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Route syntax
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Path-based Routing
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Route data
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Advanced
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Route conflicts
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Route Validation
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Configuring routers
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Ring
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Parameter coercion
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Compiling middleware
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TODO: Interceptors
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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="." >Route syntax</a>
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</h1>
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<section class="normal markdown-section">
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<h1 id="route-syntax">Route Syntax</h1>
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<p>Raw routes are defined as vectors, which have a String path, optional (non-sequential) route argument and optional child routes. Routes can be wrapped in vectors and lists and <code>nil</code> routes are ignored. Paths can have path-parameters (<code>:id</code>) or catch-all-parameters (<code>*path</code>).</p>
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<p>Simple route:</p>
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<pre><code class="lang-clj">[<span class="hljs-string">"/ping"</span>]
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</code></pre>
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<p>Two routes:</p>
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<pre><code class="lang-clj">[[<span class="hljs-string">"/ping"</span>]
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[<span class="hljs-string">"/pong"</span>]]
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</code></pre>
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<p>Routes with route arguments:</p>
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<pre><code class="lang-clj">[[<span class="hljs-string">"/ping"</span> <span class="hljs-symbol">::ping</span>]
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[<span class="hljs-string">"/pong"</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::pong</span>}]]
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</code></pre>
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<p>Routes with path parameters:</p>
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<pre><code class="lang-clj">[[<span class="hljs-string">"/users/:user-id"</span>]
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[<span class="hljs-string">"/api/:version/ping"</span>]]
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</code></pre>
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<p>Route with catch-all parameter:</p>
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<pre><code class="lang-clj">[<span class="hljs-string">"/public/*path"</span>]
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</code></pre>
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<p>Nested routes:</p>
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<pre><code class="lang-clj">[<span class="hljs-string">"/api"</span>
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[<span class="hljs-string">"/admin"</span> {<span class="hljs-symbol">:middleware</span> [<span class="hljs-symbol">::admin</span>]}
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[<span class="hljs-string">""</span> <span class="hljs-symbol">::admin</span>]
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[<span class="hljs-string">"/db"</span> <span class="hljs-symbol">::db</span>]]
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[<span class="hljs-string">"/ping"</span> <span class="hljs-symbol">::ping</span>]]
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</code></pre>
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<p>Same routes flattened:</p>
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<pre><code class="lang-clj">[[<span class="hljs-string">"/api/admin"</span> {<span class="hljs-symbol">:middleware</span> [<span class="hljs-symbol">::admin</span>], <span class="hljs-symbol">:name</span> <span class="hljs-symbol">::admin</span>}]
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[<span class="hljs-string">"/api/admin/db"</span> {<span class="hljs-symbol">:middleware</span> [<span class="hljs-symbol">::admin</span>], <span class="hljs-symbol">:name</span> <span class="hljs-symbol">::db</span>}]
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[<span class="hljs-string">"/api/ping"</span> {<span class="hljs-symbol">:name</span> <span class="hljs-symbol">::ping</span>}]]
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</code></pre>
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<p>As routes are just data, it's easy to create them programamtically:</p>
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<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">defn</span></span> cqrs-routes [actions dev-mode?]
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[<span class="hljs-string">"/api"</span> {<span class="hljs-symbol">:interceptors</span> [<span class="hljs-symbol">::api</span> <span class="hljs-symbol">::db</span>]}
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(<span class="hljs-name"><span class="hljs-builtin-name">for</span></span> [[type interceptor] actions
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<span class="hljs-symbol">:let</span> [path (<span class="hljs-name"><span class="hljs-builtin-name">str</span></span> <span class="hljs-string">"/"</span> (<span class="hljs-name"><span class="hljs-builtin-name">name</span></span> interceptor))
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method (<span class="hljs-name"><span class="hljs-builtin-name">condp</span></span> = type
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<span class="hljs-symbol">:query</span> <span class="hljs-symbol">:get</span>
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<span class="hljs-symbol">:command</span> <span class="hljs-symbol">:post</span>)]]
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[path {method {<span class="hljs-symbol">:interceptors</span> [interceptor]}}])
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(<span class="hljs-name"><span class="hljs-builtin-name">if</span></span> dev-mode? [<span class="hljs-string">"/dev-tools"</span> <span class="hljs-symbol">::dev-tools</span>])])
