Figured it out! My approach was to use keyValuePairs, but instead of
defining one Decoder, I defined oneOf Decoder-s with one Decoder a and one
succeed. This way I will get default value returned for count, which
represents no problem in the end, and actual values retuned by Decoder a.
Once mixing them up it should work properly.
-- Code:
import Json.Decode exposing (..)
-- empty list is returned because I care about List String values, not Int
and empty list
-- will make no difference
keyValuePairs (oneOf [ decoder , succeed [] ])
Dne sreda, 20. julij 2016 14.41.09 UTC+2 je oseba Matic Zavadlal napisala:
>
> Hi!
>
> I am trying to resolve some json data, whose structure looks like this:
>
> {
> "count": Int,
> "a": List String,
> "b": List String,
> "c": List String
> }
>
> So, as you see, one variable has type of Int and all the others have the
> same type, in this example it's a list string.
> Because number of "other" variables differs I can't use objectN decoder to
> resolve this. I tried with keyValuePairs
> combined with oneOf, but because oneOf takes list as an argument Decoders
> of list value type and value type can't be
> combined.
>
> How should I solve this?
>
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