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I have a class Foo which has_many Bars. Foo has an attribute, some_id. I want to Retrieve all Bar instances where the Foo has some_id = N. In SQL this translates into something like:
select * from bar inner join foo on foo.id = bar.foo_id WHERE foo.some_id = N
It would be something like:
Bar.all :joins => :foo, :conditions => {:foos => {:some_id => N}}