reset_association

# File activerecord/lib/active_record/associations/preloader/through_association.rb, line 62
        def reset_association(owners, association_name)
          should_reset = (through_scope != through_reflection.klass.unscoped) ||
             (reflection.options[:source_type] && through_reflection.collection?)

          # Don't cache the association - we would only be caching a subset
          if should_reset
            owners.each { |owner|
              owner.association(association_name).reset
            }
          end
        end