Crate substrate_data_derive 

#[derive(Schema)] — see substrate_data::Schema.

• A struct with named fields is an object. Field attributes: #[data(rename = "name")], #[data(default)] / #[data(default = "path::to_fn")], #[data(skip)] (never read or written; Default). Option fields may be left out.

• A struct with one unnamed field is that field’s format.

• An enum of unit variants is a string: the variant’s name in snake_case, or #[data(rename = "...")].

• #[data(tag = "type")] on an enum: an object whose type names the variant; a variant is a unit, has named fields, or wraps one value — a struct’s fields sit next to the tag, anything else under value (substrate_data::schema::WRAPPED).

• #[data(view)] on a struct: NameView<'a> too, the struct read out of a frame without copying (substrate_data::frame::View).

Every type also packs itself into frames (pack / unpack: fields by position, unit enums by index) and writes the binary form straight (encode / decode).

Doc comments become the shape’s docs (an editor’s hover text and the docs’ field tables).

Derive Macros

Schema

#[derive(Schema)]: see the crate’s docs.