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use expression::{Expression, NonAggregate};
use query_builder::AsQuery;
use query_source::filter::FilteredQuerySource;
use query_source::{Table, InnerJoinSource, LeftOuterJoinSource};
use types::Bool;
pub trait FilterDsl<Predicate: Expression<SqlType=Bool> + NonAggregate> {
type Output: AsQuery;
fn filter(self, predicate: Predicate) -> Self::Output;
}
pub trait NotFiltered {
}
impl<T, Predicate> FilterDsl<Predicate> for T where
Predicate: Expression<SqlType=Bool> + NonAggregate,
FilteredQuerySource<T, Predicate>: AsQuery,
T: NotFiltered,
{
type Output = FilteredQuerySource<Self, Predicate>;
fn filter(self, predicate: Predicate) -> Self::Output {
FilteredQuerySource::new(self, predicate)
}
}
impl<T: Table> NotFiltered for T {}
impl<Left, Right> NotFiltered for InnerJoinSource<Left, Right> {}
impl<Left, Right> NotFiltered for LeftOuterJoinSource<Left, Right> {}