Hi Renata,
```
user=> (clojure.pprint/pprint (swap! accounts #(map (fn [a] (if (= (:id a)
"3136860d-ab7f-4814-8f3b-2d18048db9b9") (assoc a :operations :foo) a)) %)))
({:id "7512a15b-0770-4a9b-a74b-389374b46461",
:balance 0.0,
:operations nil,
:blocked false}
{:id "7446cfe6-882c-4f25-bad1-5ed8c9aea994",
:balance 0.0,
:operations nil,
:blocked false}
{:id "3136860d-ab7f-4814-8f3b-2d18048db9b9",
:balance 0.0,
:operations :foo,
:blocked false}
{:id "2dc20615-f1f7-4637-9602-ae9494689166",
:balance 0.0,
:operations nil,
:blocked false}
{:id "c6dccf4a-535c-4eba-8cfc-0554408de8bd",
:balance 0.0,
:operations nil,
:blocked false})
```
Your swapping function will have to be map since you're trying to update
some matching component of a vector. Then you can test if the current item
is your target `(if (= (:id a) …)` at which point you can change it `(assoc
a :operations …)`. Otherwise, you need to return it so you don't lose any
data.
Note that in this case it might make some sense to transform your data to a
map since that allows for simple key lookups and would allow for the use of
`assoc-in`:
```
user=> (clojure.pprint/pprint @accounts)
{"7512a15b-0770-4a9b-a74b-389374b46461"
{:id "7512a15b-0770-4a9b-a74b-389374b46461",
:balance 0.0,
:operations nil,
:blocked false},
"7446cfe6-882c-4f25-bad1-5ed8c9aea994"
{:id "7446cfe6-882c-4f25-bad1-5ed8c9aea994",
:balance 0.0,
:operations nil,
:blocked false},
"3136860d-ab7f-4814-8f3b-2d18048db9b9"
{:id "3136860d-ab7f-4814-8f3b-2d18048db9b9",
:balance 0.0,
:operations nil,
:blocked false},
"2dc20615-f1f7-4637-9602-ae9494689166"
{:id "2dc20615-f1f7-4637-9602-ae9494689166",
:balance 0.0,
:operations nil,
:blocked false},
"c6dccf4a-535c-4eba-8cfc-0554408de8bd"
{:id "c6dccf4a-535c-4eba-8cfc-0554408de8bd",
:balance 0.0,
:operations nil,
:blocked false}}
nil
user=> (clojure.pprint/pprint (swap! accounts #(assoc-in %
["3136860d-ab7f-4814-8f3b-2d18048db9b9" :operations] :bar)))
{"7512a15b-0770-4a9b-a74b-389374b46461"
{:id "7512a15b-0770-4a9b-a74b-389374b46461",
:balance 0.0,
:operations nil,
:blocked false},
"7446cfe6-882c-4f25-bad1-5ed8c9aea994"
{:id "7446cfe6-882c-4f25-bad1-5ed8c9aea994",
:balance 0.0,
:operations nil,
:blocked false},
"3136860d-ab7f-4814-8f3b-2d18048db9b9"
{:id "3136860d-ab7f-4814-8f3b-2d18048db9b9",
:balance 0.0,
:operations :bar,
:blocked false},
"2dc20615-f1f7-4637-9602-ae9494689166"
{:id "2dc20615-f1f7-4637-9602-ae9494689166",
:balance 0.0,
:operations nil,
:blocked false},
"c6dccf4a-535c-4eba-8cfc-0554408de8bd"
{:id "c6dccf4a-535c-4eba-8cfc-0554408de8bd",
:balance 0.0,
:operations nil,
:blocked false}}
```
On Sun, Apr 29, 2018 at 10:12 AM, Axel Katerbau <akater...@gmail.com> wrote:
> Hi Renata,
>
> > How can I update the atom accounts in the field of operations?
> >
> > (def accounts (atom [{:id "7512a15b-0770-4a9b-a74b-389374b46461",
> :balance 0.0, :operations nil, :blocked false}
> > {:id "7446cfe6-882c-4f25-bad1-5ed8c9aea994", :balance 0.0,
> :operations nil, :blocked false}
> > {:id "3136860d-ab7f-4814-8f3b-2d18048db9b9", :balance 0.0,
> :operations nil, :blocked false}
> > {:id "2dc20615-f1f7-4637-9602-ae9494689166", :balance 0.0,
> :operations nil, :blocked false}
> > {:id "c6dccf4a-535c-4eba-8cfc-0554408de8bd", :balance 0.0,
> :operations nil, :blocked false}]))
> >
> > I tried this:
> >
> > (swap! accounts (fn [x] (update-in x [:operations] #(if (= (:id %)
> account-id) new-value))))
> >
> > and returns "key must be integer" because of [:operations]
>
> the atom hold and array of accounts. In swap! you are trying to access one
> (!) value in a key-path [:operations] but access to elements of an array is
> not valid via a key-path but by using indexes.
>
> What you are seemingly trying to do is to map over the contents of the
> array in the atom which is not what you coded here.
>
> - Axel
>
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