can somebody confirm me following?
I have following Entites:
public class Book {
.............
}
public class Student {
@OneToOne
Book favoriteBook
}
public class StudentOrderHistory{
Student student;
@OneToOne
Book lastBook;
}
In case if favoriteBook / lastBook is linked only to each one Student or StudentOrderHistory is both then still a @OneToOne relation or would it a @ManyToOne Relation because the same BookEntity is linked in several Entites (here Student and StudentOrderHistory)?
Is it correct that @ManyToOne would be more in case e.g the same book is the favoriteBook for different Students?
I assume that many students could have the same favourite book, this makes it a many-to-one:
This means that two different students can have the same book as their favourites. Example: John and Jane favourite book is "Moby Dick"
Unless a Student can have multiple order histories, I would say that that's a one-to-one:
Because the history of orders is unique for each students.
Not sure about
lastBook
though. If it means that a student has the book and nobody else can have it aslastBook
, than it's a one-to-one:This book only belongs to this
StudentOrderHistory
and therefore to a single student. If you mean the last book they've ordered and in the meanwhile, somebody else has ordered the same book, than it's a many-to-one:It seems that two different students could order the same book, but without knowing more it's hard to say which solution is correct.