Java android room解析对象

Question

我必须要表，并且在secend类上的索引是一个伪造的关键，我该如何在1类和2类中获取对象

我有这个：

    @Entity(tableName = "director"/*,
            indices = {@Index(value = "full_name", unique = true)}*/)
    public class Director {
        @PrimaryKey(autoGenerate = true)
        @ColumnInfo(name = "did")
        public int id;
        @ColumnInfo(name = "full_name")
        @NonNull
        public String fullName;


@Entity(tableName = "movie",
        foreignKeys = @ForeignKey(entity = Director.class,
                parentColumns = "did",
                childColumns = "directorId",
                onDelete = ForeignKey.CASCADE),
        indices = {@Index("title"), @Index("directorId")})
public class Movie {
    @PrimaryKey(autoGenerate = true)
    @ColumnInfo(name = "mid")
    public int id;
    @ColumnInfo(name = "title")
    @NonNull
    public String title;
    @ColumnInfo(name = "directorId")
    public int directorId;

当我拿完所有电影时，都会得到导演id。我应该怎么做才能产生这个：

public class MovieWithDirector {

    Movie movie;
    Director director;
}

我可以得到一个用户，以后再获得directerByID，但是现在这不是最好的方法，我现在不知道