I'll give you what advice I do know.  I'm not sure it will fully help 
you with your situation but it may help you to rethink your strategies.

First, make sure your tables are normalized before assigning 
associations to them.  If you are going to work with HABTM then 3NF or 
greater..

The larger the query the better.  Smaller queries are worse than one 
enormously large query because rails caches that query for use and 
doesn't have to go out and do another.. and another..

It will be less of a problem to process the data once you have it so I 
wouldn't worry about data processing at this point.  It's better to just 
get the design and associations going.

Without seeing your models, it's more difficult to guess what may be 
right or wrong from a design point.  You might want to state exactly how 
many models you have, what tables and relationships you currently have 
associated which will help tie into your original topic.

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