I’m using ns-unmap for easier code reload of defmulti/defmethod within REPL, but it caused exception when invoking uberjar standalone jar, any way I can detect if current environment is dev or not in order to skip those ns-unmap?

Use (def multimethod nil) instead

@hiredman thx for your advise, although it works as if ns-unmap, packaging with uberjar still throw exception, I guess aot compilation don’t allow variable re-binding…

Don't use ns-unmap at all

Replace it with def the multimethod var to nil first

ok got it, but yet to find a way to prevent standalone jar exception

it turns out simply define the dispatch function separately did solve my issue!! 🎉

I would not be super surprised if you had some lurking namespaces issue with your project

Maybe not (trying to remember where and in what order the bytecode to look up vars is emitted)

Hey, I have a date format as "2017-02-14T12:00:00.000+4:00", I need it to convert so that it is in format YYYY-MM-DD, so basically get rid of time and timezone stuff. I used clj-time.coerce/from-string to convert it from String to DateTime Instant.

So how can I extract the year-month-date from this, so I need 2017-02-14 as output

I know how to do it using regex or partly use regex and partly date

but I want to know how to achieve this using the date format entirely

check out the java.time.format package in the JDK

user=> (def d (java.time.LocalDateTime/now))
#'user/d
user=> d
#object[java.time.LocalDateTime 0x643ba1ed "2019-08-14T01:23:05.972628"]
user=> (.format d (java.time.format.DateTimeFormatter/ofPattern "yyyy-MM-dd"))
"2019-08-14"

So, how to put LocalDateTime format for this : “2019-07-13T14:00:00.000+10:00”

How to convert this to localDateTiem

what type are you starting with? what type do you want at the end?

so I am starting with this input - “2019-07-13T14:00:00.000+10:00” output- “2019-07-13"

so string / string

yes

So, need to convert input to locadateTime first

so would be best to first parse from string to LocalDateTime, using a DateTimeFormatter (once you create a formatter, it can be used to either parse or format)

then use a different formatter to format back to a string

https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/time/format/DateTimeFormatter.html

just be careful that you understand what you're doing with the timezone offset

I am using the joda time thing , it’s kind of a standard

it's not anymore

here in my organisation, should have specified that

the same developers that created joda developed the java.time packages which are now part of java

java.time and joda are similar as they were created by the same people

same formatter stuff exists

Okay, will have a look. I always had troubles with dates

If I’m in namespace app.db.core and I want to use a spec from app.db.entity is there a way to do that that doesn’t involve writing :app.db.entity/foo-spec every time I need to reference it?

Hi! im stucked trying to use a local library in my clojure project. I created a checkouts folder at the source directory, and symlinked the local lib, but when i run lein ring server, it seems it totally ignores what's in the checkouts...

@brandon149 you can also try (:require [app.db.entity :refer [::foo-spec]). I know it works with fn syms, I havent tried it with spec syms, but there is no reason it shouldnt work. You can also do refer-all to alias all the syms from that ns into the current ns.

@murtaza52 I tried out some stuff in the repl and it looks like doing a regular ns require will let you do :alias/foo

yes that should work too, and is actually the better option in your case. I did not mention id bcoz @vale had already mentioned it.

Is there a major blog post that people refer to for setting up their Clojure dev environment?

if you already use emacs or have been wanting to learn, then check out CIDER. emacs is a lot to learn and rewarding (i think) but has a long learning curve. Cursive is an excellent option and these two dominate the marketshare if i'm remembering the clojure survey results correctly. Outside of this there's Calva for VS code which reuses a lot of CIDER's underlying tooling and Chlorine for Atom. There's a really nice video from @seancorfield using Atom to fix a bug in a lib that is a nice showcase of its benefits and workflow. But once you choose from this list then just follow along with the docs/blogs about that tooling

FYI, Clojure survey 2019 results for dev environment can be found at "Q12" here: https://www.surveymonkey.com/results/SM-S9JVNXNQV/

Error messages are important to a lot of people!

Didn’t realize, I guess after a while you get so used to them

I think anything unfamiliar, that at first seems confusing and/or you believe was done better in previous dev environments you worked in, you notice and wish for what you used to have 🙂