POSTing to Entity with ManyToMany(JoinTable) association resource [DATAREST-830]

Bharath Kumar Ramasubramanian opened DATAREST-830 and commented

I have the following entities
@Entity
@Table(name = "book")
public class Book implements java.io.Serializable {
.....
@ManyToMany(fetch = FetchType.LAZY,cascade=CascadeType.ALL)
@JoinTable(name = "book_author_link", joinColumns = { @JoinColumn(name = "BOOKID", nullable = false, updatable = false) }, inverseJoinColumns = { @JoinColumn(name = "AUTHORID", nullable = false, updatable = false) })
private Set<Author> authors;
.....
}

@Entity
@Table(name = "author")
public class Author implements java.io.Serializable {

//No back reference to Book(Keeping it uni-directional)
}

I want to create Book and Author's separately so I have separate repositories for both of them.
Say, first I have created an author and have its URI. Now when I want to create a Book (using POST-with its other fields), how do I pass the author URI. If author is OneToOne mapping resource, I can directly pass the URI and it would work, but here it is a many-to-many.

Is the only way here is to create a Book element(using POST and json) with all its fields (except Author) first and then use the "PATCH and text/uri" to add the author?

No further details from DATAREST-830