[JIRA] Created: (CAY-948) Implement flattened attributes in Cayenne

From: Andrus Adamchik (JIRA) ("Andrus)
Date: Sat Dec 22 2007 - 16:55:44 EST

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    Implement flattened attributes in Cayenne
    -----------------------------------------

                     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..econdaryTable 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..asic is EAGER, but it is configurable...) 

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