我有 2 个模型,Teacher和TeacherLeader:
# id :integer
# last_name :string(255)
class Teacher < ActiveRecord::Base
has_one :teacher_leader
end
# teacher_id :integer
class TeacherLeader < ActiveRecord::Base
belongs_to :teacher
end
我想找到所有担任教师领导的教师,并通过last_name
. 我怎样才能做到这一点?