Why are multi-methods not working as functions for Reagent/Re-frame?

Question

In a small app I\'m building that uses Reagent and Re-frame I\'m using multi-methods to dispatch which page should be shown based on a value in the app state:

(d         


        

Answer 1

The first problem that jumps out at me is that your methods take no arguments:

(defmethod layout/pages :register [] [register-page])
                                  ^ arglist

Here you have an empty arglist, but presumably you'll be calling this multimethod with one or two arguments (since its dispatch function is a keyword and keywords can be called with one or two arguments).

If you want to call this multimethod with a single argument and just ignore it inside the body of the :register method, change the above to

(defmethod layout/pages :register [_] [register-page])
                                   ^ argument to be ignored

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Also, I expect you'll probably want to call pages yourself like you previously did (that is, revert the change to square brackets that you mentioned in the question).

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This may or may not fix the app – there may be other problems – but it should get you started. (The multimethod will definitely not work with those empty arglists if you pass in any arguments.)