projectlib/enums/
registration_status.rs

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use serde::Deserialize;
use serde::Serialize;
use std::fmt;
use std::io::Write;
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::sql_types::Varchar,
    diesel::{deserialize, not_none, serialize},
};

#[derive(Debug, PartialEq, Clone, Serialize, Deserialize, EnumString)]
#[cfg_attr(feature = "diesel", derive(AsExpression, FromSqlRow))]
#[cfg_attr(feature = "diesel", sql_type = "Varchar")]
pub enum RegistrationStatus {
    Open,
    Closed,
    Expected,
}

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

#[cfg(feature = "diesel")]
impl FromSql<Varchar, Pg> for RegistrationStatus {
    fn from_sql(bytes: Option<&<Pg as Backend>::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"Open" => Ok(RegistrationStatus::Open),
            b"Closed" => Ok(RegistrationStatus::Closed),
            b"Expected" => Ok(RegistrationStatus::Expected),

            _ => Err(format!(
                "Unrecognized enum variant \"{}\"",
                str::from_utf8(bytes.unwrap()).unwrap()
            )
            .into()),
        }
    }
}

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