You *can* update this inside the vector, but if you want to key by :id, I
would personally recommend, you put the email data into a map and look it
up by :id, like this:
{1 {:id 1 :email {"a...@mail.com 1}}
2 {:id 2 :email {"d...@mail.com 1}}
3 {:id 3 :email {"g...@mail.com 2}}}
Best,
Alex
On Mon, Jun 3, 2013 at 1:44 PM, Yinka Erinle <yeri...@gmail.com> wrote:
> Thanks Meikel for the prompt reply, that does it.
>
> Please can you elaborate on how I can use the solution below to update a
> particular entry in the vector.
>
> [{:id 1 :email {"a...@mail.com 1}}
> {:id 2 :email {"d...@mail.com 1}}
> {:id 3 :email {"g...@mail.com 2}}]
>
> So I will like to write a function that accepts an id and then updates the
> counter in email section of the given id.
>
> (defn update-counter [x xs]
> (dosync
> (alter result ......
>
> Thanks again for your time.
>
>
> On Monday, June 3, 2013 9:23:47 PM UTC+1, Meikel Brandmeyer (kotarak)
> wrote:
>>
>> Hi,
>>
>> Am Montag, 3. Juni 2013 22:16:54 UTC+2 schrieb Yinka Erinle:
>>>
>>> Given I have the following
>>> (def result (ref [ { :id 1 :emails { "yi...@mail.com" 1}} ] ) )
>>>
>>> I like to alter the result in a transaction to become
>>> [{:id 1 :emails { "yi...@mail.com" 2}}] ; increment the counter from
>>> 1 to 2
>>>
>>> Please can someone provide pointers.
>>>
>>>
>> You can use the uniform update principle to stitch together alter and
>> update-in.
>>
>> (dosync
>> (alter result update-in [0 :emails "a@b.c"] inc))
>>
>> Kind regards
>> Meikel
>>
>>
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