在使用spring 的 form 表单的时候,不知道如何绑定一个对象的属性。
如下:
Teacher 类
@Entity
@Table(name = "la_TEACHER")
public class Teacher extends IdEntity {
private String name;
// 老师的课程
private Set<Lesson> lessons;
@OneToMany(mappedBy = "teacher", cascade = CascadeType.ALL)
public Set<Lesson> getLessons() {
return lessons;
}
public void setLessons(Set<Lesson> lessons) {
this.lessons = lessons;
}
}
Lesson 类
@Entity
@Table(name = "LA_LESSON")
public class Lesson extends IdEntity {
//课题
private String name;
//老师
private Teacher teacher;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@ManyToOne(targetEntity = Teacher.class)
@JoinColumn(name = "teacher",nullable = false)
public Teacher getTeacher() {
return teacher;
}
public void setTeacher(Teacher teacher) {
this.teacher = teacher;
}
}
在lesson 的表单中, 使用select 来选择课程的教师,如下
总是返回到 400 错误页面去了,没有其他的错误属性。 请熟悉spring from 的朋友帮忙看看怎么解决!谢谢!