ruby-on-rails - Rails 多态赋值

Question

我已经使用 成功创建了依赖的多态关联accepts_nested_attributes_for，但现在我想分配一个已经存在的多态。我收到错误：

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

楷模：

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

看法：

<%= 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 %>

生成的参数哈希是：

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

这在我看来是合理的。我究竟做错了什么？

Answer 1

如果没有输入错误，则更f.fields_for :address do |f|改为f.fields_for :address do |d|和f.collection_selectd.collection_select

<%= 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

您应该能够添加accepts_nested_attributes_for :address到Personand Company，这会产生如下的 params 散列：

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