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https://issues.apache.org/jira/browse/OLINGO-1221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16341048#comment-16341048
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Frederik Zimmer commented on OLINGO-1221:
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I have attached a patch that should fix the bug.
> Expand on navigation property of derived type not working
> ---------------------------------------------------------
>
> Key: OLINGO-1221
> URL: https://issues.apache.org/jira/browse/OLINGO-1221
> Project: Olingo
> Issue Type: Bug
> Components: odata4-server
> Affects Versions: (Java) V4 4.4.0
> Reporter: Frederik Zimmer
> Priority: Major
> Attachments:
> OLINGO1221-Expand-on-navigation-property-of-derived-.patch
>
>
> I want to expand a navigation property that is defined in a derived type. So
> something like this:
> http://services.odata.org/TripPinRESTierService/People('ursulabright')/Friends?$expand=Microsoft.OData.Service.Sample.TrippinInMemory.Models.Manager/DirectReports
> where Friends returns a Collections of Person which can be a Manager and only
> a Manager has a navigation property DirectReports.
> Olingo would return an error in this case that Person has no property
> DirectReports. The reason is that the type cast is correctly parsed but it is
> ignored. In the class ExpandParser Method parseExpandPath the navigation
> property is looked up in type but it could be that a type cast in
> item.getStartTypeFilter() is defined which contains the derived type that
> should be used.
> An additional question:
> In my understanding the above URL should return all Friends of ursulabright
> and for Friends who are of type Manager also the DirectReports should be
> returned. Is this correct (the example odata service unfortunately has some
> problem with this query)?
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