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use crate::expression::Expression;
use crate::query_source::Table;
/// The `order` method
///
/// This trait should not be relied on directly by most apps. Its behavior is
/// provided by [`QueryDsl`]. However, you may need a where clause on this trait
/// to call `order` from generic code.
///
/// [`QueryDsl`]: crate::QueryDsl
pub trait OrderDsl<Expr: Expression> {
/// The type returned by `.order`.
type Output;
/// See the trait documentation.
fn order(self, expr: Expr) -> Self::Output;
}
impl<T, Expr> OrderDsl<Expr> for T
where
Expr: Expression,
T: Table,
T::Query: OrderDsl<Expr>,
{
type Output = <T::Query as OrderDsl<Expr>>::Output;
fn order(self, expr: Expr) -> Self::Output {
self.as_query().order(expr)
}
}
/// The `then_order_by` method
///
/// This trait should not be relied on directly by most apps. Its behavior is
/// provided by [`QueryDsl`]. However, you may need a where clause on this trait
/// to call `then_order_by` from generic code.
///
/// [`QueryDsl`]: crate::QueryDsl
pub trait ThenOrderDsl<Expr> {
/// The type returned by `.then_order_by`.
type Output;
/// See the trait documentation.
fn then_order_by(self, expr: Expr) -> Self::Output;
}
impl<T, Expr> ThenOrderDsl<Expr> for T
where
Expr: Expression,
T: Table,
T::Query: ThenOrderDsl<Expr>,
{
type Output = <T::Query as ThenOrderDsl<Expr>>::Output;
fn then_order_by(self, expr: Expr) -> Self::Output {
self.as_query().then_order_by(expr)
}
}
pub trait ValidOrderingForDistinct<D> {}