Question

我正在使用Ryan Bates nested_form gem（https://github.com/ryanb/nested_form）并在格式化“编辑”表单上的值时遇到问题。

我目前正在我的一些“非嵌套”表单字段中使用它，效果很好！但是当我在其中一个嵌套元素上以相同的方式格式化时，我得到一个'未定义的方法错误'

代码处理“非嵌套字段”

value: number_with_delimiter(f.object.reserve_price, precision: 2)

编辑中的嵌套表单字段

<div id="products">
          <%= f.fields_for :products, :wrapper => false do |product_form| %>
            <div class="form-group">
                <div class="input-group col-md-4">
                    <div class="input-group-addon">$</div>
                <%= product_form.text_field :retail_weekly_price, class: "form-control", placeholder: 'Retail Weekly Rate Card', required: true, (***add value call results in error***) %>
               <div class="input-group-addon">.00</div>
            </div>
            </div>
          </div>
          <% end %>
        </div>

添加了错误日志

ActionView::Template::Error (undefined method `retail_weekly_price' for #<Location:0x007fd46baa35b0>):
   160:                 <div class="form-group">
   161:                     <div class="input-group col-md-4">
   162:                         <div class="input-group-addon">$</div>
   163:                     <%= product_form.text_field :retail_weekly_price, class: "form-control", placeholder: 'Retail Weekly Rate Card', required: true, value: number_with_currency(f.object.retail_weekly_price, precision: 2) %>
   164:                    <div class="input-group-addon">.00</div>
   165:                 </div>
   166:                 </div>
   app/views/locations/_edit_form.html.erb:163:in `block (2 levels) in    _app_views_locations__edit_form_html_erb__1967616523010840695_70275187628360'
   app/views/locations/_edit_form.html.erb:137:in `block in   _app_views_locations__edit_form_html_erb__1967616523010840695_70275187628360'
   app/views/locations/_edit_form.html.erb:1:in `_app_views_locations__edit_form_html_erb__1967616523010840695_70275187628360'
   app/views/locations/edit.html.erb:1:in `_app_views_locations_edit_html_erb__1956197158500275006_70275237765300'

Answer 1

使用

value: number_to_currency(product_form.object.retail_weekly_price, precision: 2)

而不是

value: number_with_currency(f.object.retail_weekly_price, precision: 2)

由于retail_weekly_price字段位于products表格中。

f.object将返回您在Location中引用的nested_form_for的实例，而retail_weekly_price表中不存在locations字段，您会收到错误

undefined method 'retail_weekly_price' for #<Location

product_form.object会返回Product中引用的fields_for个实例。通过它访问retail_weekly_price字段不会有任何问题。

此外，ActionView 辅助方法名称为number_to_currency而非number_with_currency

嵌套表单中带分隔符的格式值

1 个答案: