ruby-on-rails - How to allow assign only users with specified role?

Question

I have User model with CanCan authorisation.

So user have role attribute from this array: => ['doctor', 'patient']

class Shift < ActiveRecord::Base
  belongs_to :doctor, class_name: "User", foreign_key: :user_id
  belongs_to :day

  validates :shift, presence: true
  validates :cardiologist, presence: true
end

How should I write validator to allow create Shifts only for doctors and not allow to create shift where user_id attribute is not a patient id?

Answer 1

您应该编写自定义验证方法。像这样的东西应该为你做。

validate :check_doctor
def check_doctor
  errors.add(:doctor, "User is not a doctor") unless self.doctor && self.doctor.role == "doctor" 
end

Answer 2

尝试这个：

validate :check_for_patient

private
  def check_for_patient
    errors.add(:base, 'error message') if self.doctor && self.doctor.role == 'patient'
  end

Answer 3

好吧，自定义检查器（就像其他答案一样）可以正常工作，但请考虑将User系统中的概念和角色分开。如果有人Doctor想成为一个Patient怎么办？

Doctors也许为and创建单独的表Patients？

因此，很容易实施您的检查。即不可能Shift为Patient...创建

使用 STI（单表继承）方法，处理这样的事情很快就会变得混乱（处理太多）。