Clojure om next multiple print-method exception

Question

I am trying to build server-side rendering for om.next (1.0.0-alpha47). At some point I have to create a reconciler from Clojure:

 (om/reconciler {})

 (om/reconciler
  {:state     (atom {})
   :normalize true
   :parser    (om/parser {})})

However evaluating any of these in my REPL gives:

Unhandled java.lang.IllegalArgumentException Multiple methods in multimethod 'print-method' match dispatch value: class
om.next.Reconciler -> interface clojure.lang.IDeref and interface
clojure.lang.IRecord, and neither is preferred

How do I fix that?

Is this https://clojuredocs.org/clojure.core/prefer-method helpful? — KobbyPemson, Dec 11 '16 at 02:49
@KobbyPemson that looks useful though I wouldn't know how to use it. — nha, Dec 11 '16 at 14:17

score 2 · Accepted Answer · answered Dec 12 '16 at 11:43

2

I came to this solution via trial and error:

(prefer-method print-method clojure.lang.IPersistentMap clojure.lang.IDeref)

This seems to solve the conflict, sorry that I can't explain any details.

answered Dec 12 '16 at 11:43

bert

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Clojure om next multiple print-method exception

1 Answers1