如何在Clojure/Compojure/Ring中将地图转换为URL查询字符串？

Question

在Clojure/Compojure中,如何将地图转换为URL查询字符串？

{:foo 1 :bar 2 :baz 3}

至

foo=1&bar=2&baz=3

在compojure中有没有任何实用方法呢？

Answer 1

是的,有一个实用程序,它不涉及打嗝或滚动你自己的字符串/ join/URLEncoder函数:

user=> (ring.util.codec/form-encode {:foo 1 :bar 2 :baz 3})
"foo=1&bar=2&baz=3"
user=>

Compojure依赖于ring/ring-core,其中包括ring.util.codec,因此您已经拥有它.

Answer 2

就像是:

(defn params->query-string [m]
     (clojure.string/join "&" (for [[k v] m] (str (name k) "=" v))))

应该这样做......

REPL会议:

user> (defn params->query-string [m]
         (clojure.string/join "&" 
            (for [[k v] m] 
               (str (name k) "="  (java.net.URLEncoder/encode v)))))
#'user/params->query-string
user> (params->query-string {:foo 1 :bar 2 :baz 3})
"foo=1&bar=2&baz=3"
user>