[Ur] JSON web service/api?

[Artyom Shalkhakov]

2017-03-09 11:49 GMT+06:00 Isaac Torbett <izacht13 at gmail.com>:
> So with no reflection in urweb (I'm guessing) a JSON serializer needs to be
> given field names? If I am understanding this correctly.
>

Yes, precisely, there's no reflection in Ur/Web! At runtime, there may
not even be records in some cases (where in source code you'd have
some computation with records), I guess.

> On Mar 9, 2017 12:00 AM, "Artyom Shalkhakov" <artyom.shalkhakov at gmail.com>
> wrote:
>>
>> Hello Isaac,
>>
>> 2017-03-09 0:51 GMT+06:00 Isaac Torbett <izacht13 at gmail.com>:
>> > I'm trying to get the urweb server to return json, but what is the
>> > type/kind
>> > I should put in the transaction monad?
>> >
>> >
>> > val main : <here> -> transaction page
>> >
>> >
>> > What would I put in <here>?
>> >
>>
>> You should put [unit] (which is the same as {} aka the empty record).
>> The expression of this type would be () (empty parens), so you can
>> write:
>>
>> > fun main () = ... (* some code *)
>>
>> You could also write:
>>
>> > fun main (_ : unit) =  ... (* some code *)
>>
>> which means there is no pattern matching involved. There's only one
>> element in type unit, and it's (). So it doesn't make much sense to
>> pattern-match on it, but we still do it, presumably to let the type
>> inference work out its type for us. :-)
>>
>> > Furthermore- I don't even know if my json-like structure is allowed, the
>> > compiler isn't complaining about it, so maybe it's fine.
>> >
>>
>> To return JSON instead of HTML, you will have to write something along
>> the lines of:
>>
>> > fun main () =
>> > let
>> >   val myJSON = "{\"foo\": 1}" (* the JSON, serialized as a string *)
>> > in
>> >   returnBlob (textBlob myJSON) (blessMime "application/json")
>> > end
>>
>> And also, add this to your .urp file:
>>
>> > allow mime application/json
>>
>> To *produce* JSON (serialized to a string), you can use the JSON
>> library, which is part of the Ur/Web distribution.
>>
>> I was planning on writing an article detailing how to create a simple
>> "modern" CRUD app in Ur/Web, that works very similarly to what you can
>> write with Angular, OpenUI5 or React. Stay tuned.
>>
>> Using Ur/Web for creating a lightweight web service is also a
>> possibility. You can even run it on your smart toaster! :-)
>>
>> >
>> > fun main () = return queryX1 (SELECT topic.Title, topic.Body FROM topic)
>> >
>> >
>> > I'm not even sure I know what I'm doing, `completely new to ML-style
>> > languages.
>> >
>> > - Isaac
>> >
>> > P.S. I've never actually used a Mailing List before, so if my post is
>> > malformed, please tell me.
>> >
>> > _______________________________________________
>> > Ur mailing list
>> > Ur at impredicative.com
>> > http://www.impredicative.com/cgi-bin/mailman/listinfo/ur
>> >
>>
>>
>>
>> --
>> Cheers,
>> Artyom Shalkhakov
>>
>> _______________________________________________
>> Ur mailing list
>> Ur at impredicative.com
>> http://www.impredicative.com/cgi-bin/mailman/listinfo/ur
>
>
> _______________________________________________
> Ur mailing list
> Ur at impredicative.com
> http://www.impredicative.com/cgi-bin/mailman/listinfo/ur
>



-- 
Cheers,
Artyom Shalkhakov