Suppose I have three models: Student, SchoolClass, and DayOfWeek. There is a HABTM relationship between Student and SchoolClass, and between SchoolClass and DayOfWeek. What I'd like to do is find all school classes belonging to a given student that meet on Monday.

Now I suppose I could do something like:

@student = Student.find(:student_id)
@student_classes = @student.school_classes.find(:all)
@student_classes_on_monday = Array.new
@student_classes.each do |student_class|
  if student_class.day_of_week.include?("Monday")
    @student_classes_on_monday << student_class 
  end
end

But there has to be a more elegant way. Can you help me find it?