journallib/enums/
absent_reason.rs

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use serde::Deserialize;
use serde::Serialize;
use {
    diesel::backend::Backend,
    diesel::deserialize::FromSql,
    diesel::pg::Pg,
    diesel::serialize::{IsNull, Output, ToSql},
    diesel::sql_types::Varchar,
    diesel::{deserialize, not_none, serialize},
    std::io::Write,
    diesel::{AsExpression, FromSqlRow},
};

#[derive(Debug, PartialEq, Clone, Serialize, Deserialize, AsExpression, FromSqlRow)]
#[sql_type = "Varchar"]
pub enum AbsentReason {
    StudentServicePrograms,
    ReferralsToWellbeing,
    HomeSchoolLiaisonOfficers,
    ReportingOfKLAAttendance,
    Event,
    Family,
    Religious,
    Travel,
    Suspension,
    Medical,
    Other,
}

impl ToSql<Varchar, Pg> for AbsentReason {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            AbsentReason::StudentServicePrograms => out.write_all(b"StudentServicePrograms")?,
            AbsentReason::ReferralsToWellbeing => out.write_all(b"ReferralsToWellbeing")?,
            AbsentReason::HomeSchoolLiaisonOfficers => out.write_all(b"HomeSchoolLiaisonOfficers")?,
            AbsentReason::ReportingOfKLAAttendance => out.write_all(b"ReportingOfKLAAttendance")?,
            AbsentReason::Event => out.write_all(b"Event")?,
            AbsentReason::Family => out.write_all(b"Family")?,
            AbsentReason::Religious => out.write_all(b"Religious")?,
            AbsentReason::Travel => out.write_all(b"Travel")?,
            AbsentReason::Suspension => out.write_all(b"Suspension")?,
            AbsentReason::Medical => out.write_all(b"Medical")?,
            AbsentReason::Other => out.write_all(b"Other")?,
        }
        Ok(IsNull::No)
    }
}

impl FromSql<Varchar, Pg> for AbsentReason {
    fn from_sql(bytes: Option<&<Pg as Backend>::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"StudentServicePrograms" => Ok(AbsentReason::StudentServicePrograms),
            b"ReferralsToWellbeing" => Ok(AbsentReason::ReferralsToWellbeing),
            b"HomeSchoolLiaisonOfficers" => Ok(AbsentReason::HomeSchoolLiaisonOfficers),
            b"ReportingOfKLAAttendance" => Ok(AbsentReason::ReportingOfKLAAttendance),
            b"Event" => Ok(AbsentReason::Event),
            b"Family" => Ok(AbsentReason::Family),
            b"Religious" => Ok(AbsentReason::Religious),
            b"Travel" => Ok(AbsentReason::Travel),
            b"Suspension" => Ok(AbsentReason::Suspension),
            b"Medical" => Ok(AbsentReason::Medical),
            b"Other" => Ok(AbsentReason::Other),

            _ => Err("Unrecognized enum variant".into()),
        }
    }
}