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55 lines
1.9 KiB
Markdown
55 lines
1.9 KiB
Markdown
# Route meta-data
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Routes can have arbitrary meta-data. For nested routes, the meta-data is accumulated from root towards leafs using [meta-merge](https://github.com/weavejester/meta-merge).
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A router based on nested route tree:
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```clj
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(def router
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(reitit/router
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["/api" {:interceptors [::api]}
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["/ping" ::ping]
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["/admin" {:roles #{:admin}}
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["/users" ::users]
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["/db" {:interceptors [::db]
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:roles ^:replace #{:db-admin}}
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["/:db" {:parameters {:db String}}
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["/drop" ::drop-db]
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["/stats" ::db-stats]]]]]))
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```
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Resolved route tree:
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```clj
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(reitit/routes router)
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; [["/api/ping" {:interceptors [::api]
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; :name ::ping}]
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; ["/api/admin/users" {:interceptors [::api]
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; :roles #{:admin}
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; :name ::users}]
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; ["/api/admin/db/:db/drop" {:interceptors [::api ::db]
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; :roles #{:db-admin}
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; :parameters {:db String}
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; :name ::drop-db}]
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; ["/api/admin/db/:db/stats" {:interceptors [::api ::db]
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; :roles #{:db-admin}
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; :parameters {:db String}
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; :name ::db-stats}]]
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```
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Path-based routing:
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```clj
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(reitit/match-by-path router "/api/admin/users")
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; #Match{:template "/api/admin/users"
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; :meta {:interceptors [::api]
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; :roles #{:admin}
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; :name ::users}
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; :result nil
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; :params {}
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; :path "/api/admin/users"}
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```
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On match, route meta-data is returned and can interpreted by the application.
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Routers also support meta-data compilation enabling things like fast [Ring](https://github.com/ring-clojure/ring) or [Pedestal](http://pedestal.io/) -style handlers. Compilation results are found under `:result` in the match. See [configuring routers](#configuring-routers) for details.
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