Is it possible to write a schema that validates more than one field at a time together?

anyone know of a x-www-form-urlencoded parser or x-www-form-urlencoded to edn converter?

idiomancy: I'm sure the ring libraries use one somehow

ahh, good place to look

I often feel like a macro

(in-parallel
  (external-api-call)
  (external-api-call)
  (external-api-call))

would be useful

am I missing something in core that's already this?

the way I usually do it is (run! deref [(future (api call)) (future (api call))])

@bfabry you might want to use go process to put and retrieve the result

@baptiste-from-paris I mean, I could make each of those future calls a go block but that's doesn't really gain me anything as far as I can tell

i really depends whether you need to deref it or not

base on you use case, it depends

I don't, but I do want to "block until all the background tasks are done"

which is what my run! example does

why do you need to block everything

?

because the next task I want to execute depends on all of those tasks having completed

ok

hey, is this the right channel to ask about namespace tools and cljc?

Yep

Say I have a vecor of maps, is there an easy way to run through each map and get the values of a specific key?

[{:a :c} {:a :b} {:a :z}]

to get [:c :b :z]

@urbanslug (mapv :a [{:a :c} {:a :b} {:a :z}])

Probably better to do it lazily though ^^ just in case.

Just wondering, is there anything in or for Leiningen, that can re-run your project whenever you save any of its sources? (like figwheel for clojurescript, nodemon for node.js, etc...)

I have this issue where loading my dev/user.clj is not enough to properly load the files it requires, I have to go and manually load some of the transitive dependencies, and it only errors at runtime...

I remember running into that in the past and never really figured out what the problem was, but my current project is plagued with those problems

@matan Some people use an editor hook, (e.g. for vim autocmd BufWrite *.clj Eval (reset)) but most people just map it to a short keybinding (I have a reset bound to ,rs for example)

@matan You probably need a state management in order to use these, I suggest looking into: - http://thinkrelevance.com/blog/2013/06/04/clojure-workflow-reloaded - https://github.com/stuartsierra/component - https://github.com/tolitius/mount - https://github.com/weavejester/reloaded.repl to help understand this pattern.

@jfntn That kinda sounds like the namespaces aren't being required, and are perhaps using fully-qualified namespaces in order to hack it into working?

@matan: depending on your application, there tend to be some tools around this too; for example for Ring apps there's the (wrap-reload) function: https://ring-clojure.github.io/ring/ring.middleware.reload.html

@timgilbert wrap-reload doesn't work with stateful things particularly well.

Well, I agree in principle but for less stateful things it's more handy than needing to restart your web server every time you make a code change...

@matan you can see an example app with restartable web server here: https://github.com/tolitius/stater/tree/master/smsio

to restart the server (only that component) for example, you'd do:

(mount/stop #'app.www/web-server)
(mount/start #'app.www/web-server)

Thanks a lot. I was actually, admittedly, looking for something easy rather than simple 🙂 as in the Scala world this was built into the equivalent of leiningen. I think I'll avoid the need for code changes and skip on this dev flow feature for now...

@matan It's not common to restart the entire server in Clojure, it's considered too slow of a process.

Yeah well I'm writing small services, not a server

E.g. data transformation services

If you're completely stateless clojure.tools.namespace.repl/refresh-all should work if you depend on tools.namespace

I don't suppose there's anyone else here crazy enough to try to interoperate jython and clojure?

running into a problem with jython not being able to figure out MRO for clojure.lang.PersistentVector's remove(), and was hoping to find someone else who has encountered the issue

i run jython and clojure together

haven’t encountered that issue though

can you describe the issue more?

it's actually pretty easy to duplicate. if you take a recent Jython standalone jar (grabbing 2.7.0 from their homepage), add clojure-1.8.0.jar to the classpath and run

java -cp jython-standalone-2.7.0.jar:clojure-1.8.0/clojure-1.8.0.jar org.python.util.jython -c "import clojure.lang.PersistentVector"

Traceback (most recent call last):
  File "<string>", line 1, in <module>
TypeError: Supertypes that share a modified attribute have an MRO conflict[attribute=remove, supertypes=[<type 'clojure.lang.ASeq'>, <type 'java.util.List'>], type=APersistentVector$RSeq]

yeah we have a shim that converts all our clojure-y stuff to jython-y stuff

ah

yeah, I can do that

i actually have it in a gist

https://gist.github.com/nickmbailey/3f11300e944e17d92edd6d42da785ab3

ooh, thanks

been meaning to put it in its own repo and ‘publish’ it but haven’t gotten around to it

i’m now vaguely remembering those MRO errors and i don’t think we ever came up with a different solution besides converting to jython objects first

something to do with multiple inheritance

Huh, this is surprising... I can't use a namespaced keyword which is the same as a function name? In other words:

(ns foo)

(defn bar [x y]
  {::bar (+ x y), ::other-stuff [...]})

(ns baz
  (:require [foo :as f]))

(defn get-bar []
  (::f/bar (f/bar 1 2)))

In practice, I can avoid this kind of overlap, but it's surprising that it's an issue.

How can I refer required vars/fns as something else? IE (require [core.x :refer [map :as x-map, reduce :as x-reduce]])

to avoid name collisions?

@josh.freckleton (:require [core.x :refer :all :rename {map x-map, reduce x-reduce}]) which is HIGHLY discouraged.

please use qualified imports instead.

Eg. (ns ... (:require [core.x :as x] ...)) ... x/foo

i think that last line is meant to be :require rather than :refer

unless i’m mistaken

Yep. Fixed.

@arrdem thanks!