Enum HasKind 

pub enum HasKind {
    Direct(FieldId),
    Via(Via),
}

How a HasMany or HasOne relation reaches its target.

Both relation kinds share this: the question — “is the target reached through a paired BelongsTo, or by following a path?” — is the same for has-many and has-one.

Variants

Direct(FieldId)

The target is reached through a BelongsTo field on the target model. Carries that paired BelongsTo field’s id.

If a #[has_many(pair = <field>)] / #[has_one(pair = <field>)] was supplied, the macro resolves the id at schema-construction time. Otherwise the linker fills it in by searching the target model for a unique BelongsTo back to the source.

Via(Via)

The target is reached by following a Via path of existing relations rather than pairing with a single BelongsTo.

Implementations

impl HasKind

pub fn pair_id(&self) -> Option<FieldId>

The paired BelongsTo field id, or None for a via relation.

pub fn via(&self) -> Option<&Via>

The Via path, or None for a direct relation.

Trait Implementations

impl Clone for HasKind

fn clone(&self) -> HasKind

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for HasKind

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

Formats the value using the given formatter.