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Coercion
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Route Data Validation
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href=".." >Coercion Explained</a>
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</h1>
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<section class="normal markdown-section">
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<h1 id="coercion-explained">Coercion Explained</h1>
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<p>Coercion is a process of transforming parameters (and responses) from one format into another. Reitit separates routing and coercion into two separate steps.</p>
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<p>By default, all wildcard and catch-all parameters are parsed into strings:</p>
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<pre><code class="lang-clj">(<span class="hljs-name">require</span> '[reitit.core <span class="hljs-symbol">:as</span> r])
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(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
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(<span class="hljs-name">r/router</span>
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[<span class="hljs-string">"/:company/users/:user-id"</span> <span class="hljs-symbol">::user-view</span>]))
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</code></pre>
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<p>Match with the parsed <code>:path-params</code> as strings:</p>
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<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> r <span class="hljs-string">"/metosin/users/123"</span>)
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<span class="hljs-comment">; #Match{:template "/:company/users/:user-id",</span>
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<span class="hljs-comment">; :data {:name :user/user-view},</span>
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<span class="hljs-comment">; :result nil,</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">; :path "/metosin/users/123"}</span>
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</code></pre>
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<p>To enable parameter coercion, the following things need to be done:</p>
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<ol>
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<li>Define a <code>Coercion</code> for the routes</li>
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<li>Define types for the parameters</li>
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<li>Compile coercers for the types</li>
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<li>Apply the coercion</li>
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</ol>
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<h2 id="define-coercion">Define Coercion</h2>
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<p><code>reitit.coercion/Coercion</code> is a protocol defining how types are defined, coerced and inventoried.</p>
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<p>Reitit ships with the following coercion modules:</p>
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<ul>
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<li><code>reitit.coercion.schema/coercion</code> for <a href="https://github.com/plumatic/schema" target="_blank">plumatic schema</a></li>
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<li><code>reitit.coercion.spec/coercion</code> for both <a href="https://clojure.org/about/spec" target="_blank">clojure.spec</a> and <a href="https://github.com/metosin/spec-tools#data-specs" target="_blank">data-specs</a></li>
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</ul>
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<p>Coercion can be attached to route data under <code>:coercion</code> key. There can be multiple <code>Coercion</code> implementations within a single router, normal <a href="../basics/route_data.html#nested-route-data">scoping rules</a> apply.</p>
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<h2 id="defining-parameters">Defining parameters</h2>
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<p>Route parameters can be defined via route data <code>:parameters</code>. It has keys for different type of parameters: <code>:query</code>, <code>:body</code>, <code>:form</code>, <code>:header</code> and <code>:path</code>. Syntax for the actual parameters depends on the <code>Coercion</code> implementation.</p>
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<p>Example with Schema path-parameters:</p>
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<pre><code class="lang-clj">(<span class="hljs-name">require</span> '[reitit.coercion.schema])
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(<span class="hljs-name">require</span> '[schema.core <span class="hljs-symbol">:as</span> s])
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(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
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(<span class="hljs-name">r/router</span>
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[<span class="hljs-string">"/:company/users/:user-id"</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::user-view</span>
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<span class="hljs-symbol">:coercion</span> reitit.coercion.schema/coercion
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<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:path</span> {<span class="hljs-symbol">:company</span> s/Str
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<span class="hljs-symbol">:user-id</span> s/Int}}}]))
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</code></pre>
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<p>A Match:</p>
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<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> r <span class="hljs-string">"/metosin/users/123"</span>)
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<span class="hljs-comment">; #Match{:template "/:company/users/:user-id",</span>
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<span class="hljs-comment">; :data {:name :user/user-view,</span>
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<span class="hljs-comment">; :coercion <<:schema>></span>
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<span class="hljs-comment">; :parameters {:path {:company java.lang.String,</span>
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<span class="hljs-comment">; :user-id Int}}},</span>
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<span class="hljs-comment">; :result nil,</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">; :path "/metosin/users/123"}</span>
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</code></pre>
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<p>Coercion was not applied. Why? In Reitit, routing and coercion are separate processes and we have done just the routing part. We need to apply coercion after the successful routing.</p>
