nukak
Version:
flexible and efficient ORM, with declarative JSON syntax and smart type-safety
214 lines • 29 kB
JavaScript
import 'reflect-metadata';
import { hasKeys, lowerFirst, getKeys, upperFirst } from '../../util/index.js';
const holder = globalThis;
const metaKey = 'nukak/entity/decorator';
const metas = holder[metaKey] ?? new Map();
holder[metaKey] = metas;
export function defineField(entity, key, opts = {}) {
const meta = ensureMeta(entity);
if (!opts.type) {
const type = inferType(entity, key);
opts = { ...opts, type };
}
meta.fields[key] = { ...meta.fields[key], ...{ name: key, ...opts } };
return meta;
}
export function defineId(entity, key, opts) {
const meta = ensureMeta(entity);
const id = getIdKey(meta);
if (id) {
console.info(`Overriding ID property for '${entity.name}' from '${id}' to '${key}'`);
delete meta.fields[id];
}
return defineField(entity, key, { ...opts, isId: true });
}
export function defineRelation(entity, key, opts) {
if (!opts.entity) {
const inferredType = inferEntityType(entity, key);
opts.entity = () => inferredType;
}
const meta = ensureMeta(entity);
meta.relations[key] = { ...meta.relations[key], ...opts };
return meta;
}
export function defineEntity(entity, opts = {}) {
const meta = ensureMeta(entity);
if (!hasKeys(meta.fields)) {
throw TypeError(`'${entity.name}' must have fields`);
}
const onDeleteKeys = getKeys(meta.fields).filter((key) => meta.fields[key].onDelete);
if (onDeleteKeys.length > 1) {
throw TypeError(`'${entity.name}' must have one field with 'onDelete' as maximum`);
}
if (opts.softDelete) {
if (!onDeleteKeys.length) {
throw TypeError(`'${entity.name}' must have one field with 'onDelete' to enable 'softDelete'`);
}
meta.softDelete = onDeleteKeys[0];
}
meta.name = opts.name ?? entity.name;
let proto = Object.getPrototypeOf(entity.prototype);
while (proto.constructor !== Object) {
const parentMeta = ensureMeta(proto.constructor);
extendMeta(meta, parentMeta);
proto = Object.getPrototypeOf(proto);
}
const id = getIdKey(meta);
if (!id) {
throw TypeError(`'${entity.name}' must have one field decorated with @Id`);
}
meta.id = id;
return meta;
}
export function getEntities() {
return [...metas.entries()].reduce((acc, [key, val]) => {
if (val.id) {
acc.push(key);
}
return acc;
}, []);
}
function ensureMeta(entity) {
let meta = metas.get(entity);
if (meta) {
return meta;
}
meta = { entity, fields: {}, relations: {} };
metas.set(entity, meta);
return meta;
}
export function getMeta(entity) {
const meta = metas.get(entity);
if (!meta) {
throw TypeError(`'${entity.name}' is not an entity`);
}
if (meta.processed) {
return meta;
}
meta.processed = true;
return fillRelations(meta);
}
function fillRelations(meta) {
for (const relKey in meta.relations) {
const relOpts = meta.relations[relKey];
if (relOpts.references) {
// references were manually specified
continue;
}
if (relOpts.mappedBy) {
fillInverseSideRelations(relOpts);
continue;
}
const relEntity = relOpts.entity();
const relMeta = ensureMeta(relEntity);
if (relOpts.cardinality === 'mm') {
const idName = meta.fields[meta.id].name;
const relIdName = relMeta.fields[relMeta.id].name;
const source = lowerFirst(meta.name) + upperFirst(idName);
const target = lowerFirst(relMeta.name) + upperFirst(relIdName);
relOpts.references = [
{ local: source, foreign: meta.id },
{ local: target, foreign: relMeta.id },
];
}
else {
relOpts.references = [{ local: `${relKey}Id`, foreign: relMeta.id }];
}
if (relOpts.through) {
fillThroughRelations(relOpts.through());
}
}
return meta;
}
function fillInverseSideRelations(relOpts) {
const relEntity = relOpts.entity();
const relMeta = getMeta(relEntity);
relOpts.mappedBy = getMappedByRelationKey(relOpts);
if (relMeta.fields[relOpts.mappedBy]) {
relOpts.references = [{ local: relMeta.id, foreign: relOpts.mappedBy }];
return;
}
const mappedByRelation = relMeta.relations[relOpts.mappedBy];
if (relOpts.cardinality === 'm1' || relOpts.cardinality === 'mm') {
relOpts.references = mappedByRelation.references.slice().reverse();
relOpts.through = mappedByRelation.through;
return;
}
relOpts.references = mappedByRelation.references.map(({ local, foreign }) => ({
local: foreign,
foreign: local,
}));
}
function fillThroughRelations(entity) {
const meta = ensureMeta(entity);
meta.relations = getKeys(meta.fields).reduce((relations, key) => {
const { reference } = meta.fields[key];
