Field options for types

[enzief]

Motivation: allow Scala annotations to be added after type ascription of a message field.

For example, it's impossible to append @nowarn to a deprecated class. We should be able to do this:

message M {
    DeprecatedType the_field = 1 [(scalapb.field).type_annotations = "@nowarn"];
}

to generate

case class M(theField: DeprecatedType @nowarn)

[ak0rz]

Motivation: allow Scala annotations to be added after type ascription of a message field.

For example, it's impossible to append @nowarn to a deprecated class. We should be able to do this:

message M {
    DeprecatedType the_field = 1 [(scalapb.field).type_annotations = "@nowarn"];
}

to generate

case class M(theField: DeprecatedType @nowarn)

First of all, you must use the canonical name for the annotation:

message M {
    DeprecatedType the_field = 1 [(scalapb.field).annotations = "@scala.annotation.nowarn"];
}

secondly, in case of use of deprecated type (scalapb.field).annotations should work fine.

Can you try to reproduce it with canonical annotation name?

[thesamet]

@enzief , see https://scalapb.github.io/docs/customizations#adding-annotations for documentation on (scalapb.field).annotations. It prepends the annotation though so I am not sure if it makes a difference in this case. Another suggestion which may eliminate the need for this in your use case is to compile protos in a seperate subproject for which you ignore its warnings.

[thesamet]

Hi @enzief , were you able to check if the suggestions above work for your use case?

[enzief]

They work. Thank you @thesamet .