Function diesel::pg::expression::functions::array_ndims

pub fn array_ndims<Arr: ArrayOrNullableArray + SingleValue + MaybeNullableValue<Integer>, arr>(
    arr: arr,
) -> array_ndims<Arr, arr>
where
    arr: AsExpression<Arr>,

Available on crate feature postgres_backend only.

Returns the number of dimensions of the array

Example

 // diesel currently only supports 1D arrays
let dims = diesel::select(array_ndims::<Array<Integer>, _>(vec![1, 2]))
    .get_result::<i32>(connection)?;
assert_eq!(1, dims);

let dims = diesel::select(array_ndims::<Nullable<Array<Integer>>, _>(None::<Vec<i32>>))
    .get_result::<Option<i32>>(connection)?;
assert_eq!(None, dims);