My response had the assumption that this is an example of an X-Y problem
:-).
If you want to literally do what you said, then you can't use update-in
because the value at that point is a seq.
If you have to continue in this way, for some reason, what you probably
want is map-indexed, which provides the index of the element as one of the
parameters to the mapping function.
You could use a helper to build a function that only operates on that
particular element.
I caution that you might run into a stackoverflow due to laziness if you do
this enough without realizing the seq.
This just feels unidiomatic to me, though.
On Tue, Apr 8, 2014 at 7:10 PM, Ivan Schuetz <ivanschu...@gmail.com> wrote:
> As I said I already looked in the docs, and know these basic examples, but
> I don't know how to do:
>
> *"How can I say in a vector of records e.g. "set name of element to "foo"
> where id is equal 1"?"*
>
>
> The remove by Id works, I posted it only to show something which might be
> similar to the update I'm looking for.
>
> I also wrote filter:
>
> (nth (filtered (filter #(= (:id %) id) @dataprovider/products)) 0)
>
> This gives me the element I need to update, but I still don't know how I
> update this element in the vector.
>
>
>
> Am Mittwoch, 9. April 2014 00:27:41 UTC+2 schrieb Gary Trakhman:
>>
>> Maybe this will help:
>>
>> > (update-in [[] 2 3 4] [0] (constantly 1))
>> [1 2 3 4]
>>
>> > (update-in [[] 2 3 4] [2] (constantly 1))
>> [ [ ] 2 1 4]
>>
>> > (update-in [[] 2 3 4] [1] (constantly 1))
>> [ [ ] 1 3 4]
>>
>> > (update-in [[] 2 3 4] [0 :a] (constantly :b))
>> java.lang.IllegalArgumentException: Key must be integer
>>
>> > (update-in [[] 2 3 4] [0 0 :a] (constantly :b))
>> [ [{:a :b}] 2 3 4]
>>
>>
>> On Tue, Apr 8, 2014 at 6:22 PM, Ivan Schuetz <ivans...@gmail.com> wrote:
>>
>>> I would use merge to update the record with the map... but I don't know
>>> how to get it from filter operation. Maybe I should not solve this with
>>> 1-liner.
>>>
>>> Am Mittwoch, 9. April 2014 00:14:09 UTC+2 schrieb Ivan Schuetz:
>>>
>>>> Ahh dataprovider/products should be "items". Forgot to "simplify".
>>>>
>>>>
>>>> Am Mittwoch, 9. April 2014 00:12:48 UTC+2 schrieb Ivan Schuetz:
>>>>>
>>>>> Hi,
>>>>>
>>>>> sorry I don't get it. I just started learning Clojure.
>>>>>
>>>>> I did this to remove element with id 1
>>>>>
>>>>> (commute items #(remove (fn [x](= (:id x) id)) %))
>>>>>
>>>>> From your statement I understand update-in would work for the update,
>>>>> but I don't know the syntax. Something like
>>>>>
>>>>> (commute dataprovider/products #(update-in % {:id id} (->Item
>>>>> ???) ))
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Am Mittwoch, 9. April 2014 00:01:00 UTC+2 schrieb Gary Trakhman:
>>>>>>
>>>>>>
>>>>>>> But 1. Can't find examples with records, 2. Not sure if I can use it
>>>>>>> to update a different field than the one I'm using to do the query. In
>>>>>>> the
>>>>>>> examples fields seem to be the same.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>> Leave off the last path segment and return the full updated record,
>>>>>> not just the new field's value.
>>>>>>
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