message Person {
required Empid = 1 [default = 100];
required string name = 2 [default = "Raju"];
optional string occupation = 3;
repeated string snippets = 4;
}
Can I give the default values as mentioned above?
2 Answers
For proto3, custom default values are disallowed.
3 Comments
ch271828n
If I want custom default values, what should I do?
Noel Yap
@ch271828n, one option could be to use proto2. Another might be to write custom add-ons.
Groostav
can somebody link to the rationale for why it was removed? for the above string field
name, I believe you can differentiate between an explicitly set empty-string and a defaulted empty-string with the (java/grpc --presumably similar on other platforms) hasName() method. Is this the suggested work-around?Update: The below answer is for proto2 only, proto3 doesn't allow custom default values.
Yes, you can give default values as you had written. default is optional for required, but for optional you have to mention the default values else type specific value is automatically assigned. Moreover you forgot to mention the type for Empid.
protobuf language guide states that
If the default value is not specified for an
optionalelement, a type-specific default value is used instead: forstrings, the default value is the empty string. Forbools, the default value is false. For numeric types, the default value is zero. Forenums, the default value is the first value listed in the enum's type definition. This means care must be taken when adding a value to the beginning of an enum value list.
1 Comment
Trevor Hickey
To clarify, I can not seem to set a different default value for strings. So is that still not possible. They are always just defaulted to empty string?
;on end of theEmpidfield :)