Hello all, anyone worked with Promise in re-natal?

vikeri how do you work with AsyncStorage and Promise stuffs?

@fabrao We have a helper function that puts the results of a promise on a core.async channel:

(defn promise->chan
  "Takes a promise and a tag and returns a channel instead
  Puts on the channel: [tag error/nil result/nil]"
  [promise tag]
  (let [ch (async/chan)]
    (-> promise
        (.then #(async/put! ch [tag % nil]))
        (.catch #(async/put! ch [tag nil %])))
    ch))

But for quick stuff you can just thread it through .then and .catch like normal js-interop

I did it but no results, like this

(.then
       (.allDocs @local-database #js {:include_docs true :limit nil})
       #(js/console.log (.-rows %))
       )

or is that wrong what I´m doing?

*am I

I’d add a catch statement as well. But other than that it looks good. So there’s probably an error somewhere in your usage of the AsyncStorage API

Why do you reference AsyncStorage in an atom?

It´s just for testing, I´ll change after

Ok, don’t see the point of that though, even for testing.

(->
       (.allDocs @local-database #js {:include_docs true :limit nil})
       (.then #(js/console.log (.-rows %)))
       (.catch #(js/console.log %))) 

And you’re sure you have data in the storage?

I’d try setting and getting data instead

And also use AsyncStorage directly without the atom

so, are saying that if no data, no callback?

No idea, but I’d start with setting the data at least so that I know there’s something there

sorry, I made a mistake, the database is PouchDB with AsyncStorage adapter

Ok, haven’t used that unfortunately

so, how do you use promise->chan ?

tag you use for identify data?

Yep, in theory you can add another argument that is an existing channel

Then you’d need to know which data you got back

I see, I´ll try to use it

@fabrao Also, @pesterhazy did a great talk where he explores the different concurrency models in js/cljs: https://www.youtube.com/watch?v=rV1gTJ2wsZg

@vikeri many thanks, I´ll see it

:thumbsup: