Question

我已经成功地使用accepts_nested_attributes_for创建了依赖多态关联，但现在我想分配一个已经存在的多态。我得到错误：

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

型号：

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

视图：

<%= 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params哈希为：

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

这在我看来是合理的。我做错了什么？

Answer 1

将f.fields_for:address do|f|更改为f.fields_for:address do|d|f.collection_select改为d.collection_sect

<%= 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

您应该能够将accepts_nested_attributes_for:address添加到Person和Company，从而生成如下参数哈希：

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

友情链接