Lib.rs

lib.rs:

use polars_serde::de::BorrowedDataFrameDeserializer;

let s1 = Column::new("Ocean".into(), ["Atlantic", "Indian"]);
let s2 = Column::new("Area (km²)".into(), [106_460_000, 70_560_000]);
let df = DataFrame::new(vec![s1, s2]).unwrap();

#[derive(Debug, PartialEq, Deserialize)]
struct Columns<'a> {
    #[serde(borrow, rename = "Ocean")]
    ocean: Vec<&'a str>,
    #[serde(rename = "Area (km²)")]
    area: Vec<u64>,
}

let columns = Columns::deserialize(BorrowedDataFrameDeserializer::columns(&df))?;
assert_eq!(
    columns,
    Columns {
        ocean: vec!["Atlantic", "Indian"],
        area: vec![106_460_000, 70_560_000],
    },
);

#[derive(Debug, PartialEq, Deserialize)]
struct Row<'a> {
    #[serde(rename = "Ocean")]
    ocean: &'a str,
    #[serde(rename = "Area (km²)")]
    area: u64,
}

let rows = Vec::<Row<'_>>::deserialize(BorrowedDataFrameDeserializer::rows(&df))?;
assert_eq!(
    rows,
    [
        Row {
            ocean: "Atlantic",
            area: 106_460_000,
        },
        Row {
            ocean: "Indian",
            area: 70_560_000,
        },
    ],
);