assignmentlib/enums/
transition_condition_type.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 TransitionConditionType {
    Correct,
    Incorrect,
    SelectedOption,
    MinValue,
    MaxValue,
}

#[cfg(feature = "diesel")]
impl ToSql<Varchar, Pg> for TransitionConditionType {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            TransitionConditionType::Correct => out.write_all(b"Correct")?,
            TransitionConditionType::Incorrect => out.write_all(b"Incorrect")?,
            TransitionConditionType::SelectedOption => out.write_all(b"SelectedOption")?,
            TransitionConditionType::MinValue => out.write_all(b"MinValue")?,
            TransitionConditionType::MaxValue => out.write_all(b"MaxValue")?,
        }
        Ok(IsNull::No)
    }
}

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