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99 lines
3 KiB
Markdown
99 lines
3 KiB
Markdown
# Route Data
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Route data is the heart of this library. Routes can have any data attachted to them. Data is interpeted either by the client application or the `Router` via it's `:coerce` and `:compile` hooks. This enables co-existence of both [adaptive and principled](https://youtu.be/x9pxbnFC4aQ?t=1907) components.
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Routes can have a non-sequential route argument that is expanded into route data map when a router is created.
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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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(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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; :params {}
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; :path "/ping"}
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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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; :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, `reitit/Expand` protocol is used to expand the route arguments. It expands keywords into `:name` and functions into `:handler` key in the route data map. It's easy to add custom expanders and one can chenge the whole expand implementation via [router options](../advanced/configuring_routers.md).
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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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(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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(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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; :params {}
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; :path "/ping"}
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```
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