martin-g commented on issue #252:
URL: https://github.com/apache/avro-rs/issues/252#issuecomment-3177930184
You could use `#[avro(default = "null")]` on the `subtitle` field.
It will produce a RecordField like:
```
RecordField {
name: "optional",
doc: None,
aliases: None,
default: Some(
String("null"),
),
schema: Union(
UnionSchema {
schemas: [
Null,
String,
],
variant_index: {
Null: 0,
String: 1,
},
},
),
order: Ascending,
position: 7,
custom_attributes: {},
},
```
But as you already figured out the canonical form won't have the `default`
field, so most probably you will still get the same error from the registry.
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