again, I haven't felt much pain, so I'm not sure what I'm saying is entirely
true, but...
In the scenario I describe I have to :import the class created by defrecord to
reference it as part of extend-protocol
For example
in foo/recs.clj
(ns foo.recs)
(defrecord ARecord [a b])
in foo/prots.clj
(ns foo.prots
(:import [foo.recs ARecord]))
(defprotocol AProto
(handle [o]))
(extend-protocol AProto
ARecord
(handle [o]
;; do stuff
))
In that case, don't you need to record to become a class, so you can reference
it in foo.prots :import?
I'd really love to be wrong, so I get rid of this occasional issue. =)
Cheers, Jay
On Feb 15, 2012, at 10:51 AM, Stuart Halloway wrote:
>> I think this issue is related to using
>> defrecord
>> or
>> defrecord & defprotocol
>> or
>> defrecord, defprotocol, & extend-protocol
>>
>> I've never bothered to look into the simplest case at which it fails. I have
>> a namespace that has my defrecord, and another namespace that defines the
>> protocol and uses extend-protocol to add behavior for my record type. If I
>> recompile the namespace with the protocol everything is fine, if I recompile
>> the namespace with the defrecord the protocol stops finding the
>> implementation for the protocol. The solution is "rm -rf classes"
>>
>> As a work around I rm & restart my app if I ever change my record - which is
>> very rarely.
>
> A better solution is not to compile defrecords during development. If this is
> the default behavior of some tools, it is anti-incremental-dev and wrong IMO.
>
> Stu
>
>
> Stuart Halloway
> Clojure/core
> http://clojure.com
>
>
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