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From "Ramya (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OLINGO-1129) ODataJsonSerializer Does Not Support Derived Type in $expand Option
Date Wed, 05 Jul 2017 05:51:00 GMT

    [ https://issues.apache.org/jira/browse/OLINGO-1129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16074280#comment-16074280

Ramya commented on OLINGO-1129:

Hi Hui Wang,
The inline data is fetched based on the inline entity set by the service developer while creating
the service. The library just fetches this inline Entity and creates the response. When the
service developer creates links for every navigation property he also sets the inlineEntity.
When the url is http://host/service/Orders?$expand=Customer/Model.VipCustomer, the service
developer should create a link for navigation property Customer and set the inline entity
data to have all the properties of the derived type.

When the url is of the form http://host/service/Orders?$expand=Customer/Model.VipCustomer,
olingo library parses this url and sets the entryTypeFilter or collectionTypeFilter property
when parsing the expand options. In this case the navigation property Customer will include
the information regarding the type cast. This information can be fetched in the processor
classes created by the service developer like below
which will return UriResourceNavigation. Then use methods getTypeFilterOnEntry() or getTypeFilterOnCollection()
to fetch the type casting information. Based on the edm entity type fetched from previous
lines of code you can set correct inline entities for every navigation link created.


> ODataJsonSerializer Does Not Support Derived Type in $expand Option
> -------------------------------------------------------------------
>                 Key: OLINGO-1129
>                 URL: https://issues.apache.org/jira/browse/OLINGO-1129
>             Project: Olingo
>          Issue Type: New Feature
>          Components: odata4-server
>    Affects Versions: (Java) V4 4.3.0
>            Reporter: Hui Wang
>            Priority: Minor
> Currently we need to use type casting to a derived type in $expand. Here is the corresponding
part in the OData Protocol. 
> http://docs.oasis-open.org/odata/odata/v4.0/errata03/os/complete/part2-url-conventions/odata-v4.0-errata03-os-part2-url-conventions-complete.html#_Toc453752352
> To reproduce: 
> Here is an example URL provided in the documentation that could be used for reproducing
the defect: 
> http://host/service/Orders?$expand=Customer/Model.VipCustomer
> In the current 4.3 version, ODataJsonSerializer only deals with expand on Customer but
ignores the type filter Model.VipCustomer. It means, the response would only show the content
of super type Customer. Any custom properties in derived type VipCustomer wouldn't be returned.

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