Primefaces Update Entity via dialog

Question

I essentially have parent / child groups and I want to be able to add a new new child group. The groups are database tables which are basically just a name and are mapped as simple POJO via JPA.

The one slight level of complexity is the mast source of parent groups is from a different source which returns List<String> of names.

The problem I have is that no matter what I seem to try when addChildGroup gets called the parent group is null and this fails.

My JSF is

    <h:form id="form">
        <p:selectOneListbox id="groupSelector" value="#{myBean.groupName}">
            <p:ajax listener="#{myBean.loadChildGroups}" update="selectedGroup,:form:childGroupSelector" />
            <f:selectItems value="#{myOtherBean.groupNames}" />
        </p:selectOneListbox>

        <h2>Selected Group is:
            <h:outputText id="selectedGroup" value="#{myBean.group.groupName}" />
        </h2>

        <p:selectOneListbox id="childGroupSelector" value="#{myBean.childGroup}">
            <f:selectItems value="#{myBean.childGroups}" />
        </p:selectOneListbox>
        <p:commandButton value="Add" onclick="PF('groupNameDlg').show()" />

        <p:dialog id="inputGroupName" widgetVar="groupNameDlg" header="Enter Child Group Name" modal="true">
            <p:ajax event="close" listener="#{myBean.loadChildGroups}" update=":form:childGroupSelector" />
            <p>Enter a group name</p>
            <p:outputLabel for="groupNameText" value="Enter Group Name" styleClass="screen-reader-offscreen" />
            <p:inputText id="groupNameText" value="#{myBean.childGroupName}" />
            <br /> <br />
            <p:commandButton value="Add" action="#{myBean.addChildGroup}" icon="pi pi-check"
                styleClass="ui-button-success p-mr-2" oncomplete="PF('groupNameDlg').hide()" />
            <p:commandButton value="Cancel" onclick="PF('groupNameDlg').hide()" />
        </p:dialog>

    </h:form>

and the bean behind that is

@ManagedBean(name = "myBean", eager = true)
@ViewScoped
public class MyBean implements Serializable {

    private String groupName; // Name of selected group
    private Group group; // Selected Group
    
    private List<ChildGroup> childGroups; // list of child groups
    private ChildGroup childGroup; //Selected Child Group
    private String childGroupName; //Child Group to be added

    @Inject
    private MyService myService;

    public void loadChildGroups() {
        group = myService.findGroupByName(groupName);
        if (group == null) {
            group = new Group(groupName);
            myService.saveGroup(group); // Just calls persist
        }
        childGroups = group.getChildGroups(); // Get children via JPA OneToMany
        if (approvalGroups.isEmpty()) {
            //No existing groups so seed default approver group record
            ChildGroup cg = new ChildGroup(group, "default");
            myService.saveChildGroup(cg); // Just calls persist
            childGroups.add(cg);
        }
    }

    public void addChildGroup() {
        ChildGroup cg = new ChildGroup(group, childGroupName);
        myService.saveChildGroup(cg); // Just calls persist   
        childGroups.add(cg);
    }
    
}

When I open the page I can select items from the parent list and this correctly updates the text and the list of child groups fine (so group is set there) but when I try to add a new child group then call to addChildGroup fails as group is null

I thought that as this was all on the same page that ViewScoped should keep everything but I am obviously missing something.

Primefaces Update Entity via dialog

0 Answers0