Convert Map to string for use in URL as parameters question
I wanted to take a Map and convert it to a string suitable for use as
parameters in a URL. I have got it working below two different ways
but wondered if there was a better or more idiomatic way to do this.
;; My test input map
(def input {:a 1 :b 2 :c 3 :d 4})
;; What I'd like the input map convert into. A string that looks like
keyword=value&keyword=value&,
(def output "a=1&b=2&c=3&d=4")
;; This function converts each MapEntry to the key=value
(defn map-entry-to-string-pair
"Convert a key value from a map into a string that looks like
key=value.
For example,
(def input {:a 1 :b 2 :c 3 :d 4})
(map-entry-to-string-pair (first input)) => \"a=1\""
[mapentry]
(str (name (first mapentry)) "=" (second mapentry)))
;; The following two functions build the result string. There is not
much of a difference between them. The first uses
;; let to hold a variable after mapping map-entry-to-string-pair over
the input map. The other just uses the same mapping
;; after converting it to a vector.
(defn convert-map-to-url-string1
"Convert a map from keyword values to a string that consists of
keyword=value pairs separated by &s for use in a URL
For example,
(def input {:a 1 :b 2 :c 3 :d 4})
(convert-map-to-url-string1 input) => \"a=1&b=2&c=3&d=4\""
[m]
(let [pairs (map map-entry-to-string-pair m)]
(join "&" pairs)))
(defn convert-map-to-url-string2
"Convert a map from keyword values to a string that consists of
keyword=value pairs separated by &s for use in a URL
For example,
(def input {:a 1 :b 2 :c 3 :d 4})
(convert-map-to-url-string2 input) => \"a=1&b=2&c=3&d=4\""
[m]
(join "&" (vec (map map-entry-to-string-pair m
Is there a simpler, better way to do this?
- Brad
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Re: Convert Map to string for use in URL as parameters question
On Mon, Aug 1, 2011 at 3:47 PM, Brad wrote:
> ;; My test input map
> (def input {:a 1 :b 2 :c 3 :d 4})
...
> Is there a simpler, better way to do this?
How about:
(require '[clojure.string :as str])
(defn map-to-query-string [m]
(str/join "&" (map (fn [[k v]] (str (name k) "=" v)) m)))
--
Sean A Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/
World Singles, LLC. -- http://worldsingles.com/
Railo Technologies, Inc. -- http://www.getrailo.com/
"Perfection is the enemy of the good."
-- Gustave Flaubert, French realist novelist (1821-1880)
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Re: Convert Map to string for use in URL as parameters question
Depending on your input, you might also want to make sure to properly
urlencode the keys and values.
There is a function in hiccup that does what you want (including
urlencoding):
https://github.com/weavejester/hiccup/blob/10c3ebe175edc80eed1a0792ec68036be47940d3/src/hiccup/page_helpers.clj#L117-123
On Tue, Aug 2, 2011 at 12:47 AM, Brad wrote:
> I wanted to take a Map and convert it to a string suitable for use as
> parameters in a URL. I have got it working below two different ways
> but wondered if there was a better or more idiomatic way to do this.
>
> ;; My test input map
> (def input {:a 1 :b 2 :c 3 :d 4})
>
> ;; What I'd like the input map convert into. A string that looks like
> keyword=value&keyword=value&,
> (def output "a=1&b=2&c=3&d=4")
>
> ;; This function converts each MapEntry to the key=value
> (defn map-entry-to-string-pair
> "Convert a key value from a map into a string that looks like
> key=value.
> For example,
>(def input {:a 1 :b 2 :c 3 :d 4})
>(map-entry-to-string-pair (first input)) => \"a=1\""
> [mapentry]
> (str (name (first mapentry)) "=" (second mapentry)))
>
>
> ;; The following two functions build the result string. There is not
> much of a difference between them. The first uses
> ;; let to hold a variable after mapping map-entry-to-string-pair over
> the input map. The other just uses the same mapping
> ;; after converting it to a vector.
>
> (defn convert-map-to-url-string1
> "Convert a map from keyword values to a string that consists of
> keyword=value pairs separated by &s for use in a URL
> For example,
>(def input {:a 1 :b 2 :c 3 :d 4})
>(convert-map-to-url-string1 input) => \"a=1&b=2&c=3&d=4\""
> [m]
> (let [pairs (map map-entry-to-string-pair m)]
>(join "&" pairs)))
>
> (defn convert-map-to-url-string2
> "Convert a map from keyword values to a string that consists of
> keyword=value pairs separated by &s for use in a URL
> For example,
>(def input {:a 1 :b 2 :c 3 :d 4})
>(convert-map-to-url-string2 input) => \"a=1&b=2&c=3&d=4\""
> [m]
> (join "&" (vec (map map-entry-to-string-pair m
>
>
> Is there a simpler, better way to do this?
>
> - Brad
>
> --
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> your first post.
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Re: Convert Map to string for use in URL as parameters question
Thanks. This is much more succinct.
On Aug 2, 12:19 am, Sean Corfield wrote:
> On Mon, Aug 1, 2011 at 3:47 PM, Brad wrote:
> > ;; My test input map
> > (def input {:a 1 :b 2 :c 3 :d 4})
> ...
> > Is there a simpler, better way to do this?
