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<h1 id="plumatic-schema-coercion">Plumatic Schema Coercion</h1>
<p><a href="https://github.com/plumatic/schema" target="_blank">Plumatic Schema</a> is a Clojure(Script) library for declarative data description and validation.</p>
<pre><code class="lang-clj">(<span class="hljs-name">require</span> &apos;[reitit.coercion.schema])
(<span class="hljs-name">require</span> &apos;[reitit.coercion <span class="hljs-symbol">:as</span> coercion])
(<span class="hljs-name">require</span> &apos;[schema.core <span class="hljs-symbol">:as</span> s])
(<span class="hljs-name">require</span> &apos;[reitit.core <span class="hljs-symbol">:as</span> r])
(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
(<span class="hljs-name">r/router</span>
[<span class="hljs-string">&quot;/:company/users/:user-id&quot;</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::user-view</span>
<span class="hljs-symbol">:coercion</span> reitit.coercion.schema/coercion
<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:path</span> {<span class="hljs-symbol">:company</span> s/Str
<span class="hljs-symbol">:user-id</span> s/Int}}}]
{<span class="hljs-symbol">:compile</span> coercion/compile-request-coercers}))
(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> match-by-path-and-coerce! [path]
(<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>
<pre><code class="lang-clj">(<span class="hljs-name">match-by-path-and-coerce!</span> <span class="hljs-string">&quot;/metosin/users/123&quot;</span>)
<span class="hljs-comment">; #Match{:template &quot;/:company/users/:user-id&quot;,</span>
<span class="hljs-comment">; :data {:name :user/user-view,</span>
<span class="hljs-comment">; :coercion &lt;&lt;:schema&gt;&gt;</span>
<span class="hljs-comment">; :parameters {:path {:company java.lang.String,</span>
<span class="hljs-comment">; :user-id Int}}},</span>
<span class="hljs-comment">; :result {:path #object[reitit.coercion$request_coercer$]},</span>
<span class="hljs-comment">; :path-params {:company &quot;metosin&quot;, :user-id &quot;123&quot;},</span>
<span class="hljs-comment">; :parameters {:path {:company &quot;metosin&quot;, :user-id 123}}</span>
<span class="hljs-comment">; :path &quot;/metosin/users/123&quot;}</span>
</code></pre>
<p>Failing coercion:</p>
<pre><code class="lang-clj">(<span class="hljs-name">match-by-path-and-coerce!</span> <span class="hljs-string">&quot;/metosin/users/ikitommi&quot;</span>)
<span class="hljs-comment">; =&gt; ExceptionInfo Request coercion failed...</span>
</code></pre>
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