if (reference) {
const relEntity = reference();
const relMeta = ensureMeta(relEntity);
const relKey = key.slice(0, -relMeta.id.length);
const relOpts = {
entity: reference,
cardinality: 'm1',
references: [{ local: key, foreign: relMeta.id }],
};
relations[relKey] = relOpts;
}
return relations;
}, {});
}
function getMappedByRelationKey(relOpts) {
if (typeof relOpts.mappedBy === 'function') {
const relEntity = relOpts.entity();
const relMeta = ensureMeta(relEntity);
const keyMap = getRelationKeyMap(relMeta);
return relOpts.mappedBy(keyMap);
}
return relOpts.mappedBy;
}
function getRelationKeyMap(meta) {
return getKeys(meta.fields)
.concat(getKeys(meta.relations))
.reduce((acc, key) => {
acc[key] = key;
return acc;
}, {});
}
function getIdKey(meta) {
const id = getKeys(meta.fields).find((key) => meta.fields[key]?.isId);
return id;
}
function extendMeta(target, source) {
const sourceFields = { ...source.fields };
const targetId = getIdKey(target);
if (targetId) {
const sourceId = getIdKey(source);
if (sourceId) {
delete sourceFields[sourceId];
}
}
target.fields = { ...sourceFields, ...target.fields };
target.relations = { ...source.relations, ...target.relations };
}
function inferType(entity, key) {
return Reflect.getMetadata('design:type', entity.prototype, key);
}
function inferEntityType(entity, key) {
const inferredType = inferType(entity, key);
const isValidType = isValidEntityType(inferredType);
if (!isValidType) {
throw TypeError(`'${entity.name}.${key}' type was auto-inferred with invalid type '${inferredType?.name}'`);
}
return inferredType;
}
export function isValidEntityType(type) {
return (typeof type === 'function' &&
type !== Boolean &&
type !== String &&
type !== Number &&
type !== BigInt &&
type !== Date &&
type !== Symbol &&
type !== Object);
}
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console.info(`Overriding ID property for '${entity.name}' from '${id}' to '${key}'`);\n    delete meta.fields[id];\n  }\n  return defineField(entity, key, { ...opts, isId: true });\n}\n\nexport function defineRelation<E>(entity: Type<E>, key: string, opts: RelationOptions<E>): EntityMeta<E> {\n  if (!opts.entity) {\n    const inferredType = inferEntityType(entity, key);\n    opts.entity = () => inferredType;\n  }\n  const meta = ensureMeta(entity);\n  meta.relations[key] = { ...meta.relations[key], ...opts };\n  return meta;\n}\n\nexport function defineEntity<E>(entity: Type<E>, opts: EntityOptions = {}): EntityMeta<E> {\n  const meta = ensureMeta(entity);\n\n  if (!hasKeys(meta.fields)) {\n    throw TypeError(`'${entity.name}' must have fields`);\n  }\n\n  const onDeleteKeys = getKeys(meta.fields).filter((key) => meta.fields[key].onDelete) as FieldKey<E>[];\n\n  if (onDeleteKeys.length > 1) {\n    throw TypeError(`'${entity.name}' must have one field with 'onDelete' as maximum`);\n  }\n\n  if (opts.softDelete) {\n    if (!onDeleteKeys.length) {\n      throw TypeError(`'${entity.name}' must have one field with 'onDelete' to enable 'softDelete'`);\n    }\n    meta.softDelete = onDeleteKeys[0];\n  }\n\n  meta.name = opts.name ?? entity.name;\n  let proto: FunctionConstructor = Object.getPrototypeOf(entity.prototype);\n\n  while (proto.constructor !== Object) {\n    const parentMeta = ensureMeta(proto.constructor as Type<E>);\n    extendMeta(meta, parentMeta);\n    proto = Object.getPrototypeOf(proto);\n  }\n\n  const id = getIdKey(meta);\n  if (!id) {\n    throw TypeError(`'${entity.name}' must have one field decorated with @Id`);\n  }\n  meta.id = id;\n\n  return meta;\n}\n\nexport function getEntities(): Type<unknown>[] {\n  return [...metas.entries()].reduce((acc, [key, val]) => {\n    if (val.id) {\n      acc.push(key);\n    }\n    return acc;\n  }, []);\n}\n\nfunction ensureMeta<E>(entity: Type<E>): EntityMeta<E> {\n  let meta = metas.get(entity);\n  if (meta) {\n    return meta;\n  }\n  meta = { entity, fields: {}, relations: {} };\n  metas.set(entity, meta);\n  return meta;\n}\n\nexport function getMeta<E>(entity: Type<E>): EntityMeta<E> {\n  const meta = metas.get(entity);\n  if (!meta) {\n    throw TypeError(`'${entity.name}' is not an entity`);\n  }\n  if (meta.processed) {\n    return meta;\n  }\n  meta.processed = true;\n  return fillRelations(meta);\n}\n\nfunction fillRelations<E>(meta: EntityMeta<E>): EntityMeta<E> {\n  for (const relKey in meta.relations) {\n    