teacherlib/enums/
comment_type.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 CommentType {
    Positive,
    Negative,
    Informational,
    Suggestion,
    Question,
    Other,

}

#[cfg(feature = "diesel")]
impl ToSql<Varchar, Pg> for CommentType {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            CommentType::Positive => out.write_all(b"Positive")?,
            CommentType::Negative => out.write_all(b"Negative")?,
            CommentType::Informational => out.write_all(b"Informational")?,
            CommentType::Suggestion => out.write_all(b"Suggestion")?,
            CommentType::Question => out.write_all(b"Question")?,
            CommentType::Other => out.write_all(b"Other")?,
        }
        Ok(IsNull::No)
    }
}

#[cfg(feature = "diesel")]
impl FromSql<Varchar, Pg> for CommentType {
    fn from_sql(bytes: Option<&<Pg as Backend>::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"Positive" => Ok(CommentType::Positive),
            b"Negative" => Ok(CommentType::Negative),
            b"Informational" => Ok(CommentType::Informational),
            b"Suggestion" => Ok(CommentType::Suggestion),
            b"Question" => Ok(CommentType::Question),
            b"Other" => Ok(CommentType::Other),
            _ => Err("Unrecognized enum variant".into()),
        }
    }
}