如何在ListView中按Post参数进行筛选

# views.py
from django.views.generic import ListView
from .models import Item

class ItemListView(ListView):
    model = Item
    template_name = 'item_list.html'

    def get_queryset(self):
        queryset = super().get_queryset()
        
        # 获取筛选条件
        keyword = self.request.POST.get('keyword')
        category = self.request.POST.get('category')

        # 对筛选条件进行逻辑判断，并构建查询集
        if keyword:
            queryset = queryset.filter(title__contains=keyword)
        
        if category:
            queryset = queryset.filter(category=category)
        
        return queryset

<!-- item_list.html -->
<form method="POST" action="{% url 'item-list' %}">
  {% csrf_token %}
  <input type="text" name="keyword" placeholder="关键字">
  <select name="category">
    <option value="">全部分类</option>
    <option value="1">分类1</option>
    <option value="2">分类2</option>
  </select>
  <button type="submit">筛选</button>
</form>

<ul>
  {% for item in object_list %}
    <li>{{ item.title }}</li>
  {% endfor %}
</ul>