::meta would be better, to ensure against clashing with a key that a Foo
might happen to use.
On Thu, Aug 22, 2013 at 7:00 AM, Meikel Brandmeyer (kotarak)
<m...@kotka.de>wrote:
> Hi,
>
> Am Donnerstag, 22. August 2013 11:32:37 UTC+2 schrieb Jim foo.bar:
>
>> Oh wow! I shouldn't have turned my computer off yesterday evening!!!
>> there were many suggestions to try out... :)
>>
>> Ok let's see...I've got a record with meta-data let's call it FOO and its
>> instance MFOO:
>>
>> user=> (defrecord FOO [a b c])
>> user.FOO
>> user=> (def MFOO (with-meta (FOO. 1 2 3) {:x false :y true}))
>> #'user/MFOO
>>
>> Now I want to serialise it but keep the meta-data when reading it back
>> in. pint-dup seems like my only option as it preserves metadata. As you
>> say though, there is no dispatch for '=' so it seems like I'm stuck with
>> standard java serialisation. Even i I convert it to a map with metadata the
>> same thing will happen (#=)...
>>
>> Is there no way to keep the metadata?
>>
>> many many thanks :)
>>
>>
> (defmethod print-method Foo
> [foo ^Writer w]
> (.write w "#my/foo ")
> (print-method {:a (:a foo) :b (:b foo) :c (:c foo) :meta (meta foo)} w))
>
> (defn foo-reader
> [foo-data]
> (with-meta (map->Foo (dissoc foo-data :meta)) (:meta foo-data)))
>
> Read with:
>
> (edn/read {'my/foo foo-reader} ...)
>
> Printing might be optimised a bit. And the :meta key could be made more
> robust. (records may contain arbitrary keys.)
>
> Kind regards
> Meikel
>
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