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</code></pre>
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<pre><code class="lang-clj">(<span class="hljs-name">cqrs-routes</span>
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[[<span class="hljs-symbol">:query</span> 'get-user]
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[<span class="hljs-symbol">:command</span> 'add-user]
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[<span class="hljs-symbol">:command</span> 'add-order]]
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<span class="hljs-literal">false</span>)
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<span class="hljs-comment">; ["/api" {:interceptors [::api ::db]}</span>
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<span class="hljs-comment">; (["/get-user" {:get {:interceptors [get-user]}}]</span>
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<span class="hljs-comment">; ["/add-user" {:post {:interceptors [add-user]}}]</span>
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<span class="hljs-comment">; ["/add-order" {:post {:interceptors [add-order]}}])</span>
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<span class="hljs-comment">; nil]</span>
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</code></pre>
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<h1 id="router">Router</h1>
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<p>Routes are just data and to do actual routing, we need a Router satisfying the <code>reitit.core/Router</code> protocol. Routers are created with <code>reitit.core/router</code> function, taking the raw routes and optionally an options map. Raw routes gets expanded and optionally coerced and compiled.</p>
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<p><code>Router</code> protocol:</p>
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<pre><code class="lang-clj">(<span class="hljs-name"><span class="hljs-builtin-name">defprotocol</span></span> Router
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(<span class="hljs-name">router-name</span> [this])
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(<span class="hljs-name">routes</span> [this])
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(<span class="hljs-name">options</span> [this])
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(<span class="hljs-name">route-names</span> [this])
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(<span class="hljs-name">match-by-path</span> [this path])
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(<span class="hljs-name">match-by-name</span> [this name] [this name params]))
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</code></pre>
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<p>Creating a router:</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">"/api"</span>
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[<span class="hljs-string">"/ping"</span> <span class="hljs-symbol">::ping</span>]
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[<span class="hljs-string">"/user/:id"</span> <span class="hljs-symbol">::user</span>]]]))
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</code></pre>
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<p>Router flattens the raw routes and expands the route arguments using <code>reitit.core/Expand</code> protocol. By default, <code>Keyword</code>s are expanded to <code>:name</code> and functions are expaned to <code>:handler</code>. <code>nil</code> routes are removed. The expanded routes can be retrieved with router:</p>
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<pre><code class="lang-clj">(<span class="hljs-name">r/routes</span> router)
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<span class="hljs-comment">; [["/api/ping" {:name :user/ping}]</span>
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<span class="hljs-comment">; ["/api/user/:id" {:name :user/user}]]</span>
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</code></pre>
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<h2 id="path-based-routing">Path-based routing</h2>
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<p>Path-based routing is done using the <code>reitit.core/match-by-path</code> function. It takes the router and path as arguments and returns one of the following:</p>
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<ul>
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<li><code>nil</code>, no match</li>
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<li><code>PartialMatch</code>, path matched, missing path-parameters (only in reverse-routing)</li>
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<li><code>Match</code>, exact match</li>
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</ul>
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<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> router <span class="hljs-string">"/hello"</span>)
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<span class="hljs-comment">; nil</span>
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</code></pre>
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<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> router <span class="hljs-string">"/api/user/1"</span>)
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<span class="hljs-comment">; #Match{:template "/api/user/:id"</span>
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<span class="hljs-comment">; :meta {:name :user/user}</span>
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<span class="hljs-comment">; :path "/api/user/1"</span>
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<span class="hljs-comment">; :result nil</span>
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<span class="hljs-comment">; :params {:id "1"}}</span>
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</code></pre>
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<h2 id="name-based-routing">Name-based routing</h2>
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<p>All routes which <code>:name</code> route data defined, can be matched by name.</p>
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<p>Listing all route names:</p>
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<pre><code class="lang-clj">(<span class="hljs-name">r/route-names</span> router)
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<span class="hljs-comment">; [:user/ping :user/user]</span>
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</code></pre>
