joins(:group_memberships_as_member).
            group("#{quoted_table_name}.#{connection.quote_column_name('id')}").
            merge(Groupify.group_membership_klass.where(group_id: groups)).
            having("COUNT(DISTINCT #{Groupify.group_membership_klass.quoted_table_name}.#{connection.quote_column_name('group_id')}) = ?", groups.count).