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我在我的第一个Django项目中遇到了一些麻烦。我有一个ListView，其中有几个组合框（选择）来过滤表中的数据。我使用基金会为我的网站我遇到的问题是，一旦我建立了“过滤器”在我的组合框中，数据呈现良好，但加载表后，选择之一是没有加载正确的选项（最后一次查找）
这是我的ListView代码：

class ListSales(LoginRequiredMixin, ListView):
    template_name = "sales/list.html"
    context_object_name = 'sales'
    login_url = reverse_lazy('users_app:user-login')
    paginate_by = 5

    def get_queryset(self):
        client = self.request.GET.get("clientselect", "")
        payment_method = self.request.GET.get("paymentselect", "")
        date1 = self.request.GET.get("date1", '')
        date2 = self.request.GET.get("date2", '')
        product = self.request.GET.get("productselect", '')

        if date1 == '':
            date1 = datetime.date.today()
        if date2 == '':
            date2 = datetime.date.today()
        queryset = Sale.objects.get_sales_list(
            date1, date2, client, payment_method)

        qty_total_product = 0
        if product != '0' and product != '':

            print(Product.objects.get(id=product).full_name)
            print(queryset)
            for querysale in queryset:
                print(querysale)
                for query_sale_detail in querysale.sale_details():
                    print(query_sale_detail.product.full_name +
                          "  " + str(query_sale_detail.count))
                    if str(query_sale_detail.product.id) == product:
                        qty_total_product += query_sale_detail.count

        print(qty_total_product)
        obj_sales_list_filter, created_obj_sales_list_filter = SalesListFilters.objects.get_or_create(
            id=1,
            defaults={
                'datefrom': date1,
                'dateTo': date2,
                'client': Client.objects.search_id(client),
                'payment_method': PaymentMethod.objects.search_id(payment_method)
            })
        if not created_obj_sales_list_filter:
            obj_sales_list_filter.datefrom = date1
            obj_sales_list_filter.dateTo = date2
            obj_sales_list_filter.client = Client.objects.search_id(client)
            obj_sales_list_filter.payment_method = PaymentMethod.objects.search_id(
                payment_method)
            obj_sales_list_filter.save()

        return queryset

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)

        context["clients"] = Client.objects.all().order_by('full_name')
        context["payment_methods"] = PaymentMethod.objects.all()
        context["products"] = Product.objects.all().order_by('full_name')
        sales_list_filters = SalesListFilters.objects.all()
        if sales_list_filters is None or sales_list_filters == {} or not sales_list_filters:
            context["date1"] = str(datetime.date.today())
            context["date2"] = str(datetime.date.today())
        else:
            sales_list_filters = SalesListFilters.objects.get(id=1)
            context["date1"] = str(sales_list_filters.datefrom)
            context["date2"] = str(sales_list_filters.dateTo)
            if(sales_list_filters.client is None):
                context["clientselect"] = 0
            else:
                context["clientselect"] = sales_list_filters.client.id

            if(sales_list_filters.payment_method is None):
                context["paymentselect"] = 0
            else:
                context["paymentselect"] = sales_list_filters.payment_method.id

        current_sale_info = CurrentSaleInfo.objects.get(id=1)
        if current_sale_info is None or current_sale_info == {} or current_sale_info.invoice_number is None:
            context["current_sale_info"] = False
        else:
            context["current_sale_info"] = True

        product = self.request.GET.get("productselect", '')
        print("el producto seleccionado es:"+product+"  "+str(type(product)))
        if(product == '' or product == '0'):
            print("Entro por defecto")
            context["product_select"] = 0
        else:
            print("Entro por valor")
            context["product_select"] = int(product)

        return context

我可以在**kwargs中看到为productselect建立的变量加载正常。但是，当我设置context[“product_select”]变量时，html总是加载选项0。
这是我的html：

{% extends "panel.html" %}

{% load  static %}

{% block panel-content %}

<div class="grid-x medium-10">
    <h3 class="cell medium-12" style="text-align: center;">Ventas</h3> 
    <div class="cell medium-12">&nbsp </div>
    <form class="cell medium-12" method="GET">{% csrf_token %}
        <div class="input-group grid-x medium-12">
            
            <div class="input-group cell medium-2 grid-x">
                <label class="cell medium-12">Desde:</label>
                <span class="input-group-label"><i class="fi-calendar"></i></span>
                <input type="date" id="date1" name="date1" class="input-group-field" type="date" value={{date1}}>
                
            </div>
            &nbsp&nbsp&nbsp
            <div class="input-group cell medium-2 grid-x">
                <label class="cell medium-12">Hasta:</label>
                <span class="input-group-label"><i class="fi-calendar"></i></span>
                <input type="date" id="date2" name="date2" class="input-group-field" type="date" value={{date2}}>
                
            </div>
            &nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp
            <div class="input-group cell medium-2 grid-x">
                <label class="cell medium-12">Cliente:</label>
                <span class="input-group-label"><i class="fi-torso"></i></span>
                <select id="clientselect" name="clientselect" class="input-group-field">
                    <option value="0" id="option0" name="option0" {% if clientselect is 0 %} selected {% endif %}>Todos</option>
                    <option value="-1" id="option-1" name="option-1" {% if clientselect is -1 %} selected {% endif %}>Sin Cliente</option>
                    {% for client in clients %}
                    <option value="{{client.pk}}" id="option{{client.pk}} "  name="option{{client.pk}}" {% if clientselect is client.pk %} selected {% endif %}>{{client.full_name}}</option>
                    {% endfor %}
                </select>
                
