Trait diesel::sql_types::MaybeNullableType

pub trait MaybeNullableType<O> {
    type Out: SqlType + TypedExpressionType;
}

A type level constructor for maybe nullable types

Constructs either Nullable<O> (for Self == is_nullable::IsNullable) or O (for Self == is_nullable::NotNull)

Required Associated Types

type Out: SqlType + TypedExpressionType

See the trait documentation

Implementors

impl<O> MaybeNullableType<O> for IsNullable

where O: SqlType, Nullable<O>: TypedExpressionType,

type Out = Nullable<O>

impl<O> MaybeNullableType<O> for NotNull

where O: SqlType + TypedExpressionType,

type Out = O