I have no idea what you mean. What "sub-vector" do you mean? What is the "main" data?

Yes

Those were not "yes/no" questions...

I'm sorry. I edited the question to try make it more readable

The "sub-vector" is the vector in the key :data and the "main data is the :customer and :police info

OK. What does it have to do with re-frame though?

I'm using re-frame datatable library.

For the purpose of the question, it doesn't matter. The only thing that it tells me is that you want to end up having Hiccup that represents that table. So it's a question about transforming the data that you have into Hiccup. You need to reduce over the main vector of maps with "main" data and accumulate the rows. Each "main" vector would create N rows where N is the number of items in the "sub-vector", as you call it.

Something like this. Didn't check.

(letfn [(mk-row [item sub-item]
          [:tr
           [:td (:customer item)]
           [:td (:policy item)]
           [:td (:type sub-item)]
           [:td (:bruto-nr sub-item)]])]
  (reduce (fn [acc datum]
            (if (seq (:data datum))
              (-> (conj acc (mk-row datum (first (:data datum))))
                (into (map #(mk-row nil %) (rest (:data datum)))))
              acc))
    [] data))

Thanks, i'll try that!

There's a :dispatch-n effect, built into re-frame.

That might work, where are these built-in effects documented?

https://github.com/day8/re-frame/blob/master/docs/API.md

That works, thanks!