On Thursday, September 29, 2016 at 2:40:38 PM UTC+1, Rupert Smith wrote:
>
> Some scnearios that would need to be covered:
>
> Optional fields:
>
In one of my json, I have an optional list of 'roles'. This might be the
empty list, it might be an explicit 'null' or might be missing altogether.
To decode this I had to do:
|: (("roles" := maybeNull (Decode.list roleDecoder))
|> withDefault Nothing
)
phew. I suppose I could write my own helper function here called
'maybeNullOrMissing'.
No quotes:
String don't seem to decode without quotes. I had an integer value that I
wanted to just treat as a string, as its an id so I consider it opaque and
for the maximum flexibility just treat it as a string. Since there were no
quotes I had to do this:
|: ("id" := Decode.int |> Decode.map toString)
Which would break if the server ever did return a non-integer string in
quotes.
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