Use proto2, which has the has_* checks per field. (Using get_* you
still get the default value, of course.) It's extremely unfortunate
that this functionality was removed in proto3, I see that making
proto3 unattractive for all but the simplest uses of protos. I know in
almost every protobuf use-case I've had, the presence accessors were
imperative to proper operation.

On Sat, Mar 26, 2016 at 2:43 PM, Yoav H <joe.daily.j...@gmail.com> wrote:
> Hi,
>
> I wanted ask regarding the decision to populate fields with default values,
> even if they do not appear in the encoded message.
> If I want to send a "patch" message, where I want to update just the
> provided fields, how can I do that with protobuf (without adding IsXXXSet
> for every field)?
>
> Why not add another type, representing a default value?
> So the schematics would be, if the field is missing, it is null, and if the
> field exists, but with this "missing value" type, it will get the default
> value?
>
> Thanks,
> Yoav.
>
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