Querying multiple collections with #where:

[Chris Muller]

As Brent mentions, have a look at the server-side processing of
where:.  You may be able to generalize it to do this, but it will
require some research and work as there is some complexity to the
MagmaCollection's.

MaQueryExecutor is a good place to start, but note a modern Omni
browser or the Tracing Messages Browser will suit you well to
researching this code as there are several layers.

Couldn't what you need be accomplished "manually?"

 - Chris

On 10/1/07, Burella Juan M. <juan.burella at gmail.com> wrote:
> Hi Chris. I need to do something like this:
>
> { aMagmaCollection1 . aMagmaCollection2 }
> where: [: readers |
> (readers first read: #name at: 'John Player') | (readers second read: #name
> at: 'Terry McKenzie') ].
>
> or if you prefer using the Smalltalk Collection protocol from this example:
>
> #(1 15 3 10 ) with: #(5 6 7 8) collect: [:i : j | (i max: j) ]
>
> and then we could write
>
> aMagmaCollection1 with: aMagmaCollection2
> where: [: reader1 : reader2 | (reader1 read: #name at: 'John Player') |
> (reader2 read: #name at: 'John Player')
>
> but this one would be limited to allow only two magma collections. We
> haven't found yet a simple way to do it and will be very glad if you could
> suggest how you would face the solution.
>
> I suppose this can be done this way:
>
> (readers first read: #name at: 'John Player') union: (readers second read:
> #name at: 'Terry McKenzie')
>
> but I think #where: is somewhat optimized (?).
>
> I'm using the latest Magma. Best regards.
> Juan M.
>
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