Luther Baker schrieb:
I have an entity that contains another entity - but this time, the contained
entity table is quite finite - say, 10 rows.
public class Category
{
private String name;
}
public class User
{
private String firstName;
private String lastName;
private Category category;
}
and in this case, I'd like to render firstName, lastName and a DROP DOWN or
some type of picker from existing Categories.
Would I need to create my own t:form ... and possibly use a t:BeanEditor
with a custom drop down/picker -- or is this type of idiom encapsulated in a
Tapestry component already?
Thanks much,
-Luther
Indeed you'll have to create a BeanBlockContribution and contribute it to the BeanBlockSource
service. This contribution tells tapestry where to look for the component, that is responsible for
rendering your type. Additionally you'll have to contribute your type to the DefaultDataTypeAnalyzer
service. That could look something along the lines of
public static void contributeDefaultDataTypeAnalyzer(
MappedConfiguration<Class, String> configuration)
{
configuration.add(Category.class, "category");
}
public static void
contributeBeanBlockSource(Configuration<BeanBlockContribution> configuration)
{
configuration.add(new BeanBlockContribution("category", "AppPropertyEditBlocks", "category",
true));
}
AppPropertyEditBlocks is the name of a page that contains a component with the id "category" that is
responsible for rendering your category. In your case this would be a select component:
@Environmental
private PropertyEditContext context;
@Component(parameters =
{ "value=context.propertyValue", "label=prop:context.label",
"model=prop:categoryModel", "encoder=prop:categoryEncoder",
"clientId=prop:context.propertyId", "validate=prop:validator" })
private Select category;
@Inject
private PropertyAccess propertyAccess;
@SuppressWarnings({ "unused", "unchecked" })
public FieldValidator getValidator()
{
return context.getValidator(category);
}
public PropertyEditContext getContext() { return context; }
public SelectModel<Category> getCategoryModel()
{
...
}
public ValueEncoder<Category> getCategoryEncoder()
{
...
}
with the corresponding .tml:
<div xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";>
<t:block t:id="category">
<t:label for="category" />
<t:select t:id="category" />
</t:block>
</div>
I believe that there is also some information about this on the wiki, check it
out!
HTH,
Uli
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