[hibernate-dev] [OGM] Id generation strategies

[Gunnar Morling]

Hi,

I'm rather confused by the way how OgmIdentityGenerator,
OgmSequenceGenerator and OgmTableGenerator interact.

Basically, the first two just delegate to the latter. Now intuitively I'd
have expected an exception when explicitly using a generation type not
supported on a given datastore, say @GeneratedValue(strategy =
GenerationType.SEQUENCE) on MongoDB. But as we always delegate to the table
strategy, such exception is not raised.

Also several attributes of generator annotations are ignored; E.g.
naturally at SequenceGenerator.sequenceName(), but also
@TableGenerator.valueColumnName.

What has been the motivation behind this design?

I guess a change to GridDialect may be required for making explicit which
strategies are supported on a given backend.

Thanks,

--Gunnar