chemlib/enums/
agregate_state.rs

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use serde::Deserialize;
use serde::Serialize;
use std::io::Write;
use strum_macros::{Display, 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, Display, EnumString)]
#[cfg_attr(feature = "diesel", derive(AsExpression, FromSqlRow))]
#[cfg_attr(feature = "diesel", sql_type = "Varchar")]
pub enum AggregateState {
    Solid,
    CrystalSmall,
    CrystalBig,
    Amorphous,
    Liquid,
    Gas,
    Plasma
}

#[cfg(feature = "diesel")]
impl ToSql<Varchar, Pg> for AggregateState {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            AggregateState::Solid => out.write_all(b"Solid")?,
            AggregateState::CrystalSmall => out.write_all(b"CrystalSmall")?,
            AggregateState::CrystalBig => out.write_all(b"CrystalBig")?,
            AggregateState::Amorphous => out.write_all(b"Amorphous")?,
            AggregateState::Liquid => out.write_all(b"Liquid")?,
            AggregateState::Gas => out.write_all(b"Gas")?,
            AggregateState::Plasma => out.write_all(b"Plasma")?,
        }
        Ok(IsNull::No)
    }
}

#[cfg(feature = "diesel")]
impl FromSql<Varchar, Pg> for AggregateState {
    fn from_sql(bytes: Option<&<Pg as Backend>::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"Solid" => Ok( AggregateState::Solid),
            b"CrystalSmall" => Ok(AggregateState::CrystalSmall),
            b"CrystalBig" => Ok(AggregateState::CrystalBig),
            b"Amorphous" => Ok(AggregateState::Amorphous),
            b"Liquid" => Ok(AggregateState::Liquid),
            b"Gas" => Ok(AggregateState::Gas),
            b"Plasma" => Ok(AggregateState::Plasma),
            _ => Err("Unrecognized enum variant".into()),
        }
    }
}