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Subject: [OASIS Issue Tracker] Created: (ODATA-276) Fix issues with entity references and rationalize with $links
Fix issues with entity references and rationalize with $links
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Key: ODATA-276
URL: http://tools.oasis-open.org/issues/browse/ODATA-276
Project: OASIS Open Data Protocol (OData) TC
Issue Type: Improvement
Components: OData ATOM Format v1.0, OData CSDL v1.0, OData JSON Format v1.0, OData Protocol v1.0, OData URL Conventions v1.0
Affects Versions: V4.0_WD01
Environment: [Proposed]
Reporter: Michael Pizzo
Fix For: V4.0_WD01
In adding Entity References in OData-199, we introduced a few issues.
First, we said that clients could return just references, in place of the actual entity, by putting $ref in the select clause. We then said it wasn't valid to include navigation properties with $ref in the select, but not other non-navigation properties. This is a bit arbitrary; the only data that needs to be returned an object is its references to other object(s); if links from those related objects are also of interest, they can be requested and retrieved as related links of those objects. Also, it's a bit strange to use $select for something that changes the type of object returned, from an entity to an entity reference; a path expression would be more suitable for this.
Second, adding a path representation for relationships gives us a way to rationalize/generalize the special semantics around $links that we have today. We can use the $ref path expression to refer to the links that are added/deleted/enumerated, and provide a consistent representation of an entity reference in the payload (rather than have entity references for referring to entities in one case, and a separate URI construct for referring to entities in another case).
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