Query in ActiveRecord

I have this relationship

.

How do I query on ActiveRecord to return data for Works , WorkZei and Wi_schools ?

I've tried it like this:

r = Responsible.find(1)

students = r.students

students.each {|s| s.school.joins(:works,:work_zeis).all }

It results in the following error:

NoMethodError: undefined method 'joins'