You can also keep a map between the string form and the reflect.Type to instantiate, something like https://play.golang.org/p/XCfpjQwumkZ
However, the Go proverb is true: "Reflection is never clear" https://go-proverbs.github.io/ On Wed, Mar 28, 2018 at 5:58 AM, <gary.willoug...@victoriaplumb.com> wrote: > Thanks. I read that blog post earlier and presents two different ways of > handling this. Each maintains a list of switch cases and constants > respectively so still not entirely dynamic. > > I'll probably just go with a switch then. > > > On Wednesday, 28 March 2018 13:25:47 UTC+1, Andrei Tudor Călin wrote: >> >> It isn't really possible to do so because there is no nice and type safe >> way of getting from a string in the JSON to a Go type, >> and a value of said type. You must write a little bit of extra code. >> >> This article: http://eagain.net/articles/go-dynamic-json/ presents a >> good approach. >> >> On Wednesday, March 28, 2018 at 1:46:24 PM UTC+2, >> gary.wi...@victoriaplumb.com wrote: >>> >>> Is it possible to unmarshall Json by selecting the struct from a field >>> in the Json? >>> >>> I'm porting some PHP code to Go and this is something I may have to >>> approach differently. >>> Here is the Json: >>> >>> [ >>> { >>> "class": "Domain\\Model\\Message", >>> "skus": [ >>> "FOO1" >>> ], >>> "label": "Lorem", >>> "text": "Lorem ipsum dolor sit amet.", >>> } >>> ] >>> >>> In PHP the above Json is decoded into an associative array and I can use >>> the 'class' field to decode further to an object (dynamically selecting the >>> object using the 'class' value), like this: >>> >>> $obj = $decoded['class']::jsonDeserialize($decoded); >>> >>> >>> assert($obj->label == "Lorem"); >>> >>> So the above really translates to calling the static method on a >>> concrete class, like this: >>> >>> $obj = Domain\\Model\\Message::jsonDeserialize($decoded); >>> >>> Can I do anything similar in Go without using a switch defining separate >>> unmarshalling for each class? >>> >>> -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- Jonathan Yu / *@jawnsy* on LinkedIn <https://linkedin.com/in/jawnsy>, Twitter <https://twitter.com/jawnsy>, GitHub <https://github.com/jawnsy>, Facebook <https://facebook.com/jawnsy> *“Ever tried. Ever failed. No matter. Try again. Fail again. Fail better.”* — Samuel Beckett, Worstward Ho (1983) “In an adaptive environment, winning comes from adapting to change by continuously experimenting and identifying new options more quickly and economically than others. The classical strategist's mantra of sustainable competitive advantage becomes one of serial temporary advantage.” — Navigating the Dozens of Different Strategy Options <https://hbr.org/2015/06/navigating-the-dozens-of-different-strategy-options> (HBR) -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
