>From reading the doc at
https://github.com/Day8/re-frame/blob/master/docs/Subscribing-To-External-Data.md
it looks like the two "normal" patterns for getting data from external
sources are
(1) a subscription handler to trigger the request and return a path in the
app state, coupled with a callback that dispatches an event
to populate that path when the external service responds
(2) an event to trigger the request and another event that dispatches when
its callback runs, to save the response somewhere in app state
and then there's some sternly worded advice against putting this stuff into
view functions, with which I concur absolutely
My question is: why put the results into app-db at all? If you start with
the attitude that the external service is functional - i.e. it gives the
same answer every time given the same parameter, then what if you had a
subscription handler that returned a reaction with the results of the
external service call? I'm thinking something like this:
(defn get-search-results-from-server [term handler]
(ajax-request
{:method :get
:uri "/search"
:timeout 5000
:params {:q term :limit 25}
:format (ajax/url-request-format)
:response-format (ajax/json-response-format {:keywords? true})
:handler handler}))
(rf/reg-sub-raw
:search-result
(fn [db _]
(let [out (reagent/atom [])]
(ratom/run!
(let [term (rf/subscribe [:search-term])]
(when-not (str/blank? term)
(reset! out [])
(get-search-results-from-server
term
(fn [[ok? new-value]] (and ok? (reset! out new-value)))))))
(reaction out))))
- i.e. it's just another subscription handler that sits somewhere in the
middle of the signal graph and computes things, albeit that it computes
them very slowly.
It seems to work in my app (see
https://github.com/telent/epsilon/blob/master/src/epsilon/client.cljs#L217)
but my understanding of ratoms and reactions right now is very superficial,
so it's not beyond the bounds of possibility that it only works by
accident.
Thanks, by the way, for a very lovely bit of software and some exceedingly
good documentation around it
-dan
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