ruby-on-rails - rails 中的 sti 和 has_many

Question

class Register < User
end

class Admin < User
end

class Project < ActiveRecord::Base
  has_many :admin, :class => 'User', :conditions => "type = 'admin'"
  has_many :registers, :class => 'User', :conditions => "type = 'registers'"
end

这里的问题是，当我使用项目 has_many 创建注册或管理员时，它不会自动将对象类填充到类型文件中。

像这样: project.admins.new .

如何解决这个问题？

Answer 1

您应该能够直接指定 has_many 关系，而无需告诉 Rails 该类是 User。像这样:

class User < ActiveRecord::Base
  belongs_to :project
end

class Register < User    
end

class Admin < User
end

class Project < ActiveRecord::Base
  has_many :admins
  has_many :registers

  def make_new_admin
    ad = admins.create(:name => "Bob")
    # ad.type => "Admin"
  end
end