The implementation(s) acts a bit counter-intuitive on non-nested maps:
FAIL in (deep-merge-test) (test.clj:5)
expected: (= (merge {:a 1, :d 1} {:a 2, :c 1}) (deep-merge {:a 1, :d 1} {:a
2, :c 1}))
actual: (not (= {:c 1, :a 2, :d 1} {:a 2, :c 1}))
ERROR in (deep-merge-with-test) (Numbers.java:942)
expected: (= nil (deep-merge-with + nil nil nil))
actual: java.lang.NullPointerException: null
On Wednesday, July 17, 2013 8:53:03 PM UTC+2, JvJ wrote:
>
> By the way, this is already in contrib:
> http://clojuredocs.org/clojure_contrib/clojure.contrib.map-utils/deep-merge-with
>
> On Wednesday, July 17, 2013 5:42:24 AM UTC-7, Chris Gill wrote:
>>
>> Thank you for finding and posting this! Been wracking my brain trying to
>> figure out a good way to do a full map merge
>>
>> On Thursday, April 25, 2013 5:26:53 PM UTC-4, Stuart Sierra wrote:
>>>
>>> Here's a way to do it from the Pedestal demo source
>>> code<https://github.com/pedestal/demo/blob/17eeac7a5e50d31eb81901de465f3f1d863f2f01/hammock-cafe/src/hammock_cafe/config.clj#L37>
>>> :
>>>
>>> (defn deep-merge
>>> "Recursively merges maps. If keys are not maps, the last value wins."
>>> [& vals]
>>> (if (every? map? vals)
>>> (apply merge-with deep-merge vals)
>>> (last vals)))
>>>
>>> -S
>>>
>>>
>>>
>>> On Thursday, April 25, 2013 4:41:33 PM UTC-4, Joachim De Beule wrote:
>>>>
>>>> Hi list,
>>>>
>>>> I was searching for an "easy" way to combined nested maps, e.g. as in
>>>>
>>>> (combine {:foo {:bar "baz"}} {:foo {:x "y"}})
>>>> => {:foo {:bar "baz", :x "y"}}
>>>>
>>>> I would expect that there is some core map operation to do this, but
>>>> neither merge nor unify work as they simply return {:foo {:x "y"}}, and I
>>>> don't see anything else. Am I missing something?
>>>>
>>>> Joachim.
>>>>
>>>
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