diesel/query_dsl/
order_dsl.rs

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1use crate::expression::Expression;
2use crate::query_source::Table;
3
4/// The `order` method
5///
6/// This trait should not be relied on directly by most apps. Its behavior is
7/// provided by [`QueryDsl`]. However, you may need a where clause on this trait
8/// to call `order` from generic code.
9///
10/// [`QueryDsl`]: crate::QueryDsl
11pub trait OrderDsl<Expr: Expression> {
12    /// The type returned by `.order`.
13    type Output;
14
15    /// See the trait documentation.
16    fn order(self, expr: Expr) -> Self::Output;
17}
18
19impl<T, Expr> OrderDsl<Expr> for T
20where
21    Expr: Expression,
22    T: Table,
23    T::Query: OrderDsl<Expr>,
24{
25    type Output = <T::Query as OrderDsl<Expr>>::Output;
26
27    fn order(self, expr: Expr) -> Self::Output {
28        self.as_query().order(expr)
29    }
30}
31
32/// The `then_order_by` method
33///
34/// This trait should not be relied on directly by most apps. Its behavior is
35/// provided by [`QueryDsl`]. However, you may need a where clause on this trait
36/// to call `then_order_by` from generic code.
37///
38/// [`QueryDsl`]: crate::QueryDsl
39pub trait ThenOrderDsl<Expr> {
40    /// The type returned by `.then_order_by`.
41    type Output;
42
43    /// See the trait documentation.
44    fn then_order_by(self, expr: Expr) -> Self::Output;
45}
46
47impl<T, Expr> ThenOrderDsl<Expr> for T
48where
49    Expr: Expression,
50    T: Table,
51    T::Query: ThenOrderDsl<Expr>,
52{
53    type Output = <T::Query as ThenOrderDsl<Expr>>::Output;
54
55    fn then_order_by(self, expr: Expr) -> Self::Output {
56        self.as_query().then_order_by(expr)
57    }
58}
59
60pub trait ValidOrderingForDistinct<D> {}
diesel/query_dsl/order_dsl.rs

diesel/query_dsl/
order_dsl.rs
