[jira] [Commented] (OLINGO-1221) Expand on navigation property of derived type not working

["Frederik Zimmer (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OLINGO-1221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16341048#comment-16341048 ] 

Frederik Zimmer commented on OLINGO-1221:
-----------------------------------------

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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