assignmentlib/enums/
attempt_status.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 AttemptStatus {
    Incomplete,
    Complete,
    Checked,
    Finished,
}

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

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