sti和has_many in rails

Question

register < user 

admin < user 

class project 
    has_many :admin, :class => 'User', :conditions => "type = 'admin'" 
    has_many :registers, :class => 'User', :conditions => "type = 'registers'" 

這裏的問題是，當我使用項目has_many創建一個註冊或管理員，它不會自動填充對象類到類型字段。

像這樣：project.admins.new。

如何解決這個問題？

Answer 1

你應該能夠直接指定has_many關係，而不需要告訴Rails該類是User。像這樣：

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