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Subject: [OASIS Issue Tracker] Commented: (ODATA-476) Clarify that type-cast segments are NOT required for properties of derived types in system query options
[ http://tools.oasis-open.org/issues/browse/ODATA-476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=34765#action_34765 ]
Ralf Handl commented on ODATA-476:
----------------------------------
Correct.
GET ~/Things?$select=ID,Self.Device/State
will return all things with their ID, and the State for all things that are a Device.
The question is rather: what do I get when I request
GET ~/Things?$select=ID,State
What I want is: all things, and the State for each thing that has one:
- the string for the Address
- the DeviceState for the Device
- the value of the dynamic property State for those entities that have one (supposed Thing is an open entity type)
If we make the type-cast required, the request would have to list all flavors of State that have been declared across the type hierarchy.
> Clarify that type-cast segments are NOT required for properties of derived types in system query options
> --------------------------------------------------------------------------------------------------------
>
> Key: ODATA-476
> URL: http://tools.oasis-open.org/issues/browse/ODATA-476
> Project: OASIS Open Data Protocol (OData) TC
> Issue Type: Improvement
> Components: OData URL Conventions
> Affects Versions: V4.0_CS01
> Environment: [Proposed]
> Reporter: Ralf Handl
> Fix For: V4.0_CSD03
>
>
> We allow type-cast segments in expressions, but we don't specify whether they are required.
> As a property name is unique within an instance, the type-cast segment is not necessary for evaluating the expression.
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