teacherlib/enums/
lesson_feedback_status.rs

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use std::fmt;
use std::fmt::Formatter;
use std::str;

use serde::Deserialize;
use serde::Serialize;

#[cfg(feature = "diesel")]
use {
    diesel::{deserialize, not_none, serialize},
    diesel::{AsExpression, FromSqlRow},
    diesel::backend::Backend,
    diesel::deserialize::FromSql,
    diesel::pg::Pg,
    diesel::serialize::{IsNull, Output, ToSql},
    diesel::types::Varchar,
    std::io::Write,
};

#[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
#[cfg_attr(
feature = "diesel",
derive(AsExpression, FromSqlRow),
sql_type = "Varchar"
)]
pub enum LessonFeedbackStatus {
    New,
    Submitted,
    Responded,
    Complete,
    Withdrawn,
    Blocked,
    Hidden,
}
impl fmt::Display for LessonFeedbackStatus {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        write!(f, "{:?}", self)
    }
}
#[cfg(feature = "diesel")]
impl ToSql<Varchar, Pg> for LessonFeedbackStatus {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            LessonFeedbackStatus::New => out.write_all(b"New")?,
            LessonFeedbackStatus::Submitted => out.write_all(b"Submitted")?,
            LessonFeedbackStatus::Responded => out.write_all(b"Responded")?,
            LessonFeedbackStatus::Complete => out.write_all(b"Complete")?,
            LessonFeedbackStatus::Withdrawn => out.write_all(b"Withdrawn")?,
            LessonFeedbackStatus::Blocked => out.write_all(b"Blocked")?,
            LessonFeedbackStatus::Hidden => out.write_all(b"Hidden")?,
        }
        Ok(IsNull::No)
    }
}

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            b"Withdrawn" =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 Ok(LessonFeedbackStatus::Withdrawn),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