Problems changing the prefix of a formset in django-CodePudding

I have a question, what happens is that I have a formset and an empty_form (in the same HTML); I have them to do some calculations, for the empty_form I already managed to extract the ID and do operations but not for the formset, and that is that my main problem is that they have the different ID, for example for the formset is like this:

id_form-0-quantity

and for the empty_form it is:

id__form-1-quantity (one more underscore)

but with that different ID I have to make some changes in JS, which I don't want to do because I'm very new in JS and possibly messing up the code more. Is there a way to change the formset prefix to look like this: id__form-0-quantity?;

I used the following line:

formset = ParteFormSet(request.POST, request.FILES, prefix='__form')

But absolutely nothing happens

views

def create_Presupuestos(request):
   extra_forms = 1
   ParteFormSet = formset_factory(PresupuestosParteForm, extra=extra_forms, max_num=20)
   presupuestosclientesform=PresupuestosClientesForm(request.POST or None)
   presupuestosvehiculosform=PresupuestosVehiculosForm(request.POST or None)
   presupuestosparteform=PresupuestosParteForm(request.POST or None)
   presupuestosmanoobraform=PresupuestosManoObraForm(request.POST or None)
   presupuestospagosform=PresupuestosPagosForm(request.POST or None)
   if request.method == 'POST':
       formset = ParteFormSet(request.POST, request.FILES, prefix='__form')
       if formset.is_valid():
           presupuestosclientesform.save()
           return redirect('presupuestos:index')
   else:
       formset = ParteFormSet()
   return render(request,'Presupuestos/new-customer.html',{'presupuestosclientesform':presupuestosclientesform,'presupuestosvehiculosform':presupuestosvehiculosform,'presupuestosparteform':presupuestosparteform,'presupuestosmanoobraform':presupuestosmanoobraform,'presupuestospagosform':presupuestospagosform,'formset':formset})

HTML

                                  <table  id="childTable1">
                                                                                <thead >
                                                                                  <tr>

                                                                                    <th scope="col">Quantity</th>
                                                                                    <th scope="col">Unit Price</th>
                                                                                    </thead>
                                                                                <tbody>
                                                                                {{ formset.management_form }}
                                                                                {% for form in formset %}
                                                                                <div >
                                                                                  <tr>
                                                                                    <td>
                                                                                        {{form.quantity}}
<!--                                                                                      <input type="text" name="parts_quantity"  />-->
                                                                                    </td>
                                                                                    <td>
                                                                                        {{form.unit_price}}
<!--                                                                                      <input type="text" name="parts_unit_price"  />-->
                                                                                    </td>
                                                                                  </tr>
                                                                                </div>
                                                                                {% endfor %}

                                                                                </tbody>

                                                                              </table>

                                                                            <div  id="empty-row">
                                                                                    <table >
                                                                                        <tr>
                                                                                            
                                                                                            <td>{{formset.empty_form.quantity}}</td>
                                                                                            <td>{{formset.empty_form.unit_price}}</td>
                                                                                            
                                                                                        </tr>
                                                                                    </table>
                                                                                  </div>

CodePudding user response：

You should also include the prefix in the case of a GET request, otherwise it will not prefix that form when you load the page for the first time:

def create_Presupuestos(request):
   extra_forms = 1
   ParteFormSet = formset_factory(PresupuestosParteForm, extra=extra_forms, max_num=20)
   presupuestosclientesform=PresupuestosClientesForm(request.POST or None)
   presupuestosvehiculosform=PresupuestosVehiculosForm(request.POST or None)
   presupuestosparteform=PresupuestosParteForm(request.POST or None)
   presupuestosmanoobraform=PresupuestosManoObraForm(request.POST or None)
   presupuestospagosform=PresupuestosPagosForm(request.POST or None)
   if request.method == 'POST':
       formset = ParteFormSet(request.POST, request.FILES, prefix='__form')
       if formset.is_valid():
           presupuestosclientesform.save()
           return redirect('presupuestos:index')
   else:
       # prefix in case of a GET