Trait diesel::expression::BoxableExpression [−] [src]

pub trait BoxableExpression<QS, ST: NativeSqlType>: Expression + SelectableExpression<QS, ST> + NonAggregate { }

Helper trait used when boxing expressions. This exists to work around the fact that Rust will not let us use non-core types as bounds on a trait object (you could not return Box<Expression+NonAggregate>)

Implementors