Hello,
I am using Struts 2 basic archtype version 2.0.1. I have been unsuccessful
in using DAO for deleting a child in a simple parent/child relationship.
Here are the steps that I took.
1. Create Master POJO:
@Entity
public class Parent extends BaseObject implements
java.io.Serializable {
private Long parentId;
private String parentName;
private List<Child> children = new
ArrayList<Child>();
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public Long getParentId() {
return this.parentId;
}
public void setParentId(Long parentId) {
this.parentId = parentId;
}
@Column(name="parent_name", length=50,
nullable=false)
public String getParentName() {
return parentName;
}
public void setParentName(String parentName) {
this.parentName = parentName;
}
@OneToMany(mappedBy="parent",
cascade=CascadeType.ALL,
fetch=FetchType.EAGER)
@OrderBy("childName")
public List<Child> getChildren() {
return children;
}
public void setChildren(List<Child> childen) {
this.children = children;
}
public void addChild(Child child) {
if (child == null)
throw new
IllegalArgumentException("Null child");
this.getChildren().add(child);
}
public void removeChild(Child child) {
this.getChildren().remove(child);
}
public Child findChild(String childName) {
Child child = null;
Iterator<Child> it =
children.iterator();
while (it.hasNext()) {
child = (Child)it.next();
if
(child.getChildName().equalsIgnoreCase(childName)) {
return child;
}
}
return null;
}
}
2. Create Child POJO:
@Entity
public class Child extends BaseObject implements
java.io.Serializable {
private Long childId;
private String childName;
private Parent parent;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public Long getChildId() {
return this.childId;
}
public void setChildId(Long childId) {
this.childId = childId;
}
@Column(name="child_name", length=50,
nullable=false)
public String getChildName() {
return childName;
}
public void setChildName(String childName) {
this.childName = childName;
}
@ManyToOne
@JoinColumn(name="parentId")
public Parent getParent() {
return parent;
}
public void setParent(Parent parent) {
this.parent = parent;
}
}
3. Add POJO names to hibernate.cfg.xml
<mapping class="com.appfuse.model.Parent" />
<mapping class="com.appfuse.model.Child" />
4. mvn appfuse:gen (for both Parent and Child)
5. mvn appfuse:install (for both Parent and Child)
6. mvn jetty:run-war
7. Here is the ParentDaoTest method that is failing
public void testAddAndRemoveChild() throws Exception {
Parent parent = new Parent();
parent = (Parent)parentDao.get(1L);
Child child = new Child();
child.setParent(parent);
child.setChildName("Child");
area.addChild(child);
parent = (Parent)parentDao.save(parent);
flush();
parent = (Parent)parentDao.get(parent.getParentId());
assertEquals(3, parent.getChildren().size());
child = parent.findChild("Child");
assertNotNull(child.getChildId());
parent.removeChild(child);
parent = (Parent)paretDao.save(parent);
flush();
parent = (Parent)parentDao.get(parent.getParentId());
assertEquals(2, parent.getChildren().size());
}
The insert of the child works correctly, but I am having problems getting
the child record removed. I am getting an Assertion error that the number
of children records is expected to be two (there are 2 other children on
this parent by default), but three records are returned. Also, I am not
seeing the delete SQL statement, but all others appear correctly.
Any help would be appreciated. Thanks.
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