Rust Driver, serialize enum into text

[Guy]

Originally from the User Slack

@Mattia: Is there a straightforward way to serialize a Rust enum into a text inside scylla? Since we can not just derive the macro

@Mattia:

    impl SerializeValue for MyCustomEnum {
        fn serialize<'b>(
            &self,
            typ: &scylla::cluster::metadata::ColumnType,
            writer: scylla::serialize::writers::CellWriter<'b>,
        ) -> Result<
            scylla::serialize::writers::WrittenCellProof<'b>,
            scylla::errors::SerializationError,
        > {
            let s = self.to_string();
            <String as SerializeValue>::serialize(&s, typ, writer)
        }
    }

Does this makes sense? When MyCustomEnum also implements Display

@Karol_Baryła: This impl looks correct. You could possibly avoid the allocation caused by creating a String , but its hard to tell without seeing more of your code.

@Mattia: I have standard enums like so:

enum Foo {
  Bar,
  ..,
}

Do you have any pointer on how I could avoid the allocation?

@Karol_Baryła: Can’t you implement as_str method, returning a string literal different for each case? I don’t see why you need a String.

@Mattia: You’re right, thanks for the heads up