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<p>But now we should have enough data on the match to apply the coercion.</p>
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<h2 id="compiling-coercers">Compiling coercers</h2>
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<p>Before the actual coercion, we <del>should</del> need to compile the coercers against the route data. Compiled coercers yield much better performance and the manual step of adding a coercion compiler makes things explicit and non-magical.</p>
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<p>Compiling can be done via a Middleware, Interceptor or a Router. We apply it now at router-level, effecting all routes (with <code>:parameters</code> and <code>:coercion</code> defined).</p>
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<p>There is a helper function <code>reitit.coercion/compile-request-coercers</code> just for this:</p>
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<pre><code class="lang-clj">(<span class="hljs-name">require</span> '[reitit.coercion <span class="hljs-symbol">:as</span> coercion])
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(<span class="hljs-name">require</span> '[reitit.coercion.schema])
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(<span class="hljs-name">require</span> '[schema.core <span class="hljs-symbol">:as</span> s])
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(<span class="hljs-name"><span class="hljs-builtin-name">def</span></span> router
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(<span class="hljs-name">r/router</span>
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[<span class="hljs-string">"/:company/users/:user-id"</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::user-view</span>
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<span class="hljs-symbol">:coercion</span> reitit.coercion.schema/coercion
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<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:path</span> {<span class="hljs-symbol">:company</span> s/Str
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<span class="hljs-symbol">:user-id</span> s/Int}}}]
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{<span class="hljs-symbol">:compile</span> coercion/compile-request-coercers}))
|
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</code></pre>
|
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<p>Routing again:</p>
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<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> r <span class="hljs-string">"/metosin/users/123"</span>)
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<span class="hljs-comment">; #Match{:template "/:company/users/:user-id",</span>
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<span class="hljs-comment">; :data {:name :user/user-view,</span>
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<span class="hljs-comment">; :coercion <<:schema>></span>
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<span class="hljs-comment">; :parameters {:path {:company java.lang.String,</span>
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<span class="hljs-comment">; :user-id Int}}},</span>
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<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">; :path "/metosin/users/123"}</span>
|
|
</code></pre>
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|
<p>The compiler added a <code>:result</code> key into the match (done just once, at router creation time), which holds the compiled coercers. We are almost done.</p>
|
|
<h2 id="applying-coercion">Applying coercion</h2>
|
|
<p>We can use a helper function <code>reitit.coercion/coerce!</code> to do the actual coercion, based on a <code>Match</code>:</p>
|
|
<pre><code class="lang-clj">(<span class="hljs-name">coercion/coerce!</span>
|
|
(<span class="hljs-name">r/match-by-path</span> router <span class="hljs-string">"/metosin/users/123"</span>))
|
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<span class="hljs-comment">; {:path {:company "metosin", :user-id 123}}</span>
|
|
</code></pre>
|
|
<p>We get the coerced paremeters back. If a coercion fails, a typed (<code>:reitit.coercion/request-coercion</code>) ExceptionInfo is thrown, with data about the actual error:</p>
|
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<pre><code class="lang-clj">(<span class="hljs-name">coercion/coerce!</span>
|
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(<span class="hljs-name">r/match-by-path</span> router <span class="hljs-string">"/metosin/users/ikitommi"</span>))
|
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<span class="hljs-comment">; => ExceptionInfo Request coercion failed:</span>
|
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<span class="hljs-comment">; #CoercionError{:schema {:company java.lang.String, :user-id Int, Any Any},</span>
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<span class="hljs-comment">; :errors {:user-id (not (integer? "ikitommi"))}}</span>
|
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<span class="hljs-comment">; clojure.core/ex-info (core.clj:4739)</span>
|
|
</code></pre>
|
|
<h2 id="full-example">Full example</h2>
|
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<p>Here's an full example for doing routing and coercion with Reitit and Schema:</p>
|
|
<pre><code class="lang-clj">(<span class="hljs-name">require</span> '[reitit.coercion.schema])
|
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(<span class="hljs-name">require</span> '[reitit.coercion <span class="hljs-symbol">:as</span> coercion])
|
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(<span class="hljs-name">require</span> '[reitit.core <span class="hljs-symbol">:as</span> r])
|
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(<span class="hljs-name">require</span> '[schema.core <span class="hljs-symbol">:as</span> s])
|
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|
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(<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.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))))
|
|
|
|
(<span class="hljs-name">match-by-path-and-coerce!</span> <span class="hljs-string">"/metosin/users/123"</span>)
|
|
<span class="hljs-comment">; #Match{:template "/:company/users/:user-id",</span>
|
|
<span class="hljs-comment">; :data {:name :user/user-view,</span>
|
|
<span class="hljs-comment">; :coercion <<:schema>></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 "metosin", :user-id "123"},</span>
|
|
<span class="hljs-comment">; :parameters {:path {:company "metosin", :user-id 123}}</span>
|
|
<span class="hljs-comment">; :path "/metosin/users/123"}</span>
|
|
|
|
(<span class="hljs-name">match-by-path-and-coerce!</span> <span class="hljs-string">"/metosin/users/ikitommi"</span>)
|
|
<span class="hljs-comment">; => ExceptionInfo Request coercion failed...</span>
|
|
</code></pre>
|
|
<h2 id="ring-coercion">Ring Coercion</h2>
|
|
<p>For a full-blown http-coercion, see the <a href="../ring/coercion.html">ring coercion</a>.</p>
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