On 14 Jun., 23:05, Michael Koziarski <[email protected]> wrote:
> On Friday, 15 June 2012 at 4:54 AM, Luís Ferreira wrote:
> > Hi,
>
> > Is there any particular reason why AR does not support composite primary 
> > keys? This looks like a pretty nice feature to add.
>
> Because outside of people with 'legacy schemas' there's not really a large 
> number of compelling use cases that justify the additional complexity.  It's 
> not just a matter of making find take two arguments, you also have to bake 
> that support into all the associations etc.
>
> On the whole, no one has felt particularly compelled to do the large amount 
> of work when you can work around the limitation by just using a standard 
> primary key with a unique index for your composite values.

Dr. Nic did it: https://github.com/drnic/composite_primary_keys

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