Book.java

@Table(database=MyLibrary.class)
public class Book extends BaseModel {
  @PrimaryKey(autoincrement = true)
  int id;
  @Column
  String title;
  @Column
  int pages;
  // Authors
  List<Author> authors;

  @OneToMany(methods = OneToMany.Method.ALL, variableName = "authors")
  public List<Author> oneToManyAuthors() {
    if (authors == null) {
      authors = SQLite.select()
              .from(Author.class)
              .where(Author_Table.book_id.eq(id))
              .queryList();
    }
    return authors;
  }
  
  Override
  public boolean save() {
    boolean res = super.save();
      if (authors != null) {
        for (Author s : authors) {
          s.setBook(this);
          s.save();
        }
      }
    return res;
  }
}