competitionlib/enums/
tournament_system_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::backend::Backend,
    diesel::deserialize::FromSql,
    diesel::pg::Pg,
    diesel::serialize::{IsNull, Output, ToSql},
    diesel::sql_types::VarChar,
    diesel::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 TournamentSystemType {
    ScoreBased,
    DoubleElimination,
    TripleElimination,
    GroupAndElimination,
    League,
    Swiss,
}

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

#[cfg(not(feature = "wasm"))]
impl ToSql<VarChar, Pg> for TournamentSystemType {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            TournamentSystemType::ScoreBased => out.write_all(b"ScoreBased")?,
            TournamentSystemType::DoubleElimination => out.write_all(b"DoubleElimination")?,
            TournamentSystemType::TripleElimination => out.write_all(b"TripleElimination")?,
            TournamentSystemType::GroupAndElimination => out.write_all(b"GroupAndElimination")?,
            TournamentSystemType::League => out.write_all(b"League")?,
            TournamentSystemType::Swiss => out.write_all(b"Swiss")?,
        }
        Ok(IsNull::No)
    }
}

#[cfg(not(feature = "wasm"))]
impl FromSql<VarChar, Pg> for TournamentSystemType {
    fn from_sql(bytes: Option<&<Pg as Backend>::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"ScoreBased" => Ok(TournamentSystemType::ScoreBased),
            b"DoubleElimination" => Ok(TournamentSystemType::DoubleElimination),
            b"TripleElimination" => Ok(TournamentSystemType::TripleElimination),
            b"GroupAndElimination" => Ok(TournamentSystemType::GroupAndElimination),
            b"League" => Ok(TournamentSystemType::League),
            b"Swiss" => Ok(TournamentSystemType::Swiss),
            _ => Err("Unrecognized enum variant".into()),
        }
    }
}