Diesel Enum — stderr 2> kbwo.log

まれに書くときに書き方忘れる

ToSqlとFromSqlの実装忘れたらコンパイルとおらない

enum.rs

#[derive(
    Debug,
    Eq,
    PartialEq,
    Clone,
    FromSqlRow,
    AsExpression,
    EnumString,
    Display,
)]
#[diesel(sql_type = EnumTypeInSchema)]
pub enum EnumAB {
    #[strum(serialize = "a")]
    #[serde(rename = "a")]
    A,
    #[strum(serialize = "b")]
    #[serde(rename = "b")]
    B,
}

impl ToSql<EnumTypeInSchema, Mysql> for EnumAB {
    fn to_sql<'b>(&'b self, out: &mut Output<'b, '_, Mysql>) -> serialize::Result {
        out.write_all(self.to_string().as_bytes())?;
        Ok(IsNull::No)
    }
}
impl FromSql<EnumTypeInSchema, Mysql> for EnumAB {
    fn from_sql(bytes: MysqlValue<'_>) -> deserialize::Result<Self> {
        match bytes.as_bytes() {
            b"a" => Ok(EnumAB::A),
            b"b" => Ok(EnumAB::B),
            _ => Err("Unrecognized enum variant".into()),
        }
    }
}