Whoops… that's missing an all important (merge (into {} top)).
On Thursday, 16 January 2014 14:36:45 UTC, James wrote:
>
> Thanks for the pointers. I've gotten as far as grouping the keys by the
> prefix using `group-by`, and added clunky support for keys that aren't
> nested like so:
>
> ``` clj
> (defn- nested-key [k]
> (some-> (re-matches #"^(.*)--(.*)$" (name k))
> second
> keyword))
>
> (defn nest-relations
> "Walks the given hash-map, and moves any keys of the form
> <group>--<key> into a nested hash-map."
> [m]
> (let [grouped (group-by (fn [[k _]] (or (nested-key k) ::top)) m)
> top (::top grouped)]
> (-> grouped
> (dissoc ::top)
> (merge top))))
> ```
>
> I end up with vectors instead of hash-maps, and I'm particularly happy
> with the code, but it's getting there.
>
> On Thursday, 16 January 2014 13:58:45 UTC, Jim foo.bar wrote:
>>
>> You could do something like this:
>>
>>
>> (def v {:a--id 1 :a--name "A" :b--id 2 :b--name "B"})
>>
>> (group-by #(-> % first str second str keyword) v)
>>
>> =>{:b [[:b--name "B"] [:b--id 2]], :a [[:a--id 1] [:a--name "A"]]}
>>
>> (reduce-kv #(assoc % %2 (into {} %3)) {} *1)
>>
>> => {:a {:a--id 1, :a--name "A"}, :b {:b--name "B", :b--id 2}}
>>
>> all that's left is the names in the inner map...
>>
>> HTH,
>>
>> Jim
>>
>>
>> On 16/01/14 13:46, James Conroy-Finn wrote:
>> > Hello all,
>> >
>> > I've found myself stuck trying to move matching keys in a hash into a
>> > nested hash.
>> >
>> > For example,:
>> >
>> > {:a--id 1 :a--name "A" :b--id 2 :b--name "B"} ;=> {:a {:id 1 :name
>> > "A"} :b {:id 2 :name "B"}}
>> >
>> > I've tried `clojure.walk`, I've tried building the args to `assoc-in`,
>> > and using `apply`. I honestly feel like I'm missing something really
>> > obvious, like something with group-by.
>> >
>> > Any tips would be greatly appreciated. I'll keep hammering away.
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>
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