't work.
>
> -marko
>
>
>
>
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