siteslib/enums/
article_type.rs

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

#[derive(Debug, Display, PartialEq, FromSqlRow, AsExpression, Clone, Serialize, Deserialize)]
#[sql_type = "Varchar"]
pub enum ArticleType {
    Article,
    News,
    MarketPolicy,
}

impl ToSql<Varchar, Pg> for ArticleType {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            ArticleType::Article => out.write_all(b"Article")?,
            ArticleType::News => out.write_all(b"News")?,
            ArticleType::MarketPolicy => out.write_all(b"MarketPolicy")?,
        }
        Ok(IsNull::No)
    }
}

impl FromSql<Varchar, Pg> for ArticleType {
    fn from_sql(bytes: Option<&<Pg as Backend>::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"Article" => Ok(ArticleType::Article),
            b"News" => Ok(ArticleType::News),
            b"MarketPolicy" => Ok(ArticleType::MarketPolicy),

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