hey everyone, working on a querying problem. It's a fun one. I have a database from which I have to make a csv slurp. the columns would be: (1) name, (2) group, (3 & ...) interests interests is a nested map {:interests {:sports {:football :tennis} :brands {:gucci :java} } }. I would like to slurp out a doc, and for the respective name, I mark in columns (3 & ...) whenever the value of a particular interest is true.

an example slurp

an idea would be to to string and interpose (str name ", " group ", " some kind of loop here marking true for the interests)

What database, and what format are the columns?

(and you say "make a csv slurp" but do you mean produce a CSV file from the database?)

@ablazevix Is :interest's value always exactly two levels deep? And you want to "throw away" the middle level (`:sports`, :brands)?

@ablazevix for a two-level map like that:

user=> (def interests {:sports [:football :tennis] :brands [:gucci :java]})
#'user/interests
user=> (zipmap (mapcat val interests) (repeat true))
{:football true, :tennis true, :gucci true, :java true}
user=>

@ablazevix That would just be (zipmap (mapcat val interests) (repeat (:name row)))

The main issue you'll have here is that for the CSV file you'll need the union of all the interests across all rows so you know which columns to use as headers, and then you'd need to inflate each row to have blanks/`nil` for the "missing" columns for a given row..

Hi, I'm trying to use luminus +boot +hoplon and can't understand how to get it to work correctly with cider. Does anyone has an experience with it?

@ozanzal can you start a repl?

Well, running boot figwheel repl results in this error, however, a repl does seem to start and I can connect to it with Cider, but when I connect to it It seems broken, no autocompletion, and a lot of ClassNotFound exceptions when I try to evaluate functions

for example:

The first error is "Address already in use". The second error looks like you did (in-ns foo) before foo was loaded or required

the symptom being that it appears clojure.core is not loaded and it doesn't know what + is

Oops, looks like that was part of the problem, I needed to "(require 'user)"

Thank you!

you should be in user by default. what happens if you do neither require or in-ns?

Looks like what I was trying to do was needed for starting the app from within the repl, But I feel I need to do some homework, I wasn't requiring things properly, now I get it to work better, But I still need to understand figwheel better

I'd take care of the "address already in use", I guess you are somehow running two instances of a server

Also, the clojure repl is "mutable", meaning you can only call functions that have been defined (evaluated), and you can only reference namespaces that have been loaded

I normally eval the whole namespace (if it's compilable) and then evaluate each function that I want to (re)write so the repl gets the updated version

Thanks @mping,I'm trying to evaluate the projects core, and it looks like there is a problem locating env

Not sure if this is the correct place, so sorry if not! Does anyone have any resources to help advocate for clojure in their place of employment? A few teams are still on Java, others C# (mostly business dev and linear broadcast teams), but most are python, node.js, or golang.

Hello everyone, I have some functions that are kind of tricky to manually fix (they need to preprocess their input in some specific ways). I am working on a macro to aid in making the changes easier to implement. I've got a working prototype of what I want, but there is a tiny bit of syntax that I would like to improve. I've got this:

(defn fix-input
  [input]
  (println "fixing input")
  input)

(defmacro def-fixed
  [symbol attr-map body]
  `(def ~(with-meta symbol attr-map)
     (comp ~body fix-input)))

(def-fixed funky
  {:some-meta true}
  (fn [x] (inc x)))

(funky 5)
(meta #'funky)

(def-fixed funky
  {:some-meta true}
  [x] 
  (inc x))

(defmacro def-fixed
  [symbol attr-map arglist & body]
  `(def ~(with-meta symbol attr-map)
     (comp (fn ~arglist [email protected]) fix-input)))
#'user/def-fixed
(cmd)user=> (macroexpand '(def-fixed funky {:some-meta true} [x] (inc x)))
(def funky (clojure.core/comp (clojure.core/fn [x] (inc x)) user/fix-input))

@diego.vid.eco I think that's the specific input and expansion you want

exposing the metadata

user=> (binding [*print-meta* true] (pr-str (macroexpand '(def-fixed funky {:some-meta true} [x] (inc x)))))
"(def ^{:some-meta true} funky (clojure.core/comp (clojure.core/fn [x] ^{:line 1, :column 91} (inc x)) user/fix-input))"

awesome!

thanks a lot @noisesmith

the only tricks were using & foo in order to allow arbitrary forms in the emitted function, and explicitly binding then templating an arglist

the & isn't strictly needed, but makes it act like most other functions that allow a body argument

nice, thanks for the tips!