[Feature Request] Giving name for the root compound

[Jroid8]

I have the following struct which represents a schematic

#[derive(Serialize, Deserialize, Debug)]
#[serde(rename_all = "PascalCase")]
pub struct Schematic {
    blocks: ByteArray,
    data: ByteArray,
    tile_entities: Vec<Value>,
    entities: Vec<Value>,
    width: i16,
    height: i16,
    length: i16,
    materials: String,
}

But when I write it into a file I get the following error by WorldEdit "Tag 'Schematic' does not exist or is not first". Opening the file with an NBT Editor it shows me that the root compound's name is empty. Renaming the root compound to "Schematic" in the editor fixes the error. Is there a way to do this with fastnbt?

[Jroid8]

adding

let mut bytes = fastnbt::to_bytes(&structure).unwrap();
bytes.splice(2..=2, b"\x09Schematic".to_owned());
bytes.extend([9,0]);

solved the issue temporarily

[owengage]

Hey, I don't think there's a built in way to do this at the moment. It doesn't neatly fit the serde data model as far I can tell, so it's not super clear how to add this.

Up until now it hasn't been a raised issue. It's good to have a real use for it. I will think on how to add this functionality.

[owengage]

fastnbt 2.5.0 now allows setting this with to_bytes_with_opts and to_writer_with_opts. There's some info in the ser module docs (once docs.rs catches up with 2.5 at least!).

You appear to be writing some bytes to the end of your output in your workaround. As far as I can tell that's not necessary, am I missing something? It's been a while since I took a hard look at NBT's format.

[Jroid8]

I tested it now and it's working! Thank you very much 🌺

You appear to be writing some bytes to the end of your output in your workaround. As far as I can tell that's not necessary, am I missing something? It's been a while since I took a hard look at NBT's format.

I haven't ether so I don't know if it's necessary. I compared the correct schematic's binary with the generated one and saw it