從另一個模型

Question

註冊用戶每個User只能有一個MedicalHistory所以我有

class User < ActiveRecord::Base 
    acts_as_authentic 
end 

class MedicalHistory < ActiveRecord::Base 
    belongs_to :user 
end 

使用上面我可以成功地創建從MedicalHistory模式在控制檯的用戶：

newuser = Medicalhistory.new 
newuser.user = User.new 
newuser.user.username='testusername' 
newuser.user.password='blahblah' 
newuser.user.password_confirmation='blahblah' 
newuser.user.save 

MedicalHistory面貌如下

#controller 
def new 
    @medicalhistory = MedicalHistory.new 
    @medicalhistory.user = User.new 
end 

#form 
<%=...%> 
<%=f.intput :cell_phone%> 
<%=f.fields_for :user do |builder|%> 
    <%= render "registration_form", :f => builder %> 
<% end %> 

#Partial 
<%=f.input :email%> 
<%=f.input :password%> 
<%=f.input :password_confirmation%> 

錯誤

當提交我收到以下錯誤形式：

User(#-) expected, got ActiveSupport::HashWithIndifferentAccess(#) 

錯誤是以下行：

#controller 
def create 
    @medicalhistory = Medicalhistory.new(session[:medicalhistory_params]) #gives error 
    #somewhere here I should extract registration fields and register the user 
end 

問題 有沒有一種方法可以讓我避免領域在部分（註冊字段）進入session[:medicalhistory_params] ...有沒有except什麼？

Answer 1

更改模型如下：

class MedicalHistory < ActiveRecord::Base 
    belongs_to :user 
    accepts_nested_attributes_for :user 
end 

參考這裏：http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html

Answer 2

有沒有理由不在#create中使用類似params[:medical_history]的東西？

Answer 3

你可能想看看進入accepts_nested_attributes_for

見本作的介紹 http://ryandaigle.com/articles/2009/2/1/what-s-new-in-edge-rails-nested-attributes