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EntityLoader.ts
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EntityLoader.ts
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import { AnyEntity, EntityProperty, FilterQuery } from '../typings';
import { EntityManager } from '../index';
import { ReferenceType, LoadStrategy } from './enums';
import { Utils, ValidationError } from '../utils';
import { Collection } from './Collection';
import { QueryOrder, QueryOrderMap } from '../enums';
import { Reference } from './Reference';
import { wrap } from './wrap';
import { PopulateOptions } from '../drivers';
export class EntityLoader {
private readonly metadata = this.em.getMetadata();
private readonly driver = this.em.getDriver();
constructor(private readonly em: EntityManager) { }
async populate<T extends AnyEntity<T>>(entityName: string, entities: T[], populate: PopulateOptions[] | boolean, where: FilterQuery<T> = {}, orderBy: QueryOrderMap = {}, refresh = false, validate = true, lookup = true): Promise<void> {
if (entities.length === 0 || populate === false) {
return;
}
populate = this.normalizePopulate(entityName, populate, lookup);
const invalid = populate.find(({ field }) => !this.em.canPopulate(entityName, field));
if (validate && invalid) {
throw ValidationError.invalidPropertyName(entityName, invalid.field);
}
for (const pop of populate) {
await this.populateField<T>(entityName, entities, pop.field, where, orderBy, refresh);
}
}
private normalizePopulate(entityName: string, populate: PopulateOptions[] | true, lookup: boolean): PopulateOptions[] {
if (populate === true || populate.some(p => p.all)) {
populate = this.lookupAllRelationships(entityName);
} else {
populate = Utils.asArray(populate);
}
if (lookup) {
populate = this.lookupEagerLoadedRelationships(entityName, populate);
}
return populate;
}
/**
* preload everything in one call (this will update already existing references in IM)
*/
private async populateMany<T extends AnyEntity<T>>(entityName: string, entities: T[], field: keyof T, where: FilterQuery<T>, orderBy: QueryOrderMap, refresh: boolean): Promise<AnyEntity[]> {
// set populate flag
entities.forEach(entity => {
if (Utils.isEntity(entity[field], true) || entity[field] as unknown instanceof Collection) {
wrap(entity[field], true).populated();
}
});
const prop = this.metadata.get<T>(entityName).properties[field as string];
const filtered = this.filterCollections<T>(entities, field, refresh);
const innerOrderBy = Utils.isObject(orderBy[prop.name]) ? orderBy[prop.name] : undefined;
if (prop.reference === ReferenceType.MANY_TO_MANY && this.driver.getPlatform().usesPivotTable()) {
return this.findChildrenFromPivotTable<T>(filtered, prop, field, refresh, where[prop.name], innerOrderBy as QueryOrderMap);
}
const subCond = Utils.isPlainObject(where[prop.name]) ? where[prop.name] : {};
const data = await this.findChildren<T>(entities, prop, refresh, subCond, innerOrderBy as QueryOrderMap);
this.initializeCollections<T>(filtered, prop, field, data);
return data;
}
private initializeCollections<T extends AnyEntity<T>>(filtered: T[], prop: EntityProperty, field: keyof T, children: AnyEntity[]): void {
if (prop.reference === ReferenceType.ONE_TO_MANY) {
this.initializeOneToMany<T>(filtered, children, prop, field);
}
if (prop.reference === ReferenceType.MANY_TO_MANY && !prop.owner && !this.driver.getPlatform().usesPivotTable()) {
this.initializeManyToMany<T>(filtered, children, prop, field);
}
}
private initializeOneToMany<T extends AnyEntity<T>>(filtered: T[], children: AnyEntity[], prop: EntityProperty, field: keyof T): void {
for (const entity of filtered) {
const items = children.filter(child => Utils.unwrapReference(child[prop.mappedBy]) as object === entity);
(entity[field] as unknown as Collection<AnyEntity>).hydrate(items);
}
}
private initializeManyToMany<T extends AnyEntity<T>>(filtered: T[], children: AnyEntity[], prop: EntityProperty, field: keyof T): void {
for (const entity of filtered) {
const items = children.filter(child => (child[prop.mappedBy] as object as Collection<AnyEntity>).contains(entity));
(entity[field] as unknown as Collection<AnyEntity>).hydrate(items);
}
}
private async findChildren<T extends AnyEntity<T>>(entities: T[], prop: EntityProperty, refresh: boolean, where: FilterQuery<T>, orderBy?: QueryOrderMap): Promise<AnyEntity[]> {
const children = this.getChildReferences<T>(entities, prop, refresh);
const meta = this.metadata.get(prop.type);
let fk = Utils.getPrimaryKeyHash(meta.primaryKeys);
if (prop.reference === ReferenceType.ONE_TO_MANY || (prop.reference === ReferenceType.MANY_TO_MANY && !prop.owner)) {
fk = meta.properties[prop.mappedBy].name;
}
if (prop.reference === ReferenceType.ONE_TO_ONE && !prop.owner && !this.em.config.get('autoJoinOneToOneOwner')) {
children.length = 0;
children.push(...entities);