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<p>Matching by name:</p>
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<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-name</span> router <span class="hljs-symbol">::user</span>)
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<span class="hljs-comment">; #PartialMatch{:template "/api/user/:id",</span>
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<span class="hljs-comment">; :meta {:name :user/user},</span>
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<span class="hljs-comment">; :result nil,</span>
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<span class="hljs-comment">; :params nil,</span>
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<span class="hljs-comment">; :required #{:id}}</span>
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(<span class="hljs-name">r/partial-match?</span> (<span class="hljs-name">r/match-by-name</span> router <span class="hljs-symbol">::user</span>))
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<span class="hljs-comment">; true</span>
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</code></pre>
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<p>We only got a partial match as we didn't provide the needed path-parameters. Let's provide the them too:</p>
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<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-name</span> router <span class="hljs-symbol">::user</span> {<span class="hljs-symbol">:id</span> <span class="hljs-string">"1"</span>})
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<span class="hljs-comment">; #Match{:template "/api/user/:id"</span>
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<span class="hljs-comment">; :meta {:name :user/user}</span>
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<span class="hljs-comment">; :path "/api/user/1"</span>
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<span class="hljs-comment">; :result nil</span>
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<span class="hljs-comment">; :params {:id "1"}}</span>
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</code></pre>
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<p>There is also a exception throwing version:</p>
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<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-name!</span> router <span class="hljs-symbol">::user</span>)
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<span class="hljs-comment">; ExceptionInfo missing path-params for route /api/user/:id: #{:id}</span>
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</code></pre>
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<h1 id="route-data">Route data</h1>
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<p>Routes can have arbitrary meta-data, interpreted by the router (via it's <code>:compile</code> hook) or the application itself. For nested routes, route data is accumulated recursively using <a href="https://github.com/weavejester/meta-merge" target="_blank">meta-merge</a>. By default, it appends collections, but it can be overridden to do <code>:prepend</code>, <code>:replace</code> or <code>:displace</code>.</p>
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<p>An example router with nested data:</p>
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<pre><code class="lang-clj">(<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">"/api"</span> {<span class="hljs-symbol">:interceptors</span> [<span class="hljs-symbol">::api</span>]}
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[<span class="hljs-string">"/ping"</span> <span class="hljs-symbol">::ping</span>]
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[<span class="hljs-string">"/admin"</span> {<span class="hljs-symbol">:roles</span> #{<span class="hljs-symbol">:admin</span>}}
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[<span class="hljs-string">"/users"</span> <span class="hljs-symbol">::users</span>]
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[<span class="hljs-string">"/db"</span> {<span class="hljs-symbol">:interceptors</span> [<span class="hljs-symbol">::db</span>]
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<span class="hljs-symbol">:roles</span> ^<span class="hljs-symbol">:replace</span> #{<span class="hljs-symbol">:db-admin</span>}}
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[<span class="hljs-string">"/:db"</span> {<span class="hljs-symbol">:parameters</span> {<span class="hljs-symbol">:db</span> String}}
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[<span class="hljs-string">"/drop"</span> <span class="hljs-symbol">::drop-db</span>]
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[<span class="hljs-string">"/stats"</span> <span class="hljs-symbol">::db-stats</span>]]]]]))
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</code></pre>
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<p>Resolved route tree:</p>
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<pre><code class="lang-clj">(<span class="hljs-name">reitit/routes</span> router)
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<span class="hljs-comment">; [["/api/ping" {:interceptors [::api]</span>
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<span class="hljs-comment">; :name ::ping}]</span>
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<span class="hljs-comment">; ["/api/admin/users" {:interceptors [::api]</span>
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<span class="hljs-comment">; :roles #{:admin}</span>
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<span class="hljs-comment">; :name ::users}]</span>
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<span class="hljs-comment">; ["/api/admin/db/:db/drop" {:interceptors [::api ::db]</span>
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<span class="hljs-comment">; :roles #{:db-admin}</span>
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<span class="hljs-comment">; :parameters {:db String}</span>
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<span class="hljs-comment">; :name ::drop-db}]</span>
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<span class="hljs-comment">; ["/api/admin/db/:db/stats" {:interceptors [::api ::db]</span>
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<span class="hljs-comment">; :roles #{:db-admin}</span>
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<span class="hljs-comment">; :parameters {:db String}</span>
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<span class="hljs-comment">; :name ::db-stats}]]</span>
