使用更改 django 模板中表单字段的名称属性

我有表单字段{{表单.项目}}这将呈现为

        <input type="text" name="item" >

如何使用自定义模板标签更改表单字段的名称属性？

我尝试将表单发送到模板标签

       form.fields['item'].widget.attrs['name'] = 'new_name'

但我没有取得成功。

我需要更改模板中的名称属性。

UPDATE

模型.py

class A(models.Model):
     name = models.CharField(50)
     type = models.CharField(50)

class B(models.Model):
     field1 = ForeignKeyField(A)
     value = IntegerField()

views.py

 def saving_calculation(request):

    SavingFormset = modelformset_factory(A, extra=2)
    OfferInlineFormSet = inlineformset_factory(
                     A, B,
                     extra = 4
                     )

   if request.method == 'POST':
      pass
   else:
       offer_formset = OfferInlineFormSet()
       saving_formset = SavingFormset(queryset=SavingCalculation.objects.none()) 

   return render_to_response(
       'purchasing/saving_calculation.html',
       {
       'offer_formset':offer_formset,
       'saving_formset':saving_formset,
       }

template

  <form action="." method="POST">
  {{ offer_formset.management_form }}
  {{ saving_formset.management_form }}
  {{ saving_formset.prefix }}
  <table>
 <thead>
    <tr>
        <th>Business Unit</th>
    <th>Category</th>
    <th>Buyer</th>
    <th>Offer1</th>
    <th>Offer2</th>
    <th>Offer3</th>
    <th>Offer4</th>
    </tr>
     </thead>
 <tbody>
        {% for saving in saving_formset.forms %}
     <tr>
    <td>{{saving.businessunit}}</td>
    <td>{{saving.type_of_purchase}}</td>
    <td>{{saving.buyer}}</td>
    {% for offer in offer_formset.forms %}
        <td>{{ offer|set_field_attr:forloop.counter0 }}</td>
    </tr>
        {% endfor %}

     {% endfor %}

      </tbody>
     </table>
     <input type="submit" value="Save" />
    </form>

现在在自定义模板标签中，我需要为内联表单集的每个字段分配新名称

form.fields['new_name'] = form.fields['item']
del form.fields['item']