fk = meta.properties[prop.mappedBy].name;
}
if (children.length === 0) {
return [];
}
const ids = Utils.unique(children.map(e => Utils.getPrimaryKeyValues(e, wrap(e, true).__meta.primaryKeys, true)));
where = { [fk]: { $in: ids }, ...where };
orderBy = orderBy || prop.orderBy || { [fk]: QueryOrder.ASC };
return this.em.find<T>(prop.type, where, { orderBy, refresh });
}
private async populateField<T extends AnyEntity<T>>(entityName: string, entities: T[], field: string, where: FilterQuery<T>, orderBy: QueryOrderMap, refresh: boolean): Promise<void> {
if (!field.includes('.')) {
return void await this.populateMany<T>(entityName, entities, field as keyof T, where, orderBy, refresh);
}
// nested populate
const [f, ...parts] = field.split('.');
await this.populateMany<T>(entityName, entities, f as keyof T, where, orderBy, refresh);
const children: T[] = [];
for (const entity of entities) {
if (Utils.isEntity(entity[f])) {
children.push(entity[f]);
} else if (entity[f] instanceof Reference) {
children.push(entity[f].unwrap());
} else if (entity[f] as object instanceof Collection) {
children.push(...entity[f].getItems());
}
}
const filtered = Utils.unique(children);
const prop = this.metadata.get(entityName).properties[f];
await this.populate<T>(
prop.type,
filtered,
[{
field: parts.join('.'),
strategy: LoadStrategy.SELECT_IN,
}],
where[prop.name],
orderBy[prop.name] as QueryOrderMap,
refresh,
false,
false
);
}
private async findChildrenFromPivotTable<T extends AnyEntity<T>>(filtered: T[], prop: EntityProperty, field: keyof T, refresh: boolean, where?: FilterQuery<T>, orderBy?: QueryOrderMap): Promise<AnyEntity[]> {
const map = await this.driver.loadFromPivotTable(prop, filtered.map(e => wrap(e, true).__primaryKeys), where, orderBy, this.em.getTransactionContext());
const children: AnyEntity[] = [];
for (const entity of filtered) {
const items = map[wrap(entity, true).__serializedPrimaryKey as string].map(item => this.em.merge(prop.type, item, refresh));
(entity[field] as unknown as Collection<AnyEntity>).hydrate(items);
children.push(...items);
}
return children;
}
private getChildReferences<T extends AnyEntity<T>>(entities: T[], prop: EntityProperty<T>, refresh: boolean): AnyEntity[] {
const filtered = this.filterCollections(entities, prop.name, refresh);
const children: AnyEntity[] = [];
if (prop.reference === ReferenceType.ONE_TO_MANY) {
children.push(...filtered.map(e => (e[prop.name] as unknown as Collection<T>).owner));
} else if (prop.reference === ReferenceType.MANY_TO_MANY && prop.owner) {
children.push(...filtered.reduce((a, b) => [...a, ...(b[prop.name] as unknown as Collection<AnyEntity>).getItems()], [] as AnyEntity[]));
} else if (prop.reference === ReferenceType.MANY_TO_MANY) { // inversed side
children.push(...filtered);
} else { // MANY_TO_ONE or ONE_TO_ONE
children.push(...this.filterReferences(entities, prop.name, refresh));
}
return children;
}
private filterCollections<T extends AnyEntity<T>>(entities: T[], field: keyof T, refresh: boolean): T[] {
if (refresh) {
return entities.filter(e => e[field]);
}
return entities.filter(e => Utils.isCollection(e[field]) && !(e[field] as unknown as Collection<AnyEntity>).isInitialized(true));
}
private filterReferences<T extends AnyEntity<T>>(entities: T[], field: keyof T, refresh: boolean): T[keyof T][] {
const children = entities.filter(e => Utils.isEntity(e[field], true));
if (refresh) {
return children.map(e => Utils.unwrapReference(e[field]));
}
return children.filter(e => !wrap(e[field], true).isInitialized()).map(e => Utils.unwrapReference(e[field]));
}
private lookupAllRelationships(entityName: string, prefix = '', visited: string[] = []): PopulateOptions[] {
if (visited.includes(entityName)) {
return [];
}
visited.push(entityName);
const ret: PopulateOptions[] = [];
const meta = this.metadata.get(entityName);
Object.values(meta.properties)
.filter(prop => prop.reference !== ReferenceType.SCALAR)
.forEach(prop => {
const prefixed = prefix ? `${prefix}.${prop.name}` : prop.name;
const nested = this.lookupAllRelationships(prop.type, prefixed, visited);
if (nested.length > 0) {
ret.push(...nested);
} else {
ret.push({
field: prefixed,
strategy: LoadStrategy.SELECT_IN,
});
}
});
return ret;
}
private lookupEagerLoadedRelationships(entityName: string, populate: PopulateOptions[], prefix = '', visited: string[] = []): PopulateOptions[] {
if (visited.includes(entityName)) {
return [];
}
visited.push(entityName);
const meta = this.metadata.get(entityName);
Object.values(meta.properties)
.filter(prop => prop.eager)
.forEach(prop => {
const prefixed = prefix ? `${prefix}.${prop.name}` : prop.name;
const nested = this.lookupEagerLoadedRelationships(prop.type, [], prefixed, visited);
if (nested.length > 0) {
populate.push(...nested);
} else {
populate.push({
field: prefixed,
strategy: LoadStrategy.SELECT_IN,
});
}
});
return populate;
}
}