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+1  Q: 

Ruby on Rails: Instantiate associated models with find_by_sql?

Apparently, include and select can't be used simultaneously on a Rails find query, and this has been repeatedly marked as wontfix:
http://dev.rubyonrails.org/ticket/7147
http://dev.rubyonrails.org/ticket/5371

This strikes me as very inconvenient, because the times I'd want to use include are exactly the same times I'd want to use select - when every bit of performance counts.

Is there any way to work around this and manually generate a combined include-with-select using find_by_sql, or any other method? The trouble is, I'm not aware of any way to emulate the functionality of include, where it instantiates models in memory to hold the included associated models, such that I can enter model1.associated_models and have it not hit the database again.

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