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< a href = ".." > Route Data< / a >
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< h1 id = "route-data" > Route Data< / h1 >
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< p > Route data is the core feature of reitit. Routes can have any map-like data attachted to them. This data is interpeted either by the client application or the < code > Router< / code > via it' s < code > :coerce< / code > and < code > :compile< / code > hooks. Route data format can be defined and validated with < code > clojure.spec< / code > enabling a architecture of both < a href = "https://youtu.be/x9pxbnFC4aQ?t=1907" target = "_blank" > adaptive and principled< / a > components.< / p >
< p > Raw routes can have a non-sequential route argument that is expanded (via router < code > :expand< / code > hook) into route data at router creation time. By default, Keywords are expanded into < code > :name< / code > and functions into < code > :handler< / code > keys.< / 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])
(< span class = "hljs-name" > < span class = "hljs-builtin-name" > def< / span > < / span > router
(< span class = "hljs-name" > r/router< / span >
[[< span class = "hljs-string" > " /ping" < / span > < span class = "hljs-symbol" > ::ping< / span > ]
[< span class = "hljs-string" > " /pong" < / span > identity]
[< span class = "hljs-string" > " /users" < / span > {< span class = "hljs-symbol" > :get< / span > {< span class = "hljs-symbol" > :roles< / span > #{< span class = "hljs-symbol" > :admin< / span > }
< span class = "hljs-symbol" > :handler< / span > identity}}]]))
< / code > < / pre >
< p > The expanded route data can be retrieved from a router with < code > routes< / code > and is returned with < code > match-by-path< / code > and < code > match-by-name< / code > in case of a route match.< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/routes< / span > router)
< span class = "hljs-comment" > ; [[" /ping" {:name :user/ping}]< / span >
< span class = "hljs-comment" > ; [" /pong" {:handler identity]}< / span >
< span class = "hljs-comment" > ; [" /users" {:get {:roles #{:admin}< / span >
< span class = "hljs-comment" > ; :handler identity}}]]< / span >
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< / code > < / pre >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/match-by-path< / span > router < span class = "hljs-string" > " /ping" < / span > )
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< span class = "hljs-comment" > ; #Match{:template " /ping" < / span >
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< span class = "hljs-comment" > ; :data {:name :user/ping}< / span >
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< span class = "hljs-comment" > ; :result nil< / span >
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< span class = "hljs-comment" > ; :path-params {}< / span >
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< span class = "hljs-comment" > ; :path " /ping" }< / span >
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< / code > < / pre >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > r/match-by-name< / span > router < span class = "hljs-symbol" > ::ping< / span > )
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< span class = "hljs-comment" > ; #Match{:template " /ping" < / span >
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< span class = "hljs-comment" > ; :data {:name :user/ping}< / span >
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< span class = "hljs-comment" > ; :result nil< / span >
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< span class = "hljs-comment" > ; :path-params {}< / span >
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< span class = "hljs-comment" > ; :path " /ping" }< / span >
< / code > < / pre >
< h2 id = "nested-route-data" > Nested route data< / h2 >
< p > For nested route trees, route data is accumulated recursively from root towards leafs using < a href = "https://github.com/weavejester/meta-merge" target = "_blank" > meta-merge< / a > . Default behavior for colections is < code > :append< / code > , but this can be overridden to < code > :prepend< / code > , < code > :replace< / code > or < code > :displace< / code > using the target meta-data.< / p >
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< p > An example router with nested data:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > def< / span > < / span > router
(< span class = "hljs-name" > r/router< / span >
[< span class = "hljs-string" > " /api" < / span > {< span class = "hljs-symbol" > :interceptors< / span > [< span class = "hljs-symbol" > ::api< / span > ]}
[< span class = "hljs-string" > " /ping" < / span > < span class = "hljs-symbol" > ::ping< / span > ]
[< span class = "hljs-string" > " /admin" < / span > {< span class = "hljs-symbol" > :roles< / span > #{< span class = "hljs-symbol" > :admin< / span > }}
[< span class = "hljs-string" > " /users" < / span > < span class = "hljs-symbol" > ::users< / span > ]
[< 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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< / code > < / pre >
< p > Resolved route tree:< / 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" {:interceptors [::api]< / span >
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< span class = "hljs-comment" > ; :name :user/ping}]< / span >
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< span class = "hljs-comment" > ; [" /api/admin/users" {:interceptors [::api]< / span >
< span class = "hljs-comment" > ; :roles #{:admin}< / span >
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< span class = "hljs-comment" > ; :name ::users} nil]< / span >
< span class = "hljs-comment" > ; [" /api/admin/db" {:interceptors [::api ::db]< / span >
< span class = "hljs-comment" > ; :roles #{:db-admin}}]]< / span >
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< / code > < / pre >
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< h2 id = "expansion" > Expansion< / h2 >
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< p > By default, router < code > :expand< / code > hook maps to < code > reitit.core/expand< / code > function, backed by a < code > reitit.core/Expand< / code > protocol. One can provide either a totally different function or add new implementations to that protocol. Expand implementations can be recursive.< / p >
< p > Naive example to add direct support for < code > java.io.File< / code > route argument:< / p >
< pre > < code class = "lang-clj" > (< span class = "hljs-name" > < span class = "hljs-builtin-name" > extend-type< / span > < / span > java.io.File
r/Expand
(< span class = "hljs-name" > expand< / span > [file options]
(< span class = "hljs-name" > r/expand< / span >
#(< span class = "hljs-name" > < span class = "hljs-builtin-name" > slurp< / span > < / span > file)
options)))
(< span class = "hljs-name" > r/router< / span >
[< span class = "hljs-string" > " /" < / span > (< span class = "hljs-name" > java.io.File.< / span > < span class = "hljs-string" > " index.html" < / span > )])
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< / code > < / pre >
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< p > See < a href = "../advanced/configuring_routers.html" > router options< / a > for all available options.< / p >
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< script src = "../gitbook/gitbook-plugin-lunr/search-lunr.js" > < / script >
< script src = "../gitbook/gitbook-plugin-sharing/buttons.js" > < / script >
< script src = "../gitbook/gitbook-plugin-fontsettings/fontsettings.js" > < / script >
< / body >
< / html >