            </div>

            &nbsp&nbsp&nbsp
            <div class="input-group cell medium-2 grid-x">
                <label class="cell medium-12">Método de Pago:</label>
                <span class="input-group-label"><i class="fi-dollar-bill"></i></span>
                <select id="paymentselect" name="paymentselect" class="input-group-field">
                    <option value="0" id="option0" name="option0" {% if paymentselect is 0 %} selected {% endif %}>Todos</option>
                    {% for pm in payment_methods %}
                    <option value="{{pm.pk}}" id="option{{pm.pk}} "  name="option{{pm.pk}}" {% if paymentselect is pm.pk %} selected {% endif %}>{{pm.full_name}}</option>
                    {% endfor %}
                </select>
                
            </div>

            &nbsp&nbsp&nbsp
            <div class="input-group cell medium-3 grid-x">
                <label class="cell medium-12">Producto:</label>
                <span class="input-group-label"><i class="fi-list"></i></span>
                <select id="productselect" name="productselect" class="input-group-field">
                    <option value="0" id="option0" name="option0" {% if product_select is 0 %} selected {% endif %}>Todos</option>
                    {% for prod in products %}
                    <option value="{{prod.pk}}" id="option{{prod.pk}} "  name="option{{prod.pk}}" {% if product_select is prod.pk %} selected {% endif %}>{{prod.full_name}}</option>
                    {% endfor %}
                </select>
                
            </div>

 
            <div class="cell medium-1">
                <button type="submit" class="button cell medium-4"><i class="fi-filter"></i>&nbsp Filtrar</button>
            </div>

            <div class="cell medium-1">
                <h5>{{product_text}}</h5>
            </div>
            
        </div>
    </form>
    <div class="cell medium-12"> </div>
    <table class="cell medium-12">
        <thead>
            <th>Fecha</th>
            <th>Nro Factura</th>
            <th>Cliente</a></th>
            <th>Método de Pago</a></th>            
            <th>Monto</th>
            <th>Acciones</th>
         
        </thead>
        <tbody>
          {% for sale in sales %}
            <tr>
                
              <td>{{ sale.show_date }}</td>
              <td>{{ sale.invoice_number }}</td>
              <td>{{ sale.client.full_name }}</td>
              <td>{{ sale.payment_method }}</td>
              <td>${{ sale.amount_with_discount}}</td>
              <td>
              <div class="button-group">
                <a href="#" class="button warning tiny" data-toggle="modalView{{sale.pk}}"><i class="fi-eye"></i></a>
                
            </td>
              </div>

            </tr>

        
            <div class="tiny reveal" id="modalView{{sale.pk}}" style="background-color:rgb(51,51,51);" data-reveal data-close-on-click="true" data-animation-in="spin-in" data-animation-out="spin-out">
                <h4 class="cell" style="text-align: center;">Detalle de Venta</h4>
                <br>
                {% for sale_detail in sale.sale_details %}
                    <h5 style="text-align: center;">{{sale_detail.product.full_name}} X {{sale_detail.count}} : $ {{sale_detail.sale_detail_total}}</h5>
                {% endfor %}
                <h5 style="text-align: center;">--------------------------------------------------</h5>
                <h5 style="text-align: center;">SUB TOTAL: $ {{sale.amount}}</h5>
                <h5 style="text-align: center;">DESCUENTO: $ {{sale.discount}}</h5>
                <h4 style="text-align: center;" class="detailtag">TOTAL: $ {{sale.amount_with_discount}}</h5>
                <button class="close-button" data-close aria-label="Close modal" type="button">
                <span aria-hidden="true">&times;</span>
                </button> 
    
                
            </div>

          {% endfor %}
        </tbody>
    </table>    

    {% if is_paginated %}
    <ul class="pagination cell medium-12">
      {% if page_obj.has_previous %}
      <li><a href="?page={{ page_obj.previous_page_number }}&{{ view.urlencode_filter }}" style="color: wheat;">&laquo;</a></li>
      {% else %}
      <li class="disabled"><span style="color: wheat;">&laquo;</span></li>
      {% endif %} {% for i in paginator.page_range %} {% if page_obj.number == i %}
      <li class="active">
        <span style="color: wheat;">{{ i }} <span class="sr-only">(actual)</span></span>
      </li>
      {% else %}
      <li><a href="?page={{ i }}&{{ view.urlencode_filter }}" style="color: wheat;">{{ i }}</a></li>
      {% endif %} {% endfor %} {% if page_obj.has_next %}
      <li><a href="?page={{ page_obj.next_page_number }}&{{ view.urlencode_filter }}" style="color: wheat;">&raquo;</a></li>
      {% else %}
      <li class="disabled"><span style="color: wheat;">&raquo;</span></li>
      {% endif %}
    </ul>
    {% endif %}

  </div>

  
  
  {% endblock panel-content %}

这是一个图片显示，是加载每一个选择，但没有一个产品。它总是加载产品“Todos”，这是第一个选项：