hrlib/enums/
academic_degree.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 AcademicDegree {
    IncompleteHigher,
    Bachelor,
    CertifiedSpecialist,
    Master,
    PhD,
}

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

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