blah.rb

signups = cuco_session.course_signups.includes(:course_role, :course).where(person: family.people)      
count = signups.where(person_id: person.id).joins(:course).where(courses: { period_id: period.id }).count


##
x = cuco_session.course_signups
y = x.includes(:course_role, :course)
signups = y.where(person: family.people)      

a = signups.where(person_id: person.id)
b = a.joins(:course)
c = b.where(courses: { period_id: period.id })
count = c.count