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This commit is contained in:
Tommi Reiman 2018-07-25 11:13:25 +03:00
parent 6aa86cd055
commit ef7a91697f
1 changed files with 13 additions and 12 deletions
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25
doc/advanced/composing_routers.md
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@ -20,7 +20,7 @@ It's resolved routes and options:
```clj
(r/routes router)
;[["/foo" {:name :user/foo}]
; ["/bar/:idr" {:name :user/bar}]]
; ["/bar/:id" {:name :user/bar}]]
(r/options router)
;{:lookup #object[...]
@ -133,9 +133,10 @@ As the `Match` contains the route data, we can create a new matching function th
(defn recursive-match-by-path [router path]
(if-let [match (r/match-by-path router path)]
(if-let [subrouter (-> match :data :router)]
(if-let [submatch (recursive-match-by-path subrouter (subs path (str/last-index-of (:template match) "/")))]
(into [match] submatch))
[match])))
(let [subpath (subs path (str/last-index-of (:template match) "/"))]
(if-let [submatch (recursive-match-by-path subrouter subpath)]
(cons match submatch)))
(list match))))
```
With invalid nested path we get now `nil` as expected:
@ -186,15 +187,15 @@ In all the examples above, the routers were created ahead of time, making the wh
First, we need to modify our matching function to support router references:
```clj
(defn- << [x]
(if (instance? clojure.lang.IDeref x) (deref x) x))
(defn- << [x] (if (instance? clojure.lang.IDeref x) (deref x) x))
(defn recursive-match-by-path [router path]
(if-let [match (r/match-by-path (<< router) path)]
(if-let [subrouter (-> match :data :router <<)]
(if-let [submatch (recursive-match-by-path subrouter (subs path (str/last-index-of (:template match) "/")))]
(into [match] submatch))
[match])))
(let [subpath (subs path (str/last-index-of (:template match) "/"))]
(if-let [submatch (recursive-match-by-path subrouter subpath)]
(cons match submatch)))
(list match))))
```
A router that can be updated on demand, for example based on a domain event when a new entry in inserted into a database. We'll wrap the router into a `atom` to achieve this.
@ -213,7 +214,7 @@ Another router, which is re-created on each routing request.
(reify clojure.lang.IDeref
(deref [_]
(r/router
["/duo" (keyword (gensym ""))]))))
["/duo" (keyword (gensym "duo"))]))))
```
Now we can compose the routers into a system-level static root router.
@ -276,10 +277,10 @@ The dynamic routes are re-created on every request:
```clj
(name-path "/dynamic/duo")
; [:other :2390883]
; [:other :duo2390883]
(name-path "/dynamic/duo")
; [:other :2390893]
; [:other :duo2390893]
```
### Performance