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Routes are just data and to do routing, we need a router instance satisfying the reitit.core/Router protocol. Routers are created with reitit.core/router function, taking the raw routes and optionally an options map.

The Router protocol:

(defprotocol Router
  (router-name [this])
  (routes [this])
  (options [this])
  (route-names [this])
  (match-by-path [this path])
  (match-by-name [this name] [this name params]))

Creating a router:

(require '[reitit.core :as r])

(def router
     ["/ping" ::ping]
     ["/user/:id" ::user]]))

Name of the created router:

(r/router-name router)
; :mixed-router

The flattened route tree:

(r/routes router)
; [["/api/ping" {:name :user/ping}]
;  ["/api/user/:id" {:name :user/user}]]

Behind the scenes

When router is created, the following steps are done:

  • route tree is flattened
  • route arguments are expanded (via reitit.core/Expand protocol) and optionally coerced
  • route conflicts are resolved
  • route tree is compiled
  • actual router implementation is selected and created

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