Jay Xu created OLINGO-1096:
------------------------------
Summary: Model as Singleton or EntitySet
Key: OLINGO-1096
URL: https://issues.apache.org/jira/browse/OLINGO-1096
Project: Olingo
Issue Type: Question
Reporter: Jay Xu
In DMTF redfish schema ```ServiceRoot```, it defines
```
<Schema xmlns="http://docs.oasis-open.org/odata/ns/edm";
Namespace="ServiceRoot.v1_1_1">
<EntityContainer Name="ServiceContainer"
Extends="ServiceRoot.v1_0_0.ServiceContainer">
<Singleton Name="StorageSystems"
Type="StorageSystemCollection.StorageSystemCollection"/>
<Singleton Name="StorageServices"
Type="StorageServiceCollection.StorageServiceCollection"/>
<Singleton Name="Fabrics" Type="FabricCollection.FabricCollection"/>
<Singleton Name="UpdateService" Type="UpdateService.UpdateService"/>
</EntityContainer>
<EntityType Name="ServiceRoot" BaseType="ServiceRoot.v1_1_0.ServiceRoot"/>
</Schema>
```
Here is the schema definition of StorageSystemCollection:
```
<Schema xmlns="http://docs.oasis-open.org/odata/ns/edm";
Namespace="StorageSystemCollection">
<EntityType Name="StorageSystemCollection"
BaseType="Resource.v1_0_0.ResourceCollection">
<Annotation Term="OData.Description" String="A Collection of
ComputerSystem resource instances that each have an entry in HostingRoles set
to 'StorageServer'."/>
<Annotation Term="OData.LongDescription" String="An instance of this
resource shall reference the set of ComputerSystem resources known in the scope
of its use and and that has a HostingRoles entry with a value of
'StorageServer'."/>
<NavigationProperty Name="Members"
Type="Collection(ComputerSystem.ComputerSystem)" Nullable="false">
<Annotation Term="OData.Permissions"
EnumMember="OData.Permission/Read"/>
<Annotation Term="OData.Description" String="The value of each member
references a Storage System resource."/>
<Annotation Term="OData.LongDescription" String="The value of each
member entry shall reference a ComputerSystem resource that shall have a
HostingRoles entry with a value of 'StorageServer'."/>
<Annotation Term="OData.AutoExpandReferences"/>
</NavigationProperty>
</EntityType>
...
```
It is allowed to have the URL to access the singleton instance and one of its
members as follow:
/redfish/v1/StorageSystems
/redfish/v1/StorageSystems('Simple')
I tried to model StorageSystems as a singleton, but it is reported by Olingo
that /redfish/v1/StorageSystem('Simple') is malformed. If I model it as
EntitySet which type is ComputerSystem, the type info of
StorageSystemCollection is missing.
Could you please show me a light on that?
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