teacherlib/enums/
like_action.rs

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use serde::Deserialize;
use serde::Serialize;
use std::str;
#[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)]
#[cfg_attr(feature = "diesel", derive(AsExpression, FromSqlRow))]
#[cfg_attr(feature = "diesel", sql_type = "Varchar")]
pub enum LikeAction {
    Like,
    Dislike,
    LikeAndRemoveDislike,
    DislikeAndRemoveLike,
    RemoveLike,
    RemoveDislike,

}

#[cfg(feature = "diesel")]
impl ToSql<Varchar, Pg> for LikeAction {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            LikeAction::Like => out.write_all(b"Like")?,
            LikeAction::Dislike => out.write_all(b"Dislike")?,
            LikeAction::LikeAndRemoveDislike => out.write_all(b"LikeAndRemoveDislike")?,
            LikeAction::DislikeAndRemoveLike => out.write_all(b"DislikeAndRemoveLike")?,
            LikeAction::RemoveLike => out.write_all(b"RemoveLike")?,
            LikeAction::RemoveDislike => out.write_all(b"RemoveDislike")?,
        }
        Ok(IsNull::No)
    }
}

#[cfg(feature = "diesel")]
impl FromSql<Varchar, Pg> for LikeAction {
    fn from_sql(bytes: Option<&<Pg as Backend>::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"Like" => Ok(LikeAction::Like),
            b"Dislike" => Ok(LikeAction::Dislike),
            b"LikeAndRemoveDislike" => Ok(LikeAction::LikeAndRemoveDislike),
            b"DislikeAndRemoveLike" => Ok(LikeAction::DislikeAndRemoveLike),
            b"RemoveLike" => Ok(LikeAction::RemoveLike),
            b"RemoveDislike" => Ok(LikeAction::RemoveDislike),
            _ => Err("Unrecognized enum variant".into()),
        }
    }
}