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</code></pre>
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<p>Route data is returned with <code>Match</code> and the application can act based on it.</p>
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<pre><code class="lang-clj">(<span class="hljs-name">r/match-by-path</span> router <span class="hljs-string">"/api/admin/db/users/drop"</span>)
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<span class="hljs-comment">; #Match{:template "/api/admin/db/:db/drop"</span>
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<span class="hljs-comment">; :meta {:interceptors [::api ::db]</span>
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<span class="hljs-comment">; :roles #{:db-admin}</span>
|
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<span class="hljs-comment">; :parameters {:db String}</span>
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<span class="hljs-comment">; :name ::drop-db}</span>
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<span class="hljs-comment">; :result nil</span>
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<span class="hljs-comment">; :params {:db "users"}</span>
|
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<span class="hljs-comment">; :path "/api/admin/db/users/drop"}</span>
|
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</code></pre>
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<h1 id="different-routers">Different Routers</h1>
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<p>Reitit ships with several different implementations for the <code>Router</code> protocol, originally based on the awesome <a href="https://github.com/pedestal/pedestal/tree/master/route" target="_blank">Pedestal</a> implementation. <code>router</code> selects the most suitable implementation by inspecting the expanded routes. The implementation can be set manually using <code>:router</code> ROUTER OPTION.</p>
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<table>
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<thead>
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<tr>
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<th>router</th>
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<th>description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>:linear-router</code></td>
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<td>Matches the routes one-by-one starting from the top until a match is found. Works with any kind of routes.</td>
|
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</tr>
|
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<tr>
|
|
<td><code>:lookup-router</code></td>
|
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<td>Fastest router, uses hash-lookup to resolve the route. Valid if no paths have path or catch-all parameters.</td>
|
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</tr>
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<tr>
|
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<td><code>:mixed-router</code></td>
|
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<td>Creates internally a <code>:linear-router</code> and a <code>:lookup-router</code> and used them to effectively get best-of-both-worlds. Valid if there are no CONFLICTING ROUTES.</td>
|
|
</tr>
|
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<tr>
|
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<td><code>:prefix-tree-router</code></td>
|
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<td><a href="https://github.com/julienschmidt/httprouter#how-does-it-work" target="_blank">TODO</a></td>
|
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</tr>
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</tbody>
|
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</table>
|
|
<p>The router name can be asked from the router</p>
|
|
<pre><code class="lang-clj">(<span class="hljs-name">r/router-name</span> router)
|
|
<span class="hljs-comment">; :mixed-router</span>
|
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</code></pre>
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gitbook.page.hasChanged({"page":{"title":"Route syntax","level":"1.2.1","depth":2,"next":{"title":"Router","level":"1.2.2","depth":2,"anchor":"#router","path":"basics.md","ref":"basics.md#router","articles":[]},"previous":{"title":"Basics","level":"1.2","depth":1,"ref":"","articles":[{"title":"Route syntax","level":"1.2.1","depth":2,"anchor":"#route-syntax","path":"basics.md","ref":"basics.md#route-syntax","articles":[]},{"title":"Router","level":"1.2.2","depth":2,"anchor":"#router","path":"basics.md","ref":"basics.md#router","articles":[]},{"title":"Path-based Routing","level":"1.2.3","depth":2,"anchor":"#path-based-routing","path":"basics.md","ref":"basics.md#path-based-routing","articles":[]},{"title":"Name-based Routing","level":"1.2.4","depth":2,"anchor":"#name-based-routing","path":"basics.md","ref":"basics.md#name-based-routing","articles":[]},{"title":"Route data","level":"1.2.5","depth":2,"anchor":"#route-data","path":"basics.md","ref":"basics.md#route-data","articles":[]},{"title":"Different Routers","level":"1.2.6","depth":2,"anchor":"#different-routers","path":"basics.md","ref":"basics.md#different-routers","articles":[]}]},"dir":"ltr"},"config":{"plugins":["editlink","github","highlight"],"root":"doc","styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"pluginsConfig":{"editlink":{"label":"Edit This Page","multilingual":false,"base":"https://github.com/metosin/reitit/tree/master/doc"},"github":{"url":"https://github.com/metosin/reitit"},"highlight":{},"search":{},"lunr":{"maxIndexSize":1000000,"ignoreSpecialCharacters":false},"sharing":{"facebook":true,"twitter":true,"google":false,"weibo":false,"instapaper":false,"vk":false,"all":["facebook","google","twitter","weibo","instapaper"]},"fontsettings":{"theme":"white","family":"sans","size":2},"theme-default":{"styles":{"website":"styles/website.css","pdf":"styles/pdf.css","epub":"styles/epub.css","mobi":"styles/mobi.css","ebook":"styles/ebook.css","print":"styles/print.css"},"showLevel":false}},"theme":"default","pdf":{"pageNumbers":true,"fontSize":12,"fontFamily":"Arial","paperSize":"a4","chapterMark":"pagebreak","pageBreaksBefore":"/","margin":{"right":62,"left":62,"top":56,"bottom":56}},"structure":{"langs":"LANGS.md","readme":"README.md","glossary":"GLOSSARY.md","summary":"SUMMARY.md"},"variables":{},"gitbook":"*"},"file":{"path":"basics.md","mtime":"2017-09-18T05:30:25.732Z","type":"markdown"},"gitbook":{"version":"3.2.3","time":"2017-09-18T05:30:51.447Z"},"basePath":".","book":{"language":""}});
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