Custom Transit writer for Joda time in Clojure

Question

Clojure's transit does not support the Joda time format out of the box. How can I add write support for org.joda.time.DateTime?

score 9 · Accepted Answer · edited Jun 29 '16 at 12:38

9

Add this function:

(def joda-time-writer
  (transit/write-handler
   (constantly "m")
   #(-> % coerce/to-date .getTime)
   #(-> % coerce/to-date .getTime .toString)))

And use it like this:

(transit/writer out :json
                    {:handlers {org.joda.time.DateTime joda-time-writer}})

edited Jun 29 '16 at 12:38

Petrus Theron

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answered Aug 29 '14 at 20:24

David J.

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2

This is explained in more detail here: http://increasinglyfunctional.com/2014/09/02/custom-transit-writers-clojure-joda-time/ – David J. Sep 02 '14 at 21:59
Where does `out` come from? – Petrus Theron Jun 29 '16 at 11:03

score 0 · Answer 2 · answered Apr 26 '17 at 15:08

To get this to work with ring-middleware-format, do this, using the joda-time-writer function posted by David J.

(defn wrap-format [handler]
  (let [transit-opts {:handlers {org.joda.time.DateTime
                                 joda-time-writer}}]
    (wrap-restful-format handler
                         {:response-options
                          {:transit-json transit-opts
                           :transit-messagepack transit-opts}})))

Custom Transit writer for Joda time in Clojure

2 Answers2