programlib/enums/
student_type.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 StudentType {
    GeneralStudents,
    StudentsWithDisabilities,
    GeneralPublic,
    Teachers,
    Parents,
    Special,
    Other
}

#[cfg(feature = "diesel")]
impl ToSql<Varchar, Pg> for StudentType {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            StudentType::GeneralStudents => out.write_all(b"GeneralStudents")?,
            StudentType::StudentsWithDisabilities => out.write_all(b"StudentsWithDisabilities")?,
            StudentType::GeneralPublic => out.write_all(b"GeneralPublic")?,
            StudentType::Teachers => out.write_all(b"Teachers")?,
            StudentType::Parents => out.write_all(b"Parents")?,
            StudentType::Special => out.write_all(b"Special")?,
            StudentType::Other => out.write_all(b"Other")?,
        }
        Ok(IsNull::No)
    }
}

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

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