timesheetlib/enums/
entry_status.rs

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use std::fmt;
use std::fmt::Formatter;
use std::str;

use serde::Deserialize;
use serde::Serialize;

#[cfg(feature = "diesel")]
use {
    diesel::{deserialize, not_none, serialize},
    diesel::{AsExpression, FromSqlRow},
    diesel::backend::Backend,
    diesel::deserialize::FromSql,
    diesel::pg::Pg,
    diesel::serialize::{IsNull, Output, ToSql},
    diesel::types::Varchar,
    std::io::Write,
};

#[derive(Debug, PartialEq, Clone, Serialize, Deserialize)]
#[cfg_attr(
feature = "diesel",
derive(AsExpression, FromSqlRow),
sql_type = "Varchar"
)]

pub enum EntryStatus {
    Draft,
    Approved,
    Rejected,
    Submitted,
    Canceled,
    Payed,
    Review,
    Undefined,

}
impl fmt::Display for EntryStatus {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        write!(f, "{:?}", self)
    }
}
impl Default for EntryStatus {
    fn default() -> Self {
        EntryStatus::Undefined
    }
}


#[cfg(feature = "diesel")]
impl ToSql<Varchar, Pg> for EntryStatus {
    fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
        match *self {
            EntryStatus::Draft => out.write_all(b"Draft")?,
            EntryStatus::Approved => out.write_all(b"Approved")?,
            EntryStatus::Rejected => out.write_all(b"Rejected")?,
            EntryStatus::Submitted => out.write_all(b"Submitted")?,
            EntryStatus::Canceled => out.write_all(b"Canceled")?,
            EntryStatus::Payed => out.write_all(b"Payed")?,
            EntryStatus::Review => out.write_all(b"Review")?,
            EntryStatus::Undefined => out.write_all(b"Undefined")?,

        }
        Ok(IsNull::No)
    }
}


#[cfg(feature = "diesel")]
impl FromSql<Varchar, Pg> for EntryStatus {
    fn from_sql(bytes: Option<&<Pg as Backend>::RawValue>) -> deserialize::Result<Self> {
        match not_none!(bytes) {
            b"Draft" => Ok(EntryStatus::Draft),
            b"Approved" => Ok(EntryStatus::Approved),
            b"Rejected" => Ok(EntryStatus::Rejected),
            b"Submitted" => Ok(EntryStatus::Submitted),
            b"Canceled" => Ok(EntryStatus::Canceled),
            b"Payed" => Ok(EntryStatus::Payed),
            b"Review" => Ok(EntryStatus::Review),
            b"Undefined" => Ok(EntryStatus::Undefined),

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