elephantry 5.1.1

Object model manager for PostgreSQL
Documentation 
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impl crate::ToSql for chrono::DateTime<chrono::Utc> {
    fn ty(&self) -> crate::pq::Type {
        crate::pq::types::TIMESTAMPTZ
    }

    /*
     * https://github.com/postgres/postgres/blob/REL_12_0/src/backend/utils/adt/timestamp.c#L756
     */
    fn to_text(&self) -> crate::Result<Option<String>> {
        self.format("%F %T%z").to_string().to_text()
    }

    /*
     * https://github.com/postgres/postgres/blob/REL_12_0/src/backend/utils/adt/timestamp.c#L818
     */
    fn to_binary(&self) -> crate::Result<Option<Vec<u8>>> {
        self.naive_utc().to_binary()
    }
}

impl crate::FromSql for chrono::DateTime<chrono::Utc> {
    /*
     * https://github.com/postgres/postgres/blob/REL_12_0/src/backend/utils/adt/timestamp.c#L386
     */
    fn from_text(ty: &crate::pq::Type, raw: Option<&str>) -> crate::Result<Self> {
        let ts = chrono::DateTime::<chrono::offset::FixedOffset>::from_text(ty, raw)?;

        Ok(ts.with_timezone(&chrono::Utc))
    }

    /*
     * https://github.com/postgres/postgres/blob/REL_12_0/src/backend/utils/adt/timestamp.c#L784
     */
    fn from_binary(ty: &crate::pq::Type, raw: Option<&[u8]>) -> crate::Result<Self> {
        let naive = chrono::NaiveDateTime::from_binary(ty, raw)?;
        Ok(chrono::TimeZone::from_utc_datetime(&chrono::Utc, &naive))
    }
}

impl crate::entity::Simple for chrono::DateTime<chrono::Utc> {}

impl crate::ToSql for chrono::DateTime<chrono::offset::FixedOffset> {
    fn ty(&self) -> crate::pq::Type {
        crate::pq::types::TIMESTAMPTZ
    }

    fn to_text(&self) -> crate::Result<Option<String>> {
        self.format("%F %T%z").to_string().to_text()
    }

    fn to_binary(&self) -> crate::Result<Option<Vec<u8>>> {
        self.naive_utc().to_binary()
    }
}

impl crate::FromSql for chrono::DateTime<chrono::offset::FixedOffset> {
    fn from_text(ty: &crate::pq::Type, raw: Option<&str>) -> crate::Result<Self> {
        chrono::DateTime::parse_from_str(crate::from_sql::not_null(raw)?, "%F %T%#z")
            .map_err(|_| Self::error(ty, raw))
    }

    fn from_binary(ty: &crate::pq::Type, raw: Option<&[u8]>) -> crate::Result<Self> {
        let utc = chrono::DateTime::<chrono::Utc>::from_binary(ty, raw)?;
        let offset = chrono::offset::FixedOffset::east_opt(0)
            .ok_or_else(|| crate::Error::Chrono("Invalid offest".to_string()))?;

        Ok(utc.with_timezone(&offset))
    }
}

impl crate::entity::Simple for chrono::DateTime<chrono::offset::FixedOffset> {}

/**
 * Rust type for [timestamptz](https://www.postgresql.org/docs/current/datatype-datetime.html).
 */
pub type TimestampTz = chrono::DateTime<chrono::offset::Local>;

impl crate::ToSql for TimestampTz {
    fn ty(&self) -> crate::pq::Type {
        crate::pq::types::TIMESTAMPTZ
    }

    fn to_text(&self) -> crate::Result<Option<String>> {
        self.format("%F %T").to_string().to_text()
    }

    fn to_binary(&self) -> crate::Result<Option<Vec<u8>>> {
        self.naive_utc().to_binary()
    }
}

impl crate::FromSql for TimestampTz {
    fn from_text(ty: &crate::pq::Type, raw: Option<&str>) -> crate::Result<Self> {
        let utc = chrono::DateTime::<chrono::Utc>::from_text(ty, raw)?;
        Ok(utc.with_timezone(&chrono::offset::Local))
    }

    fn from_binary(ty: &crate::pq::Type, raw: Option<&[u8]>) -> crate::Result<Self> {
        let utc = chrono::DateTime::<chrono::Utc>::from_binary(ty, raw)?;
        Ok(utc.with_timezone(&chrono::offset::Local))
    }
}

impl crate::entity::Simple for TimestampTz {}

#[cfg(test)]
mod test {
    crate::sql_test!(
        timestamptz,
        chrono::DateTime<chrono::Utc>,
        [(
            "'1970-01-01 00:00:00+00'",
            chrono::TimeZone::from_utc_datetime(
                &chrono::Utc,
                &chrono::DateTime::from_timestamp(0, 0)
                    .unwrap()
                    .naive_local(),
            ),
        )]
    );
}