mpdairy/posh

A luxuriously simple and powerful way to make front-ends with DataScript and Reagent in Clojure.

Urban

@UrKr

when in reality it would only need to rerun when an entity is added or retracted

so in essence

I have a posh/q which gets all the eids I want

I then get the data for those eids with a bunch of posh/pulls

when that data gets edited however the expensive posh/q reruns

even though it's going to get the same list of eids because no entity was added or retracted

Christopher Small

@metasoarous

@UrKr There was some talk about bringing back manual pattern matching, which would let you specify that the q should only be rerun if a transaction looked like it was going to create a new entity that you'd want to match on. I don't know if that ever happened, but it would be worth looking into.

Urban

@UrKr

@metasoarous I think that would definitely be a good opt-in optimization. Wouldn't even be much of a pain to use.

javier abanses

@nrfm

Hi, is making posh self-host compatible in the roadmap?

Christopher Small

@metasoarous

@nrfm Actually, @bamarco is working on this right now. You mean being able to persist data client side right? (in local storage or whatever)

javier abanses

@nrfm

@metasoarous I mean, to be able to be used in a bootstrapped cljs environment like lumo or in my use case a browser based generative UI exploration tool using klipse/replumb + reagent + posh + datascript + spec . Day8/re-frame#325 is a pull request that achieves that for re-frame. Live coding UI in the browser is the ultimate addiction :)
I actually forked posh and started looking into this yesterday... It seems like the clj macros in base_plugin....What is the setup for development of the reagent parts? Reagent is not in the dependecy list... sorry ..maybe i am doing something wrong ...

Christopher Small

@metasoarous

Oh; of course. Sorry. I would love for that to be on the roadmap. I haven't worked much with bootstrapped cljs yet, aside from firing up a planck repl here and there. But I like the bootstrapped work, and see a lot of potential for embedded systems.

Live coding UI in the browser is the ultimate addition

True dat :-)

Reagent is not in the dependency list so that in theory it could be used with another front end framwork

It's been abstracted that way

So you have to require reagent separately if you want to use the reagent namespace

javier abanses

@nrfm

thanks! makes sense. Gonna play around with it and see what i come up with.

Christopher Small

@metasoarous

@nrfm Wonderful! Let us know if you have any questions!

javier abanses

@nrfm

@metasoarous My slow brain will certainly need some guidance. I haven't traveled much in macro land!
What branch should i work off ? I am getting a bunch of errors when compiling from the master branch? this one is the first that pops up, it seems aget is missing an argument.

Christopher Small

@metasoarous

It is worth checking with @alexandergunnarson about branch and stuff, since he was most recently working on things

javier abanses

@nrfm

@metasoarous thanks!
Hi @alexandergunnarson, I am getting a few errors when compiling from master first one is this one , could you give me some orientation on which branch is best to work off? thanks!

Christopher Small

@metasoarous

@nrfm Can you also tell us what macro you're looking at?

javier abanses

@nrfm

posh.lib.ratom/ aget* is the first one that cursive complains about in the master branch. It is being called with 1 argument in the cljs version as per the link above

javier abanses

@nrfm

@metasoarous cljs.core/aget inside aget is being called with 1 argument, not aget itself. the java .get method is getting both arguments passed to aget*

Christopher Small

@metasoarous

Ah; OK. Gotcha. Thanks.

I can't look at that right now, but that will help once I or someone else does have the time to

Keep us posted!

javier abanses

@nrfm

no worries, gonna see where i get with it. fixed a few things already. will report back

Christopher Small

@metasoarous

Good stuff! Cheers!

javier abanses

@nrfm

@metasoarous @alexandergunnarson got it compiling now.

Christopher Small

@metasoarous

Oh! Great! What was the deal?

javier abanses

@nrfm

that aget call missing an argument was breaking compilation. I just fixed that and compiles ok with some warnings that i am looking into now.
Use of undeclared Var posh.lib.ratom/array at line 202 src/posh/lib/ratom.cljc is an example.
they seem to originate from the if-cljs macro. investigating now, need some coffee to un-bend mi mind :)

Christopher Small

@metasoarous

Ah; I see. Good catch; Thank you!

