Ebean manyToMany沒有保存在交易

Question

我使用Ebean的play-framework 2.2.1。我在學生和學校課之間有許多關係。

在交易中，創建schoolClass，添加到Student並保存時，相應的橋表未填滿。

@Entity 
public class Student extends Model { 
    ... 

    @ManyToMany(cascade = CascadeType.ALL) 
    public List<SchoolClass> schoolClasses = new ArrayList<SchoolClass>(); 
} 

@Entity 
public class SchoolClass extends Model { 
    ... 

    @ManyToMany(mappedBy = "schoolClasses") 
    public List<Student> students = new ArrayList<Student>(); 
} 

代碼：

try { 
    Ebean.beginTransaction(); 

    ... 
    Student student = new Student(); 
    student.schoolClasses.add(schoolClass); 
    student.save(); 

    Ebean.commitTransaction(); 
} finally { 
    Ebean.endTransaction(); 
} 

任何想法？

Answer 1

我曾經經歷過類似的問題，你可以嘗試這樣的：

List<SchoolClass> classes = new ArrayList<SchoolClass>(); 
classes.add(schoolClass); 
student.schoolClasses.addAll(classes);