In practice this is a lot of information though, and often it's a
coincidence that
the dispatch entry comes first since maps are unordered.
See the following error I found in practice using namespaced keywords
pervasively
missing a :spec-play.destruct/type|or method. It's rather large and
I'm glad the relevant entry came first.
CompilerException clojure.lang.ExceptionInfo: Call to
#'spec-play.destruct/parse-type did not conform to spec:
At: [:ret] val: {:spec-play.destruct/type|type :spec-play.destruct/type|or,
:spec-play.destruct/or|types [{:spec-play.destruct/type|type
:spec-play.destruct/type|N}]}
fails predicate: spec-play.destruct/type-type, no method
:clojure.spec/args ((clojure.core/or N))
Here are two ideas that might solve this:
1. Use the result of applying the dispatch function to the input in the
error message.
2. Allow custom error messages in the default method (ie. return something
more
interesting than nil).
Thanks,
Ambrose
On Wed, May 25, 2016 at 10:30 AM, Alex Miller <a...@puredanger.com> wrote:
> Rich pointed out that this is telling you the predicate
> :my.domain/event-type and the value it received: {:event/type
> :event/restart} which seems to be telling you everything you need to know
> wrt to the missing method.
>
> The dispatch method is opaque (even though it is simple here), so doesn't
> make sense to generically add anything additional to this message.
>
> On Tuesday, May 24, 2016 at 10:53:43 PM UTC-5, Ambrose Bonnaire-Sergeant
> wrote:
>>
>> Thanks for the guide Alex.
>>
>> Is it possible to get more information in the "no method" error returned
>> by
>> multi-spec?
>>
>> (s/explain :event/event {:event/type :event/restart})
>> ;; val: {:event/type :event/restart} fails predicate:
>> my.domain/event-type, no method
>>
>> It would be nice to mention exactly which method is missing here (ie.
>> :event/restart).
>>
>> Thanks,
>> Ambrose
>>
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