const relOpts = meta.relations[relKey as RelationKey<E>];\n\n    if (relOpts.references) {\n      // references were manually specified\n      continue;\n    }\n\n    if (relOpts.mappedBy) {\n      fillInverseSideRelations(relOpts);\n      continue;\n    }\n\n    const relEntity = relOpts.entity();\n    const relMeta = ensureMeta(relEntity);\n\n    if (relOpts.cardinality === 'mm') {\n      const idName = meta.fields[meta.id].name;\n      const relIdName = relMeta.fields[relMeta.id].name;\n      const source = lowerFirst(meta.name) + upperFirst(idName);\n      const target = lowerFirst(relMeta.name) + upperFirst(relIdName);\n      relOpts.references = [\n        { local: source, foreign: meta.id },\n        { local: target, foreign: relMeta.id },\n      ];\n    } else {\n      relOpts.references = [{ local: `${relKey}Id`, foreign: relMeta.id }];\n    }\n\n    if (relOpts.through) {\n      fillThroughRelations(relOpts.through());\n    }\n  }\n\n  return meta;\n}\n\nfunction fillInverseSideRelations<E>(relOpts: RelationOptions<E>): void {\n  const relEntity = relOpts.entity();\n  const relMeta = getMeta(relEntity);\n  relOpts.mappedBy = getMappedByRelationKey(relOpts);\n\n  if (relMeta.fields[relOpts.mappedBy as FieldKey<E>]) {\n    relOpts.references = [{ local: relMeta.id, foreign: relOpts.mappedBy }];\n    return;\n  }\n\n  const mappedByRelation = relMeta.relations[relOpts.mappedBy as RelationKey<E>];\n\n  if (relOpts.cardinality === 'm1' || relOpts.cardinality === 'mm') {\n    relOpts.references = mappedByRelation.references.slice().reverse();\n    relOpts.through = mappedByRelation.through;\n    return;\n  }\n\n  relOpts.references = mappedByRelation.references.map(({ local, foreign }) => ({\n    local: foreign,\n    foreign: local,\n  }));\n}\n\nfunction fillThroughRelations<E>(entity: Type<E>): void {\n  const meta = ensureMeta(entity);\n  meta.relations = getKeys(meta.fields).reduce((relations, key) => {\n    const { reference } = meta.fields[key as FieldKey<E>];\n    if (reference) {\n      const relEntity = reference();\n      const relMeta = ensureMeta(relEntity);\n      const relKey = key.slice(0, -relMeta.id.length);\n      const relOpts: RelationOptions = {\n        entity: reference,\n        cardinality: 'm1',\n        references: [{ local: key, foreign: relMeta.id }],\n      };\n      relations[relKey] = relOpts;\n    }\n    return relations;\n  }, {});\n}\n\nfunction getMappedByRelationKey<E>(relOpts: RelationOptions<E>): Key<E> {\n  if (typeof relOpts.mappedBy === 'function') {\n    const relEntity = relOpts.entity();\n    const relMeta = ensureMeta(relEntity);\n    const keyMap = getRelationKeyMap(relMeta);\n    return relOpts.mappedBy(keyMap);\n  }\n  return relOpts.mappedBy;\n}\n\nfunction getRelationKeyMap<E>(meta: EntityMeta<E>): RelationKeyMap<E> {\n  return getKeys(meta.fields)\n    .concat(getKeys(meta.relations))\n    .reduce((acc, key) => {\n      acc[key] = key;\n      return acc;\n    }, {} as RelationKeyMap<E>);\n}\n\nfunction getIdKey<E>(meta: EntityMeta<E>): IdKey<E> {\n  const id = getKeys(meta.fields).find((key) => meta.fields[key]?.isId);\n  return id as IdKey<E>;\n}\n\nfunction extendMeta<E>(target: EntityMeta<E>, source: EntityMeta<E>): void {\n  const sourceFields = { ...source.fields };\n  const targetId = getIdKey(target);\n  if (targetId) {\n    const sourceId = getIdKey(source);\n    if (sourceId) {\n      delete sourceFields[sourceId];\n    }\n  }\n  target.fields = { ...sourceFields, ...target.fields };\n  target.relations = { ...source.relations, ...target.relations };\n}\n\nfunction inferType<E>(entity: Type<E>, key: string): any {\n  return Reflect.getMetadata('design:type', entity.prototype, key);\n}\n\nfunction inferEntityType<E>(entity: Type<E>, key: string): Type<any> {\n  const inferredType = inferType(entity, key);\n  const isValidType = isValidEntityType(inferredType);\n  if (!isValidType) {\n    throw TypeError(`'${entity.name}.${key}' type was auto-inferred with invalid type '${inferredType?.name}'`);\n  }\n  return inferredType;\n}\n\nexport function isValidEntityType(type: unknown): type is Type<unknown> {\n  return (\n    typeof type === 'function' &&\n    type !== Boolean &&\n    type !== String &&\n    type !== Number &&\n    type !== BigInt &&\n    type !== Date &&\n    type !== Symbol &&\n    type !== Object\n  );\n}\n"]}