[jira] Assigned: (OPENJPA-704) FetchPlan should be able to add fields by both declaring and defining class as owner

["Pinaki Poddar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OPENJPA-704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Pinaki Poddar reassigned OPENJPA-704:
-------------------------------------

    Assignee: Pinaki Poddar

> FetchPlan should be able to add fields by both declaring and defining class as owner
> ------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-704
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-704
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: kernel
>            Reporter: Pinaki Poddar
>            Assignee: Pinaki Poddar
>             Fix For: 1.3.0
>
>
> A field f can be added to FetchPlan via
> FetchPlan.addField(String name);
> FetchPlan.addField(Class c, String fieldName);
> At runtime, whether the field f is included in a fetch subgraph is verified by its fully-qualified name which considers its declaring class. This limits the following usage as originally reported by Michael Vorburger in [1]
> abstract class Base { String code; }
> @Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
> class A extends Base { B b; }
> @Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
> class B extends Base { }
> With the above entity model, there is no existing means to include {A.b, A.b.code} and exclude {A.code} from being fetched using addField() mechanism. Because a plan
> fetchPlan.addField(A.class, "b");
> fetchPlan.addField(B.class, "code");
> will result in checking for field whose fully-qualified name of 'Base.code' and will not include A.b.code.
> Instead if the plan is defined as
> fetchPlan.addField(A.class, "b");
> fetchPlan.addField(Base.class, "code");
> The resultant fetch will include  {A.code, A.b, A.b.code} i.e. 'code' field from both A and B. 
>  
> [1] http://n2.nabble.com/Fetch-Group-questions-tc534861.html

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