Method join

src/query/helper.rs:391–394

Join via [`RelationDef`].

(mut self, join: JoinType, rel: RelationDef)

    /// Join via [`RelationDef`].
    fn join(mut self, join: JoinType, rel: RelationDef) -> Self {
        self.query().join(join, rel.to_tbl.clone(), rel);
        self
    }

    /// Join via [`RelationDef`] but in reverse direction.
    /// Assume when there exist a relation A to B.