journallib/enums/
home_work_type.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 HomeWorkType {
    Form,
    Test,
    Files,
    Text,
    Custom,
    #[allow(non_camel_case_types)]
    undefined,
}

impl ToSql<Varchar, Pg> for HomeWorkType {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            HomeWorkType::Form => out.write_all(b"Form")?,
            HomeWorkType::Test => out.write_all(b"Test")?,
            HomeWorkType::Files => out.write_all(b"Files")?,
            HomeWorkType::Text => out.write_all(b"Text")?,
            HomeWorkType::Custom => out.write_all(b"Custom")?,
            HomeWorkType::undefined => out.write_all(b"undefined")?,
        }
        Ok(IsNull::No)
    }
}

impl FromSql<Varchar, Pg> for HomeWorkType {
    fn from_sql(bytes: Option<&<Pg as Backend>::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"Form" => Ok(HomeWorkType::Form),
            b"Test" => Ok(HomeWorkType::Test),
            b"Files" => Ok(HomeWorkType::Files),
            b"Text" => Ok(HomeWorkType::Text),
            b"Custom" => Ok(HomeWorkType::Custom),
            b"undefined" => Ok(HomeWorkType::undefined),

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