Module diesel::helper_types [−] [src]

Provide helper types for concisely writing the return type of functions. As with iterators, it is unfortunately difficult to return a partially constructed query without exposing the exact implementation of the function. Without higher kinded types, these various DSLs can't be combined into a single trait for boxing purposes.

All types here are in the form <FirstType as DslName<OtherTypes>>::Output. So the return type of users.filter(first_name.eq("John")).order(last_name.asc()).limit(10) would be Limit<Order<FindBy<users, first_name, &str>, Asc<last_name>>>

Type Definitions

And	The return type of `lhs.and(rhs)`
AsExpr	The type of `Item` when converted to an expression with the same type as `TargetExpr`
AsExprOf	The type of `Item` when converted to an expression of `Type`
Between	The return type of `lhs.between(lower, upper)`
Distinct	Represents the return type of `.distinct()`
DistinctOn	Represents the return type of `.distinct_on(expr)`
Eq	The return type of `lhs.eq(rhs)`
EqAny	The return type of `lhs.eq_any(rhs)`
Filter	Represents the return type of `.filter(predicate)`
Find	Represents the return type of `.find(pk)`
FindBy	Represents the return type of `.filter(lhs.eq(rhs))`
ForUpdate	Represents the return type of `.for_update()`
Gt	The return type of `lhs.gt(rhs)`
GtEq	The return type of `lhs.ge(rhs)`
InnerJoin	Represents the return type of `.inner_join(rhs)`
IntoBoxed	Represents the return type of `.into_boxed::<'a, DB>()`
LeftJoin	Represents the return type of `.left_join(rhs)`
Like	The return type of `lhs.like(rhs)`
Limit	Represents the return type of `.limit()`
Lt	The return type of `lhs.lt(rhs)`
LtEq	The return type of `lhs.le(rhs)`
Not	The return type of `not(expr)`
NotBetween	The return type of `lhs.not_between(lower, upper)`
NotEq	The return type of `lhs.ne(rhs)`
NotLike	The return type of `lhs.not_like(rhs)`
Offset	Represents the return type of `.offset()`
Order	Represents the return type of `.order(ordering)`
Select	Represents the return type of `.select(selection)`
SqlTypeOf	The SQL type of an expression
Update	Represents the return type of `update(lhs).set(rhs)`