[Nix-dev] concatAttrs :: [attrSet] -> attrSet ?

Volth volth at volth.com
Mon May 29 14:29:54 CEST 2017


there is also lib.mkMerge to handle nested attrs

On 5/29/17, Domen Kožar <domen at dev.si> wrote:
> Note that this will fail if you'll nest the attributes, one will override
> the other.
>
> nix-repl> :p concatAttrs [ {x={a =3;};} {x={ b= 4;};} ]
> { x = { b = 4; }; }
>
>
> On Sun, May 28, 2017 at 5:23 PM, Sergiu Ivanov <sivanov at colimite.fr> wrote:
>
>> Hey Leo,
>>
>> Thus quoth  Leo Gaspard  at 13:05 on Sun, May 28 2017:
>> > On 05/28/2017 02:58 PM, Sergiu Ivanov wrote:
>> >> My use case is quite specific. I do this, approximately:
>> >>
>> >>   let func name = { "${name}" = something name; };
>> >>   in concatAttrs (map func [ "name1" "name2" ])
>> >
>> > If this is your use case, you could also be interested in `genAttrs`
>> > defined in `lib/attrsets.nix` ;)
>>
>> Excellent!  Worked like a charm, thanks a lot!  (After I realised I had
>> to use it like pkgs.lib.genAttrs in my context :-) )
>>
>> --
>> Sergiu
>>
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>>
>


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