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让我们以关联文档中的示例为例：

class Physician < ActiveRecord::Base
  has_many :appointments
  has_many :patients, through: :appointments
end

class Appointment < ActiveRecord::Base
  belongs_to :physician
  belongs_to :patient
end

class Patient < ActiveRecord::Base
  has_many :appointments
  has_many :physicians, through: :appointments
end

我的问题是，假设Appointment模型有一个appointment_date字段，当与新医生和患者一起工作时，我如何才能最优雅地设置它？

现在我的创建解决方案是，而不是使用：

physician = Physician.new(...)
patient = Patient.new(...)
physician.patients < patient
physician.save

我用：

physician = Physician.new(...)
patient = Patient.new(...)
appointment = Appointment.new
appointment.physician = physician
appointment.patient = patient
appointment.appointment_date = Time.now
appointment.save

对于查询，我找到了以下解决方案。

有没有更短/更简洁/“Rails”的方式？

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