programlib/enums/
delivery_mode.rs

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use serde::Deserialize;
use serde::Serialize;
use std::str;
use strum_macros::EnumString;
#[cfg(feature = "diesel")]
use {
    diesel::backend::Backend,
    diesel::deserialize::FromSql,
    diesel::pg::Pg,
    diesel::serialize::{IsNull, Output, ToSql},
    diesel::types::Varchar,
    diesel::{deserialize, not_none, serialize},
    diesel::{AsExpression, FromSqlRow},
    std::io::Write,
};

#[derive(Debug, PartialEq, Clone, Serialize, Deserialize, EnumString)]
#[cfg_attr(feature = "diesel", derive(AsExpression, FromSqlRow))]
#[cfg_attr(feature = "diesel", sql_type = "Varchar")]
pub enum DeliveryMode {
    Personal,
    Remote,
    Mixed,
    Other
}

#[cfg(feature = "diesel")]
impl ToSql<Varchar, Pg> for DeliveryMode {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            DeliveryMode::Personal => out.write_all(b"Personal")?,
            DeliveryMode::Remote => out.write_all(b"Remote")?,
            DeliveryMode::Mixed => out.write_all(b"Mixed")?,
            DeliveryMode::Other => out.write_all(b"Other")?,
        }
        Ok(IsNull::No)
    }
}

impl Default for DeliveryMode {
    fn default() -> Self {
        DeliveryMode::Other
    }
}

#[cfg(feature = "diesel")]
impl FromSql<Varchar, Pg> for DeliveryMode {
    fn from_sql(bytes: Option<&<Pg as Backend>::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"Personal" => Ok(DeliveryMode::Personal),
            b"Remote" => Ok(DeliveryMode::Remote),
            b"Mixed" => Ok(DeliveryMode::Mixed),
            b"Other" => Ok(DeliveryMode::Other),
            _ => Err("Unrecognized enum variant".into()),
        }
    }
}