>
> How about:
>
> (require '[clojure.string :as str])
>
> (defn map-to-query-string [m]
> (str/join "&" (map (fn [[k v]] (str (name k) "=" v)) m)))
> --
> Sean A Corfield -- (904) 302-SEAN
> An Architect's View --http://corfield.org/
> World Singles, LLC. --http://worldsingles.com/
> Railo Technologies, Inc. --http://www.getrailo.com/
>
> "Perfection is the enemy of the good."
> -- Gustave Flaubert, French realist novelist (1821-1880)
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Re: Convert Map to string for use in URL as parameters question
Great. Encoding the parameters was the next thing to figure out.
Thank you.
On Aug 2, 12:51 am, Matjaz Gregoric wrote:
> Depending on your input, you might also want to make sure to properly
> urlencode the keys and values.
> There is a function in hiccup that does what you want (including
> urlencoding):
>
> https://github.com/weavejester/hiccup/blob/10c3ebe175edc80eed1a0792ec...
>
> On Tue, Aug 2, 2011 at 12:47 AM, Brad wrote:
> > I wanted to take a Map and convert it to a string suitable for use as
> > parameters in a URL. I have got it working below two different ways
> > but wondered if there was a better or more idiomatic way to do this.
>
> > ;; My test input map
> > (def input {:a 1 :b 2 :c 3 :d 4})
>
> > ;; What I'd like the input map convert into. A string that looks like
> > keyword=value&keyword=value&,
> > (def output "a=1&b=2&c=3&d=4")
>
> > ;; This function converts each MapEntry to the key=value
> > (defn map-entry-to-string-pair
> > "Convert a key value from a map into a string that looks like
> > key=value.
> > For example,
> > (def input {:a 1 :b 2 :c 3 :d 4})
> > (map-entry-to-string-pair (first input)) => \"a=1\""
> > [mapentry]
> > (str (name (first mapentry)) "=" (second mapentry)))
>
> > ;; The following two functions build the result string. There is not
> > much of a difference between them. The first uses
> > ;; let to hold a variable after mapping map-entry-to-string-pair over
> > the input map. The other just uses the same mapping
> > ;; after converting it to a vector.
>
> > (defn convert-map-to-url-string1
> > "Convert a map from keyword values to a string that consists of
> > keyword=value pairs separated by &s for use in a URL
> > For example,
> > (def input {:a 1 :b 2 :c 3 :d 4})
> > (convert-map-to-url-string1 input) => \"a=1&b=2&c=3&d=4\""
> > [m]
> > (let [pairs (map map-entry-to-string-pair m)]
> > (join "&" pairs)))
>
> > (defn convert-map-to-url-string2
> > "Convert a map from keyword values to a string that consists of
> > keyword=value pairs separated by &s for use in a URL
> > For example,
> > (def input {:a 1 :b 2 :c 3 :d 4})
> > (convert-map-to-url-string2 input) => \"a=1&b=2&c=3&d=4\""
> > [m]
> > (join "&" (vec (map map-entry-to-string-pair m
>
> > Is there a simpler, better way to do this?
>
> > - Brad
>
> > --
> > You received this message because you are subscribed to the Google
> > Groups "Clojure" group.
> > To post to this group, send email to clojure@googlegroups.com
> > Note that posts from new members are moderated - please be patient with
> > your first post.
> > To unsubscribe from this group, send email to
> > clojure+unsubscr...@googlegroups.com
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Re: Convert Map to string for use in URL as parameters question
On 2 авг, 04:47, Brad wrote:
> I wanted to take a Map and convert it to a string suitable for use as
> parameters in a URL. I have got it working below two different ways
> but wondered if there was a better or more idiomatic way to do this.
>
> ;; My test input map
> (def input {:a 1 :b 2 :c 3 :d 4})
>
> ;; What I'd like the input map convert into. A string that looks like
> keyword=value&keyword=value&,
> (def output "a=1&b=2&c=3&d=4")
>
> ;; This function converts each MapEntry to the key=value
> (defn map-entry-to-string-pair
> "Convert a key value from a map into a string that looks like
> key=value.
> For example,
> (def input {:a 1 :b 2 :c 3 :d 4})
> (map-entry-to-string-pair (first input)) => \"a=1\""
> [mapentry]
> (str (name (first mapentry)) "=" (second mapentry)))
>
> ;; The following two functions build the result string. There is not
> much of a difference between them. The first uses
> ;; let to hold a variable after mapping map-entry-to-string-pair over
> the input map. The other just uses the same mapping
> ;; after converting it to a vector.
>
> (defn convert-map-to-url-string1
> "Convert a map from keyword values to a string that consists of
> keyword=value pairs separated by &s for use in a URL
> For example,
> (def input {:a 1 :b 2 :c 3 :d 4})
> (convert-map-to-url-string1 input) => \"a=1&b=2&c=3&d=4\""
> [m]
> (let [pairs (map map-entry-to-string-pair m)]
> (join "&" pairs)))
>
> (defn convert-map-to-url-string2
> "Convert a map from keyword values to a string that consists of
> keyword=value pairs separated by &s for use in a URL
> For example,
> (def input {:a 1 :b 2 :c 3 :d 4})
> (convert-map-to-url-string2 input) => \"a=1&b=2&c=3&d=4\""
> [m]
> (join "&" (vec (map map-entry-to-string-pair m
>
> Is there a simpler, better way to do this?
>
> - Brad
Also, you can use jaco's named routes to do this:
(defroute simple "/foo/bar")
(simple :baz "qux") => "/foo/bar?baz=qux"
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