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< h1 id = "clojurespec-coercion" > Clojure.spec Coercion< / h1 >
< p > The < a href = "https://clojure.org/guides/spec" target = "_blank" > clojure.spec< / a > library specifies the structure of data, validates or destructures it, and can generate data based on the spec.< / p >
< p > < strong > NOTE< / strong > : Currently, < code > clojure.spec< / code > < a href = "https://dev.clojure.org/jira/browse/CLJ-2116" target = "_blank" > doesn' t support runtime transformations via conforming< / a > , so one needs to wrap all specs into < a href = "https://github.com/metosin/spec-tools/blob/master/README.md#spec-records" target = "_blank" > Spec Records< / a > to get the coercion working.< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > require< / span > ' [reitit.coercion.spec])
(< span class = "hljs-name" > require< / span > ' [reitit.coercion < span class = "hljs-symbol" > :as< / span > coercion])
(< span class = "hljs-name" > require< / span > ' [spec-tools.spec < span class = "hljs-symbol" > :as< / span > spec])
(< span class = "hljs-name" > require< / span > ' [clojure.spec.alpha < span class = "hljs-symbol" > :as< / span > s])
(< span class = "hljs-name" > require< / span > ' [reitit.core < span class = "hljs-symbol" > :as< / span > r])
< span class = "hljs-comment" > ;; need to wrap the primitives!< / span >
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::company< / span > spec/string?)
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::user-id< / span > spec/int?)
(< span class = "hljs-name" > s/def< / span > < span class = "hljs-symbol" > ::path-params< / span > (< span class = "hljs-name" > s/keys< / span > < span class = "hljs-symbol" > :req-un< / span > [< span class = "hljs-symbol" > ::company< / span > < span class = "hljs-symbol" > ::user-id< / span > ]))
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > def< / span > < / span > router
(< span class = "hljs-name" > r/router< / span >
[< span class = "hljs-string" > " /:company/users/:user-id" < / span > {< span class = "hljs-symbol" > :name< / span > < span class = "hljs-symbol" > ::user-view< / span >
< span class = "hljs-symbol" > :coercion< / span > reitit.coercion.spec/coercion
< span class = "hljs-symbol" > :parameters< / span > {< span class = "hljs-symbol" > :path< / span > < span class = "hljs-symbol" > ::path-params< / span > }}]
{< span class = "hljs-symbol" > :compile< / span > coercion/compile-request-coercers}))
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(< span class = "hljs-name" > < span class = "hljs-builtin-name" > defn< / span > < / span > match-by-path-and-coerce! [path]
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(< span class = "hljs-name" > < span class = "hljs-builtin-name" > if-let< / span > < / span > [match (< span class = "hljs-name" > r/match-by-path< / span > router path)]
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > assoc< / span > < / span > match < span class = "hljs-symbol" > :parameters< / span > (< span class = "hljs-name" > coercion/coerce!< / span > match))))
< / code > < / pre >
< p > Successful coercion:< / p >
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< pre > < code class = "lang-clj" > (< span class = "hljs-name" > match-by-path-and-coerce!< / span > < span class = "hljs-string" > " /metosin/users/123" < / span > )
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< span class = "hljs-comment" > ; #Match{:template " /:company/users/:user-id" ,< / span >
< span class = "hljs-comment" > ; :data {:name :user/user-view,< / span >
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< span class = "hljs-comment" > ; :coercion < < :spec> > < / span >
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< span class = "hljs-comment" > ; :parameters {:path ::path-params}},< / span >
< span class = "hljs-comment" > ; :result {:path #object[reitit.coercion$request_coercer$]},< / span >
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< span class = "hljs-comment" > ; :path-params {:company " metosin" , :user-id " 123" },< / span >
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< span class = "hljs-comment" > ; :parameters {:path {:company " metosin" , :user-id 123}}< / span >
< span class = "hljs-comment" > ; :path " /metosin/users/123" }< / span >
< / code > < / pre >
< p > Failing coercion:< / p >
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< pre > < code class = "lang-clj" > (< span class = "hljs-name" > match-by-path-and-coerce!< / span > < span class = "hljs-string" > " /metosin/users/ikitommi" < / span > )
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< span class = "hljs-comment" > ; => ExceptionInfo Request coercion failed...< / span >
< / code > < / pre >
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