Oh I meant `clojure.spec/gen` instead of `clojure.spec/with-gen`.
`clojure.spec/gen` has an overrides option. I (think I) need something like
this to cleanly change the unforming action in a nested spec.
Jeroen
On Tue, Sep 6, 2016 at 8:00 PM, Jeroen van Dijk <jeroentjevand...@gmail.com>
wrote:
> Hi,
>
> I'm playing with the idea of using clojure.spec to make an API backwards
> compatible by using conform and unform to transform data from the old
> version format to a new format version. Below is an example of this in code:
>
> Say we have API change that involves changing the name of a nested key:
>
> (do
> ;; Old api
> (s/def :api.v0.input.nested/label keyword?)
> (s/def :api.v0.input/nested (s/keys :req-un
> [:api.v0.input.nested/label]))
> (s/def :api.v0/input (s/keys :req-un [:api.v0.input/nested]))
>
> ;; New api
> (s/def :api.v1.input.nested/key keyword?)
> (s/def :api.v1.input/nested (s/keys :req-un [:api.v1.input.nested/key]))
> (s/def :api.v1/input (s/keys :req-un [:api.v1.input/nested]))
>
> ;; Migration specs
> (s/def :api.v0-v1.migration.input/nested (s/conformer (fn [_] (throw
> (ex-info "Don't use as conformer" {})))
> (fn [x]
> (clojure.set/rename-keys x {:label :key}))))
>
> (s/def :api.v0-v1.migration/input (s/conformer (fn [x]
> (s/conform
> :api.v1/input x))
> (fn [x]
> (s/unform (s/keys
> :req-un [:api.v0-v1.migration.input/nested]) x))))
>
> ;; Changes {:nested {:label :hi}} to {:nested {:key :hi}}
> (s/unform :api.v0-v1.migration/input {:nested {:label :hi}}))
>
> So this kind of works, but I wonder whether there is an easier way or if
> I'm thinking about this the wrong way. I was hoping there would be
> something like with-unformer (like with-gen) that allows me to change the
> unforming action for a specific key without having to copy most of the old
> spec.
>
> Any suggestions or advise is appreciated.
>
> Thanks,
> Jeroen
>
>
>
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