Clojure, Compojure: Reading Post Request RAW Json

Question

I am able to read RAW JSON of Post Request. But Not sure that I am doing it in right way or not?

CODE

(ns clojure-dauble-business-api.core
  (:require [compojure.api.sweet :refer :all]
            [ring.util.http-response :refer :all]
            [clojure-dauble-business-api.logic :as logic]
            [clojure.tools.logging :as log]
            [clojure-dauble-business-api.domain.artwork])
  (:import [clojure_dauble_business_api.domain.artwork Artwork]))

(defapi app
  (GET "/hello" []
    (log/info "Function begins from here")
    (ok {:artwork (logic/artwork-id 10)}))
  (POST "/create" params
   (log/info "Create - Function begins from here and body" (:name (:artwork (:params params))))
   (ok {:artwork (logic/create-city (:name (:artwork (:params params))))})))

RAW JSON Of POST Request

{
  "artwork": {
    "id": 10,
    "name": "DEFAULT"
  }
}

using this line (:name (:artwork (:params params))) to fetch "name" value from the above RAW Json.

If I am not doing in right way, Please guide me what will be the right way?

Answer 1

If I understand your question correctly, it looks like you are asking if there's a more "proper" way to fetch :name with less awkward nesting of parentheses?

To retrieve a value such as :name from a nested associative structure (hash-map) you can use get-in:

(get-in params [:params :artwork :name])

This is neater and easier to read (left to right) with less nesting, but it is also a safer way to attempt to fetch a value, because get-in will return nil if it can't find a key in the sequence of keys.