Implement flattened attributes in Cayenne
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Key: CAY-948
URL: https://issues.apache.org/cayenne/browse/CAY-948
Project: Cayenne
Issue Type: Task
Components: Cayenne Core Library
Affects Versions: 3.0
Reporter: Andrus Adamchik
Assignee: Andrus Adamchik
Fix For: 3.0
We need to support flattened attributes in Cayenne.... JPA has a
@SecondaryTable annotation, that is essentially a one step flattened attribute
and IIRC Andriy implemented a similar mapping scenario long time ago (Cayenne
1.1), only without a Modeler support. So we need to finally make it official,
create test cases, modeler support, etc.
In Cayenne API terms, flattened attribute is an object attribute mapped over a
DbRelationship to a joined table column. A few things to consider:
* Whether to support multi-step flattened attributes
* Whether to load such attributes eagerly or lazily (JPA's default for @Basic
is EAGER, but it is configurable...)
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