[CAUSEWAY-691] In Wicket viewer, improve drop-down list's handling of null entity or values

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: archetype-quickstart-wrj-1.3.1, viewer-wicket-1.3.1, core-1.3.0
• Fix Version/s: archetype-quickstart-wrj-1.4.0, viewer-wicket-1.4.0, core-1.4.0
• Component/s: Core, Viewer Wicket
• Assignee: Daniel Keir Haywood
• Reporter: Daniel Keir Haywood
• Created: 06/Feb/14 13:59
• Updated: 20/Feb/15 14:07
• Resolved: 06/Feb/14 14:53

Description

Several issues:
1. for entities, if the reference is null, the drop-down (EntityLinkSelect2Panel) always shows the first object in edit mode
2. for value types (eg enums), it is not possible to set a null value

~~~
To replicate (1) add the following property to the simple archetype's SimpleObject class:

// //////////////////////////////////////
// other (property)
// //////////////////////////////////////

private SimpleObject other;

@Column(allowsNull="true")
@MemberOrder(sequence = "1")
// @Mandatory
public SimpleObject getOther()

{ return other; }

public void setOther(final SimpleObject other)

{ this.other = other; }

public List<SimpleObject> choicesOther()

{ List<SimpleObject> list = container.allInstances(SimpleObject.class); return list; }

~~~
To replicate (2),

ToDoItem

@javax.jdo.annotations.Column(allowsNull="true")
public Subcategory getSubcategory() {

and

ToDoItemContributions

public ToDoItem updateCategory(
final ToDoItem item,
final @Named("Category") Category category,
final @Optional @Named("Subcategory") Subcategory subcategory)

{ ... }

and

public static enum Category {
Professional {
@Override
public List<Subcategory> subcategories()

{ return Arrays.asList(null, Subcategory.OpenSource, Subcategory.Consulting, Subcategory.Education); }

}, Domestic {
@Override
public List<Subcategory> subcategories()

{ return Arrays.asList(null, Subcategory.Shopping, Subcategory.Housework, Subcategory.Garden, Subcategory.Chores); }

}, Other {
@Override
public List<Subcategory> subcategories()

{ return Arrays.asList(null, Subcategory.Other); }

};

public abstract List<Subcategory> subcategories();
}