Looks like I found the solution in
https://golang.org/pkg/encoding/json/#Decoder.Decode
Example (Stream).
This should do it.
On Tuesday, December 19, 2017 at 11:11:25 AM UTC-5, Tad Vizbaras wrote:
>
>
> I have this:
>
> type Runner interface {
> TaskName() string
> Run(ctx context.Context) error
> }
>
> type Job struct {
> Tasks []Runner
> }
>
> 1. I have number of structs that implement Runner interface and get added
> into slice of Tasks.
>
> 2. I use json.Encoder to save Job into JSON file.
>
> 3. But when I try to load JSON back via json.Decoder I get error:
> "json: cannot unmarshal object into Go struct field Job.Tasks of type
> serv.Runner"
> I guess unmarshaller does not have enough information in saved JSON to
> restore specific
> structs.
>
> Question: what would be right design decision? Add extra metadata to
> structs that
> implement Runner and restore structs manually via type assertion of
> interface{} during load?
>
> Thanks a lot for any help.
>
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