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

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))`
Limit	Represents the return type of `.limit()`
Offset	Represents the return type of `.offset()`
Order	Represents the return type of `.order(ordering)`
Select	Represents the return type of `.select(selection)`
Update	Represents the return type of `update(lhs).set(rhs)`
With	Represents the return type of `.with(aliased_expr)`