Converting json to work with clojure.spec

[Jonathon McKitrick]

A good chunk of my API consists of returning Yesql directly as the body of the response. But clojure.spec wants namespaced keywords. Is there a simple way to wrap my json responses to make them conform to this requirement?

[Alex Miller]

s/keys has :req-un and :opt-un alternatives for un-qualified keys.

[Jonathon McKitrick]

Ah, I see that now.

That being said, I see the benefits in moving to namespace qualified keys. Currently, I'm returning structures directly in Compojure handlers, and the JSON conversion is implicitly handled. I checked Cheshire and didn't immediately see a way to generate namespaced keys. What's the best way to do this?

[Brian Scaturro]

Hi Jonathon,

I am trying to figure out the same thing. I am using all namespace qualified keys, but curious how this works when using s/conform on a json payload. Did you ever find a solution for this?

Thanks!

Brian

[Peter Hull]

On Sunday, 4 December 2016 15:11:55 UTC, Jonathon McKitrick wrote:

That being said, I see the benefits in moving to namespace qualified keys. Currently, I'm returning structures directly in Compojure handlers, and the JSON conversion is implicitly handled. I checked Cheshire and didn't immediately see a way to generate namespaced keys. What's the best way to do this?

parse-string takes a second argument that converts from a JSON string key to whatever you want for your clojure key - see 3rd example in https://github.com/dakrone/cheshire#decoding
So you could have something like:
 

(ns chtst.core
  (:require [cheshire.core :refer [parse-string]]
            [clojure.pprint :refer [pprint]])
  (:gen-class))

(def fields { "name" ::name, "age" ::age})

(defn -main
  [& args]
  (let [example (parse-string "{\"name\":\"fred\", \"age\":29}" fields)]
    (pprint example)))

However this doesn't produce good results if your JSON contains a key you haven't listed in fields - so you'd probably have to write an actual function to do the mapping.

Does that help?
Pete

[jmcki...@gmail.com]

Hmm, that might be useful. I assume it would make sense for an API called from other apps, but not so much for internal web services called from your own client app.

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[Sean Corfield]

> However this doesn't produce good results if your JSON contains a key you haven't listed in fields –

> so you'd probably have to write an actual function to do the mapping.

 

(def my-ns *ns*) ; bind at compile time

;; or use a constant string for the ns if you want

(defn fields [k] (keyword (str my-ns) k))

 

(fields “name”)

;;=> :chtst.core/name

 

Sean Corfield -- (970) FOR-SEAN -- (904) 302-SEAN
An Architect's View -- http://corfield.org/

"If you're not annoying somebody, you're not really alive."
-- Margaret Atwood

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