Struct RelDef 

pub struct RelDef {
    pub name: Box<str>,
    pub child: Option<Box<Schema>>,
    pub project: Option<ScalarProjection>,
}

A declared outgoing relationship on a table Schema (slot = index in Schema::relationships). Carries the public name the View surfaces (09) and, when known, the target Schema the relationship points at — the hierarchical SourceSchema the production ArrayView (09) navigates to sort child entries. child is None for a join-only RelDef (name resolution alone — the join already holds the child schema separately); the View requires Some.

Fields

name: Box<str>

Relationship name. Owned (Box<str>) so a runtime-supplied schema (the JS wasm boundary, WS01.3) can construct it — column/relationship names are not 'static when they arrive from JavaScript. The constructors still accept &str, so &'static str literals at the existing call sites coerce in.

child: Option<Box<Schema>>

The relationship’s target schema (the child level). None for join-only uses that need name→slot resolution but never feed a View.

project: Option<ScalarProjection>

When Some, this is a scalar-projected relationship aggregate (REDUCE-DESIGN.md §9): the presentation boundary unwraps the one-row child into a scalar field (see ScalarProjection). None for an ordinary (plural or .one() object) relationship.

Implementations

impl RelDef

pub fn new(name: &str) -> RelDef

A join-only relationship: just a name (no child schema). Used wherever a parent schema declares a relationship purely so a join can resolve its rel_name to a RelId slot (Schema::rel_slot).

pub fn related(name: &str, child: Schema) -> RelDef

A View-facing relationship carrying its target (child) schema.

pub fn project_scalar(self, col: usize, identity: OwnedValue) -> RelDef

Mark this relationship as a scalar-projected aggregate (REDUCE-DESIGN.md §9): the presentation boundary unwraps the one-row child, surfacing child column col as a scalar field (with identity substituted when the relationship is empty). Builder over RelDef::related — the child schema (the synthetic aggregate row) must already be attached.

Trait Implementations

impl Clone for RelDef

fn clone(&self) -> RelDef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RelDef

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

Formats the value using the given formatter.