librarylib/enums/
request_status.rs

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use serde::Deserialize;
use serde::Serialize;
use std::fmt;
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 RequestStatus {
    OnHand, // todo more variants
    ReadyToReceive,
    Returned,
    Request,
}

impl fmt::Display for RequestStatus {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "{:?}", self)
    }
}

#[cfg(feature = "diesel")]
impl ToSql<Varchar, Pg> for RequestStatus {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            RequestStatus::OnHand => out.write_all(b"OnHand")?,
            RequestStatus::ReadyToReceive => out.write_all(b"ReadyToReceive")?,
            RequestStatus::Returned => out.write_all(b"Returned")?,
            RequestStatus::Request => out.write_all(b"Request")?,
        }
        Ok(IsNull::No)
    }
}
#[cfg(feature = "diesel")]
impl FromSql<Varchar, Pg> for RequestStatus {
    fn from_sql(bytes: Option<&<Pg as Backend>::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"OnHand" => Ok(RequestStatus::OnHand),
            b"ReadyToReceive" => Ok(RequestStatus::ReadyToReceive),
            b"Returned" => Ok(RequestStatus::Returned),
            b"Request" => Ok(RequestStatus::Request),
            _ => Err("Unrecognized enum variant".into()),
        }
    }
}