Scope that has three levels deep joins

Question

My Program table has many Measures My Measure table has many Targets My Target table has a column called \"

Answer 1

What is the target.money of a Program, the sum of all Targets.money of all Measures for this Program ?

You can try something like:

Target.order_by( :money => :desc ).map{|target| target.measure }.map{|measure| measure.program }.uniq

Good luck