[odb-users] Defining multiple PKs - needed to define also comparison members

[Boris Kolpackov]

Hi Nicholas,

Nicholas Cremonesi <nicholas.cremonesi at gmail.com> writes:

> "value type that is used as object id in persistent class with session
> support does not define the less than (<) comparison"
> 
> I'm using the exact code you provided so, how can I avoid this error?
> The multiple PK I'll define will contain two values of type "string". Is it
> essential to define <, >, = comparators?

See Section 7.2.1, "Composite Object Ids".

Boris