Accepts_nested_attributes_for 不创建 attr writer 方法答案

【问题标题】：accepts_nested_attributes_for not creating attr writer methodAccepts_nested_attributes_for 不创建 attr writer 方法
【发布时间】：2014-09-26 16:36:28
【问题描述】：

我的担保人将 has_many 地址建模为 :addressable 并接受地址的嵌套属性。但是，当将地址属性列入白名单时，params 哈希无法识别addresses_attributes: [:street, :city, etc.]。我不断收到未经许可的参数地址。有人有这个问题吗？

我的模型：

class UserApplication < ActiveRecord::Base
    belongs_to :user
    has_many :guarantors, dependent: :destroy
    accepts_nested_attributes_for :guarantors
end

class Guarantor < ActiveRecord::Base
has_many :addresses, :as => :addressable, dependent: :destroy
belongs_to :user_application, :foreign_key => :user_application_id
accepts_nested_attributes_for :addresses
end

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

来自用户应用程序控制器

    def user_application_params
  params.require(:user_application).permit(...,
                                           guarantors_attributes: [:id, :fname, :lname, :relationship, :phone, :email, :user_application_id, 
                                            addresses_attributes: [:id, :street, :street_2, :unit, :city, :state, :zip, :addressable_id, :addressable_type]]                                          
                                           )
end

表单的“嵌套”部分：

  <%= f.fields_for :guarantors do |builder| %>
    <div class="row">
      <div class="col-md-1">
        <h6>FIRST NAME</h6>
        <%= builder.text_field :fname, :class => "form-control" %>
      </div>
      <div class="col-md-2">
        <h6>LAST NAME</h6>
        <%= builder.text_field :lname, :class => "form-control" %>
      </div>      
      <div class="col-md-2">
        <h6>RELATIONSHIP</h6>
        <%= builder.text_field :relationship, :class => "form-control" %>
      </div>   
      <div class="col-md-2">
        <h6>PHONE</h6>
        <%= builder.number_field :phone, :class => "form-control" %>
      </div>
      <div class="col-md-2">
        <h6>EMAIL</h6>
        <%= builder.text_field :email, :class => "form-control" %>
      </div>     
    </div>
    <%= f.fields_for :addresses do |builder| %>
        <div class="col-md-1">
          <h6>ADDRESS</h6>
          <%= builder.text_field :street, :class => "form-control" %>
        </div>
        <div class="col-md-2">
          <h6>ADDRESS 2</h6>
          <%= builder.text_field :street_2, :class => "form-control" %>
        </div>      
        <div class="col-md-2">
          <h6>CITY</h6>
          <%= builder.text_field :city, :class => "form-control" %>
        </div>   
        <div class="col-md-2">
          <h6>STATE</h6>
          <%= builder.text_field :state, :class => "form-control" %>
        </div>
        <div class="col-md-2">
          <h6>ZIP</h6>
          <%= builder.number_field :zip, :class => "form-control" %>
        </div>     
      </div> 
    <% end %>
  <% end %>

最后，参数：

"guarantors_attributes"=>{"0"=>{"fname"=>"blah", "lname"=>"", "relationship"=>"", "phone"=>"", "email"=>"", "id"=>"68"}, "1"=>{"fname"=>"", "lname"=>"", "relationship"=>"", "phone"=>"", "email"=>"", "id"=>"69"}}, "addresses"=>{"street"=>"", "street_2"=>"", "city"=>"", "state"=>"", "zip"=>""}, ...

我不断得到未经许可的参数地址，而且它也没有嵌套在 guarantors_attributes 中。有任何想法吗？提前致谢。

【问题讨论】：

在 Guarantor 类的 accepts_nested_attributes_for 中，您不需要 :address 是复数吗？如果这不能解决问题，那么使用表单查看视图会很有帮助，以确保正确设置它以传递键“*_attributes”下的哈希
是的，在您发送消息时编辑问题。复制/粘贴错误，实际上是模型中的 :addresses 。现在将添加表单...

标签： ruby-on-rails-4 nested-attributes

【解决方案1】：

当您构建fields_for :addresses 时，我认为您希望它是builder.fields_for，因为地址嵌套在担保人之下。

f.fields_for :guarantors do |builder|
  # fields
  builder.fields_for :addresses do |builder|
    # fields
  end
end

代码清晰

我还会让块名称更具体，因为有 2 个 builder 变量会让人混淆你所处的范围。

f.fields_for :guarantors do |guarantor_form|
  # fields
  guarantor_form.fields_for :addresses do |address_form|
    # fields
  end
end

【讨论】：

谢谢！ builder.fields_for 是问题所在。并感谢代码清晰提示 - 仍然是新手。