ruby-on-rails - 无法保存普通的旧多对一嵌套表单

Question

我使用的是 Rails 3。我有一个模型 Client，它有一个 address_id。在我的 Client 表单中，我嵌套了 Address 字段。这是表单的 Address 部分:

  <%= f.fields_for @client.address do |address_form| %>
    <div class="field">
      <%= address_form.label :line1 %><br />
      <%= address_form.text_field :line1 %>
    </div>
    <div class="field">
      <%= address_form.label :line2 %><br />
      <%= address_form.text_field :line2 %>
    </div>
    <div class="field">
      <%= address_form.label :city %><br />
      <%= address_form.text_field :city %>
    </div>
    <div class="field">
      <%= address_form.label :state_id %><br />
      <%= select("client[address]", "state_id", State.all.collect {|s| [ s.name, s.id ] }) %>
    </div>
    <div class="field">
      <%= address_form.label :zip %><br />
      <%= address_form.text_field :zip %>
    </div>
  <% end %>

当我尝试保存表单时，我得到以下信息:

Address(#23652762896420) expected, got ActiveSupport::HashWithIndifferentAccess(#23652751466220)

我不明白这到底意味着什么，也不明白为什么我会得到它。 params.inspect 如下所示:

{"commit"=>"Update Client",
 "authenticity_token"=>"CBw1fQcsUtXs9x6lKTL4zeoekX1cwuFUrZvZpCShHIc=",
 "_method"=>"put",
 "utf8"=>"\342\234\223",
 "action"=>"update",
 "id"=>"16",
 "client"=>{"name"=>"Rosie O'Donnell",
            "address"=>{"city"=>"Grand Rapids",
                        "line1"=>"216 Grandville Ave SW",
                        "zip"=>"49503",
                        "line2"=>"",
                        "state_id"=>"1"},
            "phone"=>"",
            "salon_id"=>"1",
            "email"=>""},
 "controller"=>"clients"}

有人可以告诉我发生了什么事吗？

Answer 1

请参见此处:http://guides.rubyonrails.org/2_3_release_notes.html#nested-object-forms (这是一篇 Rails 2.3 文章，但它也应该适用于 Rails 3)

在您的 Client 中您需要此行的型号:

accepts_nested_attributes_for :address

此外，将嵌套表单的第一行更改为:

<%= f.fields_for :address do |address_form| %>