On Fri, 02 Jan 2015 06:45:30 -0200, Ilya Obshadko
<ilya.obsha...@gmail.com> wrote:
I'm trying to implement a Grid data source optimized for database
retrievals (with paging support). Basically it's derived from
HibernateGridDataSource from Tapestry distribution, and provides support
for complex Criteria queries:
https://gist.github.com/xfyre/ecb36a9173aed6a37f14
However, there is a problem with sorting.
Provided BeanModel implementation doesn't support nested properties; that
is, I cannot use properties of child Hibernate entities: <t:grid
include="property1, child1.property1, child2.property2" .../>results in
error.
Remember you're passing a Class instance for BeanModelSource, so the
properties which are actually recognized as the ones provided by the class
you passed, not subclass ones. That's how Java and strongly-typed
languages work: if you have a class C and a subclass S, if you ask Java
reflection classes or BeanModelSource to provide a list of properties of
C, only properties from C will appear.
Initially I had a workaround of having helper getter methods in
parent entity class, so it looked like <t:grid include="property1,
child1Property1, child2Property2" .../>. It worked, but when I'm trying
to use database-backed Grid data source, there's an error with sorting
(because sorting is performed on database level and obviously root entity
of the query doesn't contain database properties specified in Grid.
You receive the name of these properties, so it's up to your code to
handle this kind of situation (synthetic BeanModel properties).
I agree with Chris, whose opinion matches what Howard has been saying for
a long time in the Tapestry mailing list: the BeanModel classes and
components are meant to be used as a starting point, as scaffolding, as
tools to have something working quickly, but they're not supposed to
handle all scenarios by themselves.
--
Thiago H. de Paula Figueiredo
Tapestry, Java and Hibernate consultant and developer
http://machina.com.br
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