Enum ParentRef 

pub enum ParentRef {
    Root,
    Index(RecordId),
}

Reference to a parent record.

This enum provides a type-safe way to represent parent references, distinguishing between root records (no parent) and records with a valid parent reference.

Variants

Root

This record is a root (no parent).

Index(RecordId)

This record has a parent at the given index.

Implementations

impl ParentRef

pub fn from_owner_index(index: i32) -> Self

Create a ParentRef from an owner index value.

Negative values or values that would be invalid indexes are treated as Root.

pub fn to_owner_index(self) -> i32

Convert to an owner index value.

Root returns -1, otherwise returns the index.

pub fn is_root(self) -> bool

Check if this is a root reference.

pub fn id(self) -> Option<RecordId>

Get the parent RecordId, if any.

Trait Implementations

impl Clone for ParentRef

fn clone(&self) -> ParentRef

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ParentRef

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ParentRef

fn default() -> ParentRef

Returns the “default value” for a type.

impl From<Option<RecordId>> for ParentRef

fn from(id: Option<RecordId>) -> Self

Converts to this type from the input type.

impl From<i32> for ParentRef

fn from(index: i32) -> Self

Converts to this type from the input type.

impl Hash for ParentRef

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ParentRef

fn eq(&self, other: &ParentRef) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ParentRef

impl Eq for ParentRef

impl StructuralPartialEq for ParentRef