pub trait StaticallySizedRow<ST, DB: Backend>: FromSqlRow<ST, DB> {
    const FIELD_COUNT: usize;
}
Expand description

A marker trait indicating that the corresponding type consumes a static at compile time known number of field

There is normally no need to implement this trait. Diesel provides wild card impls for all types that implement FromSql<ST, DB> or Queryable<ST, DB> where the size of ST is known

Required Associated Constants§

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const FIELD_COUNT: usize

The number of fields that this type will consume.

Implementors§

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impl<T, ST, DB> StaticallySizedRow<ST, DB> for Twhere ST: SqlTypeOrSelectable + TupleSize, T: Queryable<ST, DB>, DB: Backend,

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const FIELD_COUNT: usize = <ST as crate::util::TupleSize>::SIZE