competitionlib/enums/
participant_type.rs

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use serde::Deserialize;
use serde::Serialize;
use std::fmt;
use std::fmt::Formatter;
use std::str;
#[cfg(not(feature = "wasm"))]
use {
    diesel::types::Varchar,
    diesel::backend::Backend,
    diesel::deserialize::FromSql,
    diesel::pg::Pg,
    diesel::serialize::{IsNull, Output, ToSql},
    diesel::sql_types::VarChar,
    diesel::{deserialize, not_none, serialize},
    diesel::{AsExpression, FromSqlRow},
    std::io::Write,
};


#[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
#[cfg_attr(
not(feature = "wasm"),
derive(AsExpression, FromSqlRow),
sql_type = "Varchar")]

pub enum ParticipantType {
    Student,
    Teacher,
    Principal,
    Parent
}


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


#[cfg(not(feature = "wasm"))]
impl ToSql<VarChar, Pg> for ParticipantType {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            ParticipantType::Student => out.write_all(b"Student")?,
            ParticipantType::Teacher => out.write_all(b"Teacher")?,
            ParticipantType::Principal => out.write_all(b"Principal")?,
            ParticipantType::Parent => out.write_all(b"Parent")?,
        }
        Ok(IsNull::No)
    }
}

#[cfg(not(feature = "wasm"))]
impl FromSql<VarChar, Pg> for ParticipantType {
    fn from_sql (bytes: Option<&<Pg as Backend> ::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"Student" => Ok(ParticipantType::Student),
            b"Teacher" => Ok(ParticipantType::Teacher),
            b"Principal" => Ok(ParticipantType::Principal),
            b"Parent" => Ok(ParticipantType::Parent),
            _ => Err("Unrecognized enum variant".into())
        }
    }

}