Hard to say, the class cast exception will have more information in it
that could cast light on the issue. You also are using :id in one
variation, and :db/id in the other.
On 04/08/2016 05:46 PM, Daniel Ziltener wrote:
> Hi clj,
>
> I'm trying to do some simple core.logic stuff. My input is a vector of
> maps, which I turn into a source for core.logic using
> |
> (defn make-datamap-rel [datapile]
> (fn [q]
> (fn [a]
> (to-stream
> (map #(unify a % q) (flatten datapile))))))
> |
>
> Now I have written two variants for solving my problem. The first works
> flawlessly:
> |
> (defn-find-cat-and-tag-id [pile cat]
> (let [datamap-rel (make-datamap-rel pile)]
> (run*[q]
> (datamap-rel (partial-map {:id q :category cat}))
> )))
> |
>
> The second variant throws the ClassCastException:
> |
> (defn-find-cat-and-tag-id [pile cat]
> (let [datamap-rel (make-datamap-rel pile)]
> (run*[q]
> (fresh [qid]
> (datamap-rel (partial-map {:db/id qid :category cat}))
> (==q qid)
> ))))
> |
>
> I have no idea why this fails. It just doesn't make any sense. Any ideas?
>
> Best regards,
> zilti
>
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