Rails多态别名关联

Question

我想尝试设置此关联：

# app/models/course.rb
class Course < ActiveRecord::Base
  belongs_to :subjectable, polymorphic: true
end

# app/models/student.rb
class Student < ActiveRecord::Base
  has_many :courses, as: :subjectable
end

# app/models/campus.rb
class Campus < ActiveRecord::Base
  has_many :courses, as: :subjectable
end

但这在代码中读起来并不是很好。

#this seems fine
campus = Campus.last
campus.courses 

#this dosent make much sense gramatically 
student = Student.last
student.courses

校园提供课程，但学生没有课程，他们有科目。现在，他们在被子下面是一样的东西，他们只是读得不好。

如何才能使student.subejects产生与student.courses相同的结果