Find a way to use the provided Schema when using "the serde way"

[martin-g]

See

avro-rs/avro/src/schema.rs

Lines 6446 to 6482 in d6a1e4f

	#[test]
	fn avro_rs_53_uuid_with_fixed() -> TestResult {
	#[derive(Debug, Serialize, Deserialize)]
	struct Comment {
	id: crate::Uuid,
	}
	impl AvroSchema for Comment {
	fn get_schema() -> Schema {
	Schema::parse_str(
	r#"{
	"type" : "record",
	"name" : "Comment",
	"fields" : [ {
	"name" : "id",
	"type" : {
	"type" : "fixed",
	"size" : 16,
	"logicalType" : "uuid",
	"name": "FixedUUID"
	}
	} ]
	}"#,
	)
	.expect("Invalid Comment Avro schema")
	}
	}
	let payload = Comment {
	id: "de2df598-9948-4988-b00a-a41c0e287398".parse()?,
	};
	let mut buffer = Vec::new();
	SpecificSingleObjectWriter::<Comment>::with_capacity(10)?
	.write_ref(&payload, &mut buffer)?;
	Ok(())
	}

Here the test uses

 SpecificSingleObjectWriter::<Comment>::with_capacity(10)?
            .write_ref(&Comment {id: "de2df598-9948-4988-b00a-a41c0e287398".parse()?}, &mut buffer)?;

The Avro Schema is available via Comment::get_schema() but it is not used at

avro-rs/avro/src/writer.rs

Lines 551 to 555 in d6a1e4f

	pub fn write_ref<W: Write>(&mut self, data: &T, writer: &mut W) -> AvroResult<usize> {
	let mut serializer = Serializer::default();
	let v = data.serialize(&mut serializer)?;
	self.inner.write_value_ref(&v, writer)
	}

because Serde does not work with schemas.

We need to find a way to make use of the schema because now the id struct field is serialized/encoded as a types::Value::String instead of Uuid or even Fixed(16), as defined in the schema.