[Nitro] composite primary key

[George Moschovitis]

>   set_primary_key :volume, :accession, :page
>   belongs_to :document, Document
> end

Most of the infrastructure to do this is already in place. I 'll
rework the missing details for the next version.
 
> Does Og
> currently handle adding constraints to tables it creates?

yeah, add an :sql_constrain to your class, ie

meta :sql_constrain, 'your sql constrain here'


regards,
George.

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