Rails多態分配

Question

我已經成功地創建了依賴多態關聯使用accepts_nested_attributes_for，但現在我想分配一個已經存在的多態。我發現了錯誤：

undefined method `id' for {"id"=>"4"}:ActiveSupport::HashWithIndifferentAccess 

型號：

class Person < ActiveRecord::Base 
    has_one :address, :as => :addressable 
end 

class Company < ActiveRecord::Base 
    has_one :address, :as => :addressable 
end 

class Address < ActiveRecord::Base 
    belongs_to :addressable, :polymorphic => true 
end 

查看：

<%= form_for @company do |f| %> 
    <p> 
    <%= f.label :company_name %><br /> 
    <%= f.text_field :company_name %> 
    </p> 

    <%= f.fields_for :address do |f| %> 
    <div class="field"> 
     <%= f.collection_select :id, Address.all, :id, :description, {:prompt => "-Select Address"} %> 
    </div> 
    <% end %> 

產生的PARAMS哈希：

"company"=>{"company_name"=>"myCompanyName", "address"=>{"id"=>"4"}} 

它看起來合理的，我。我究竟做錯了什麼？

Answer 1

變化f.fields_for :address do |f|到f.fields_for :address do |d|和f.collection_select到d.collection_select如果沒有輸錯

<%= form_for @company do |f| %> 
    <p> 
    <%= f.label :company_name %><br /> 
    <%= f.text_field :company_name %> 
    </p> 

    <%= f.fields_for :address do |d| %> 
    <div class="field"> 
     <%= d.collection_select :id, Address.all, :id, :description, {:prompt => "-Select Address"} %> 
    </div> 
    <% end %> 
<% end %> 

Answer 2

你應該能夠添加accepts_nested_attributes_for :address到Person和Company，產生params散列，像這樣：

{"company"=>{"company_name"=>"myCompanyName", "address_attributes"=>{"id"=>"4"}}}