chemlib/enums/
completion_status.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 CompletionStatus {
    Scheduled,
    Started,
    Finished,
    Unsuccessful,
    Successful,
}

#[cfg(feature = "diesel")]
impl ToSql<Varchar, Pg> for CompletionStatus {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            CompletionStatus::Scheduled => out.write_all(b"Scheduled")?,
            CompletionStatus::Started => out.write_all(b"Started")?,
            CompletionStatus::Finished => out.write_all(b"Finished")?,
            CompletionStatus::Unsuccessful => out.write_all(b"Unsuccessful")?,
            CompletionStatus::Successful => out.write_all(b"Successful")?,
        }
        Ok(IsNull::No)
    }
}

#[cfg(feature = "diesel")]
impl FromSql<Varchar, Pg> for CompletionStatus {
    fn from_sql(bytes: Option<&<Pg as Backend>::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"Scheduled" => Ok(CompletionStatus::Scheduled),
            b"Started" => Ok(CompletionStatus::Started),
            b"Finished" => Ok(CompletionStatus::Finished),
            b"Unsuccessful" => Ok(CompletionStatus::Unsuccessful),
            b"Successful" => Ok(CompletionStatus::Successful),
            _ => Err("Unrecognized enum variant".into()),
        }
    }
}