Thanks Duane, but I don't see how your suggestion fixes my problem.
My goal is to manipulate a single string variable, call it "theJson", into
an Elm list of records so that I can operate on it as I would any other
list of records in Elm.
So far I believe this cannot be done because Elm doesn't allow record
fields to be added at run time. Previously Elm had the capability of doing
this, but it was recently removed.
Is my research accurate? I have a number of applications where I must do
this type of thing, and I believe this is a common enough use-case that the
Elm creators would want to support it.
Thanks!
On Saturday, July 30, 2016 at 4:24:43 PM UTC-5, Duane Johnson wrote:
>
> Yes, if you keep the objects in the Json.Encode.Value type, then you can
> contain a tree of arbitrary JSON types all the way down.
>
> This helped me understand the above Json.Encode.Value type a little bit
> better:
>
> $ elm repl
>
> > import Json.Encode
> > Json.Encode.string "hi"
> "hi" : Json.Encode.Value
> > Json.Encode.list []
> {} : Json.Encode.Value
> > Json.Encode.list [Json.Encode.string "hi"]
> { 0 = "hi" } : Json.Encode.Value
> > Json.Encode.object [("hi", Json.Encode.int 1), ("bye", Json.Encode.list
> [Json.Encode.int 1, Json.Encode.int 2])]
> { hi = 1, bye = { 0 = 1, 1 = 2 } } : Json.Encode.Value
>
> So basically, you can keep encoding things as this generic
> "Json.Encode.Value" type, and nesting them inside one another. From Elm's
> perspective, they're all the same type, so where javascript arrays could
> have multiple things in them (e.g. ["one", 2, {3: "four"}]) Elm is ok with
> a list of single-type things.
>
>
> On Sat, Jul 30, 2016 at 3:15 PM, Gary Young <[email protected]
> <javascript:>> wrote:
>
>> Hi guys,
>>
>> I have a reporting app where actions by the user generate arbitrary lists
>> of objects(records) coming back from a JSON store. I do not know at
>> compile time what the fields in the objects(records) will be. Can Elm do
>> this? How?
>>
>> Thanks in advance!
>>
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