基于Django类的视图分页不起作用

from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger

from django.views.generic import ListView
from myapp.models import MyModel

class MyModelListView(ListView):
    model = MyModel
    template_name = 'myapp/mymodel_list.html'
    context_object_name = 'mymodels'
    paginate_by = 10  # 每页显示10条记录

    def get_context_data(self, **kwargs):
        context = super().get_context_data(**kwargs)
        paginator = context['paginator']
        page_obj = context['page_obj']
        is_paginated = context['is_paginated']

        # 添加自定义分页信息到上下文中
        context['custom_pagination_info'] = {
            'has_previous': page_obj.has_previous(),
            'previous_page_number': page_obj.previous_page_number() if page_obj.has_previous() else None,
            'has_next': page_obj.has_next(),
            'next_page_number': page_obj.next_page_number() if page_obj.has_next() else None,
            'num_pages': paginator.num_pages,
        }

        return context

{% if is_paginated %}
<nav aria-label="Page navigation">
  <ul class="pagination">
    {% if page_obj.has_previous %}
      <li class="page-item"><a class="page-link" href="?page={{ page_obj.previous_page_number }}">Previous</a></li>
    {% endif %}
    {% for num in page_obj.paginator.page_range %}
      <li class="page-item {% if page_obj.number == num %}active{% endif %}">
        <a class="page-link" href="?page={{ num }}">{{ num }}</a>
      </li>
    {% endfor %}
    {% if page_obj.has_next %}
      <li class="page-item"><a class="page-link" href="?page={{ page_obj.next_page_number }}">Next</a></li>
    {% endif %}
  </ul>
</nav>
{% endif %}

from django.urls import path
from myapp.views import MyModelListView

urlpatterns = [
    path('mymodels/', MyModelListView.as_view(), name='mymodel-list'),
]