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#[cfg(feature = "postgres")]
use expression::SelectableExpression;
use query_source::Table;
pub trait DistinctDsl {
type Output;
fn distinct(self) -> Self::Output;
}
impl<T> DistinctDsl for T
where
T: Table,
T::Query: DistinctDsl,
{
type Output = <T::Query as DistinctDsl>::Output;
fn distinct(self) -> Self::Output {
self.as_query().distinct()
}
}
#[cfg(feature = "postgres")]
pub trait DistinctOnDsl<Selection> {
type Output;
fn distinct_on(self, selection: Selection) -> Self::Output;
}
#[cfg(feature = "postgres")]
impl<T, Selection> DistinctOnDsl<Selection> for T
where
Selection: SelectableExpression<T>,
T: Table,
T::Query: DistinctOnDsl<Selection>,
{
type Output = <T::Query as DistinctOnDsl<Selection>>::Output;
fn distinct_on(self, selection: Selection) -> Self::Output {
self.as_query().distinct_on(selection)
}
}