Heh; macro recovery

javier abanses

@nrfm

@alexandergunnarson @metasoarous how do i go about running the tests? I have never run tests in cljc and when running lein test all the tests get run for clojure ok, but the ones in :cljs conditionals get ignored. thanks!

Christopher Small

@metasoarous

@nrfm I haven't done any testing with posh; I would check with @mpdairy. He hasn't been working with the library so much lately, but I believe he set up all the testing stuff.

javier abanses

@nrfm

@metasoarous thanks!

Brian Marco

@bamarco

Anybody that was interested in a rum plugin I wrote a potential roadmap here: mpdairy/posh#27

Matt Parker

@mpdairy

@nrfm Hey, I never set up any tests, @alexandergunnarson set up some for his ratom stuff. I don't think they cover much of posh though

Christopher Small

@metasoarous

@mpdairy Thanks!

Brian Marco

@bamarco

@mpdairy @metasoarous I'm trying to understand how the graph is related to the pull analysis. Could somebody explain the basic strategy for how the caching is done? I want to know if I can do the same thing with an onyx compute graph without state (or less state). Like if I have a tx-report can I decide which ratoms should update directly?

Christopher Small

@metasoarous

The graph structure has a cache of active queries, and on transaction, it goes through all the queries and runs a pattern match against the cached structure, and decides whether to rerun the actual query. I don't recall the details of how things are structured though.

If you do some pprints as things flow through, you should get a better sense though.

Brian Marco

@bamarco

That sounds like I could then. I want to stop all the listener business and subsume that into the compute graph. And I might be able to pass the cache as a value too if I can't drop it entirely. Not sure if it's worth the time at this phase.

javier abanses

@nrfm

@mpdairy thanks!

Baruch Berger

@bbss

I'm trying out posh, but getting an error when using pull:

plugin_base.cljc:77 Uncaught TypeError: Cannot read property 'call' of null
    at posh$plugin_base$get_db (plugin_base.cljc:77)
    at Function.posh.plugin_base.pull.cljs$core$IFn$_invoke$arity$5 (plugin_base.cljc:127)
    at posh$plugin_base$pull (plugin_base.cljc:123)
    at Function.posh.plugin_base.pull.cljs$core$IFn$_invoke$arity$4 (plugin_base.cljc:136)
    at G__10150__3 (core.cljs:4148)
    at G__10150 (core.cljs:4149)

maybe this warning I get during compilation has something to do with it:

WARNING: Wrong number of args (1) passed to posh.plugin-base/missing-pull-result at line 20 resources/public/js/compiled/devcards_out/posh/plugin_base.cljc
WARNING: Wrong number of args (1) passed to posh.plugin-base/missing-pull-result at line 22 resources/public/js/compiled/devcards_out/posh/plugin_base.cljc
WARNING: Wrong number of args (1) passed to posh.plugin-base/get-db at line 127 resources/public/js/compiled/devcards_out/posh/plugin_base.cljc

Brian Marco

@bamarco

@bbss Can you show your call to pull in your code and your ns?

Baruch Berger

@bbss

@bamarco sure, thanks

(ns korean.cljs.quick-word
  (:require
   [korean.cljs.training.training-component :refer [typing-field matched-text]]
   [datascript.core :as d]
   [reagent.core :refer [as-element] :as r]
   [posh.reagent :refer [pull q posh! transact!]]
   [cljs-react-material-ui.reagent :as ui]
   [cljs-react-material-ui.core :refer [get-mui-theme]]
   [cljs-react-material-ui.icons :as ic])
  (:require-macros
   [devcards.core :as dc :refer [defcard deftest]]))


(defn quick-word-component
  [state db]
  (let [current-typed (r/atom "")
        results (r/atom {})
        challenge (next-challenge (expression-couples-by-levels db))
        show-tip (r/atom false)
        [from to] (first challenge)
        from-text (:expression/korean (pull @db '[:expression/korean] from))
        to-text (:expression/english (pull @db '[:expression/english] to))]
    [:div ..etc..]))

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