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. 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. Is there any reasonable solution for that, besides manually providing all required mappings between Grid property names and database property names? -- Ilya Obshadko
