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95 lines
3 KiB
Markdown
95 lines
3 KiB
Markdown
# Route Data
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Route data is the core feature of reitit. Routes can have any map-like data attached to them. This data is interpreted either by the client application or the `Router` via its `:coerce` and `:compile` hooks. Route data format can be defined and validated with `clojure.spec` enabling a architecture of both [adaptive and principled](https://youtu.be/x9pxbnFC4aQ?t=1907) components.
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Raw routes can have a non-sequential route argument that is expanded (via router `:expand` hook) into route data at router creation time. By default, Keywords are expanded into `:name` and functions into `:handler` keys.
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```clj
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(require '[reitit.core :as r])
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(def router
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(r/router
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[["/ping" ::ping]
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["/pong" identity]
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["/users" {:get {:roles #{:admin}
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:handler identity}}]]))
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```
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The expanded route data can be retrieved from a router with `routes` and is returned with `match-by-path` and `match-by-name` in case of a route match.
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```clj
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(r/routes router)
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; [["/ping" {:name :user/ping}]
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; ["/pong" {:handler identity]}
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; ["/users" {:get {:roles #{:admin}
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; :handler identity}}]]
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```
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```clj
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(r/match-by-path router "/ping")
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; #Match{:template "/ping"
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; :data {:name :user/ping}
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; :result nil
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; :path-params {}
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; :path "/ping"}
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```
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```clj
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(r/match-by-name router ::ping)
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; #Match{:template "/ping"
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; :data {:name :user/ping}
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; :result nil
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; :path-params {}
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; :path "/ping"}
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```
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## Nested route data
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For nested route trees, route data is accumulated recursively from root towards leafs using [meta-merge](https://github.com/weavejester/meta-merge). Default behavior for colections is `:append`, but this can be overridden to `:prepend`, `:replace` or `:displace` using the target meta-data.
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An example router with nested data:
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```clj
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(def router
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(r/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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```
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Resolved route tree:
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```clj
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(r/routes router)
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; [["/api/ping" {:interceptors [::api]
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; :name :user/ping}]
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; ["/api/admin/users" {:interceptors [::api]
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; :roles #{:admin}
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; :name ::users} nil]
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; ["/api/admin/db" {:interceptors [::api ::db]
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; :roles #{:db-admin}}]]
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```
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## Expansion
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By default, router `:expand` hook maps to `reitit.core/expand` function, backed by a `reitit.core/Expand` protocol. One can provide either a totally different function or add new implementations to that protocol. Expand implementations can be recursive.
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Naive example to add direct support for `java.io.File` route argument:
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```clj
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(extend-type java.io.File
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r/Expand
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(expand [file options]
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(r/expand
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#(slurp file)
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options)))
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(r/router
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["/" (java.io.File. "index.html")])
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```
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See [router options](../advanced/configuring_routers.md) for all available options.
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