use crate::prelude::*;
use std::ops::Not;
#[derive(Clone, Debug, Serialize)]
pub struct Item {
target: ItemTarget,
#[serde(skip_serializing_if = "Option::is_none")]
relation: Option<&'static str>,
#[serde(skip_serializing_if = "Option::is_none")]
scale: Option<u32>,
#[serde(skip_serializing_if = "Option::is_none")]
max_len: Option<u32>,
#[serde(skip_serializing_if = "Option::is_none")]
max_bytes: Option<u32>,
#[serde(skip_serializing_if = "<[_]>::is_empty")]
validators: &'static [TypeValidator],
#[serde(skip_serializing_if = "<[_]>::is_empty")]
sanitizers: &'static [TypeSanitizer],
#[serde(skip_serializing_if = "Not::not")]
indirect: bool,
}
impl Item {
#[must_use]
#[expect(
clippy::too_many_arguments,
reason = "schema item construction keeps generated scalar, relation, and validation metadata explicit"
)]
pub const fn new(
target: ItemTarget,
relation: Option<&'static str>,
scale: Option<u32>,
max_len: Option<u32>,
max_bytes: Option<u32>,
validators: &'static [TypeValidator],
sanitizers: &'static [TypeSanitizer],
indirect: bool,
) -> Self {
Self {
target,
relation,
scale,
max_len,
max_bytes,
validators,
sanitizers,
indirect,
}
}
#[must_use]
pub const fn target(&self) -> &ItemTarget {
&self.target
}
#[must_use]
pub const fn relation(&self) -> Option<&'static str> {
self.relation
}
#[must_use]
pub const fn scale(&self) -> Option<u32> {
self.scale
}
#[must_use]
pub const fn max_len(&self) -> Option<u32> {
self.max_len
}
#[must_use]
pub const fn max_bytes(&self) -> Option<u32> {
self.max_bytes
}
#[must_use]
pub const fn validators(&self) -> &'static [TypeValidator] {
self.validators
}
#[must_use]
pub const fn sanitizers(&self) -> &'static [TypeSanitizer] {
self.sanitizers
}
#[must_use]
pub const fn indirect(&self) -> bool {
self.indirect
}
#[must_use]
pub const fn is_relation(&self) -> bool {
self.relation().is_some()
}
}
impl ValidateNode for Item {
fn validate(&self) -> Result<(), ErrorTree> {
let mut errs = ErrorTree::new();
let schema = schema_read();
match self.target() {
ItemTarget::Is(path) => {
if schema.check_node_as::<Entity>(path).is_ok() {
err!(errs, "a non-relation Item cannot reference an Entity");
}
}
ItemTarget::Primitive(_) => {}
}
if let Some(relation) = self.relation() {
match schema.cast_node::<Entity>(relation) {
Ok(entity) => {
if entity.primary_key().fields().len() != 1 {
err!(
errs,
"relation entity '{relation}' uses composite primary key fields {:?}; single-field relation targets require a scalar primary key; use ordered relation tuple metadata for composite targets",
entity.primary_key().fields()
);
} else if let Some(primary_field) = entity.scalar_primary_key_field() {
let relation_target = primary_field.value().item().target();
let relation_scale = primary_field.value().item().scale();
let relation_max_len = primary_field.value().item().max_len();
let relation_max_bytes = primary_field.value().item().max_bytes();
if self.target() != relation_target
|| self.scale() != relation_scale
|| self.max_len() != relation_max_len
|| self.max_bytes() != relation_max_bytes
{
err!(
errs,
"relation target type mismatch: expected ({:?}, scale={:?}, max_len={:?}, max_bytes={:?}), found ({:?}, scale={:?}, max_len={:?}, max_bytes={:?})",
relation_target,
relation_scale,
relation_max_len,
relation_max_bytes,
self.target(),
self.scale(),
self.max_len(),
self.max_bytes()
);
}
} else {
let primary_key_field =
entity.primary_key().scalar_field().unwrap_or("<composite>");
err!(
errs,
"relation entity '{relation}' missing primary key field '{0}'",
primary_key_field
);
}
}
Err(_) => {
err!(errs, "relation entity '{relation}' not found");
}
}
}
errs.result()
}
}
impl VisitableNode for Item {
fn drive<V: Visitor>(&self, v: &mut V) {
for node in self.validators() {
node.accept(v);
}
}
}
#[derive(Clone, Debug, Eq, PartialEq, Serialize)]
pub enum ItemTarget {
Is(&'static str),
Primitive(Primitive),
}
#[cfg(test)]
mod tests {
use super::*;
use crate::build::schema_write;
fn primitive_item(primitive: Primitive) -> Item {
Item::new(
ItemTarget::Primitive(primitive),
None,
None,
None,
None,
&[],
&[],
false,
)
}
fn relation_item(target_path: &'static str, primitive: Primitive) -> Item {
Item::new(
ItemTarget::Primitive(primitive),
Some(target_path),
None,
None,
None,
&[],
&[],
false,
)
}
fn field(ident: &'static str, primitive: Primitive) -> Field {
Field::new(
ident,
Value::new(Cardinality::One, primitive_item(primitive)),
None,
None,
None,
)
}
fn insert_entity(
module: &'static str,
ident: &'static str,
pk_fields: &'static [&'static str],
fields: &'static [Field],
) -> &'static str {
let path = Box::leak(format!("{module}::{ident}").into_boxed_str());
schema_write().insert_node(SchemaNode::Entity(Entity::new(
Def::new(module, ident),
"SchemaItemRelationStore",
PrimaryKey::new(pk_fields, PrimaryKeySource::External),
None,
&[],
FieldList::new(fields),
Type::new(&[], &[]),
)));
path
}
#[test]
fn relation_to_composite_target_rejects_even_when_first_component_matches() {
let fields = Box::leak(
vec![
field("tenant_id", Primitive::Nat64),
field("local_id", Primitive::Nat64),
]
.into_boxed_slice(),
);
let target_path = insert_entity(
"schema_item_relation_composite_target",
"CompositeTarget",
&["tenant_id", "local_id"],
fields,
);
let err = relation_item(target_path, Primitive::Nat64)
.validate()
.expect_err("relation to composite target must fail before first-field matching");
assert!(
err.messages().iter().any(|message| {
message.contains("uses composite primary key fields")
&& message
.contains("single-field relation targets require a scalar primary key")
}),
"unexpected relation validation errors: {err}",
);
}
#[test]
fn scalar_128_bit_relation_targets_validate_at_schema_node_boundary() {
for (module, ident, primitive) in [
(
"schema_item_relation_int128_target",
"Int128Target",
Primitive::Int128,
),
(
"schema_item_relation_nat128_target",
"Nat128Target",
Primitive::Nat128,
),
] {
let fields = Box::leak(vec![field("id", primitive)].into_boxed_slice());
let target_path = insert_entity(module, ident, &["id"], fields);
relation_item(target_path, primitive)
.validate()
.expect("scalar 128-bit relation target should validate");
}
}
}