Unnecessary being that deserialization ismore than a switch on the type.
The Union approach also puts all the fields on one object, as opposed to
separating by the type field - this is what I wanted to confirm as
unsupported by protobuf.
On Tue, May 10, 2016, 10:22 Tim Kientzle <t...@kientzle.com> wrote:
> I’m not sure what you think is “unnecessary”.
>
> Are you trying to avoid actually declaring the types of a, b, c, d, etc?
>
> If so, you could use google.protobuf.Struct (which can parse a JSON object
> in a generic way without requiring you to create a .proto at all) or any of
> a number of other popular JSON parsing libraries.
>
> But if you want the type-safety that protobuf provides, then you have to
> actually tell the protoc compiler the type of every field. In return, you
> can skip a lot of checking in your code.
>
> Cheers,
>
> Tim
>
> > On May 10, 2016, at 7:08 AM, Marco <a.f.ma...@gmail.com> wrote:
> >
> > That does work, but it seems like it creates a lot of unnecessary work
> if there are many fields.
> >
> > Is there a better way to handle a schema more like this?
> >
> > { type: "error", message: "wrong"} or { type:"ok", a: 1, b:2, c:3, d:4,
> ... }.
> >
> > On Monday, May 9, 2016 at 3:12:19 PM UTC-4, Feng Xiao wrote:
> >
> >
> > On Fri, May 6, 2016 at 8:18 PM, Marco <a.f....@gmail.com> wrote:
> > I'm looking to generate de/serialization for json tagged union messages
> from an external rest api, eg.
> > { type: "error", message: "wrong"} or { type:"ok", response: { a: 1, b:
> 2}}.
> >
> > Reading the docs it seems like an any valued field the type field
> modified json_name would work similarly, although this isn't supported.
> >
> > Is there an existing .proto message that would map to those messages?
> Perhaps with some annotation to this more obvious schema, or being able to
> specify a custom tag to determine which case of a oneof is in use (instead
> of the default enum value)?
> > How about something like:
> >
> > message Response {
> > string type = 1;
> > message Content {
> > int32 a = 1;
> > int32 b = 2;
> > }
> > oneof OneofResponse {
> > string message = 2;
> > Content response = 3;
> > }
> > }
> >
> > ?
> >
> > message Error {
> > string message = 1;
> > }
> >
> > message Second {
> > int64 response = 1;
> > }
> >
> > message MyUnion {
> > oneof Either {
> > Error err = 1;
> > Ok ok = 2;
> > }
> > }
> >
> >
> >
> >
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