Entity References

Every single entity relation is mapped to an entity reference. Reference is an entity that has only its identifier. This reference is stored in identity map so you will get the same object reference when fetching the same document from database.

You can call await entity.init() to initialize the entity. This will trigger database call and populate itself, keeping the same reference in identity map.

const author = orm.em.getReference('...id...');

console.log(author.id); // accessing the id will not trigger any db call

console.log(author.isInitialized()); // false

console.log(author.name); // undefined

await author.init(); // this will trigger db call

console.log(author.isInitialized()); // true

console.log(author.name); // defined

← Back to table of contents