Working with collections in MikroORM

working-with-collections.ts

// find author and populate his books collection
const author = orm.em.findOne(Author, '...', ['books']);

for (const book of author.books) {
  console.log(book); // instance of Book
}

author.books.add(book);
console.log(author.books.contains(book)); // true
author.books.remove(book);
console.log(author.books.contains(book)); // false
author.books.add(book);
console.log(author.books.count()); // 1
console.log(author.books.getItems()); // Book[]
console.log(author.books.getIdentifiers()); // array of primary keys of all items
author.books.removeAll();