Django admin action with intermedia page.Django admin 的 action 使用中间页

admin.py

@admin.register(WBS)
class WBSAdmin(admin.ModelAdmin):
    list_display = (
        'id',
        'code',
        'name',
        'parent',
        'pv',
        'ev',
        'created',
        'modified',
    )
    list_filter = ('created', 'modified', 'parent')
    search_fields = ('name',)
    list_editable = ('parent', 'pv', 'ev')
    ordering = ('-id',)
    actions = ['do_batch_update_code']

    def do_batch_update_parent(self, request, qs):
        """批量更新父任务"""
        if 'apply' in request.POST:
            parent_id = request.POST.get('parent_id')
            qs.update(parent_id=parent_id)
            self.message_user(request, f'选择的任务的父级任务已经设置为：{parent_id}')
            return HttpResponseRedirect(reverse('admin:djpmp_wbs_changelist'))
        context = {
            'title': '选择父级任务',
            'tasks': m.WBS.objects.all(),
            'task_selected': qs
        }
        return render(request, 'admin/djpmp/wbs/batch-update-parent.html', context=context)

batch-update-code.html

{% extends 'admin/base_site.html' %}
{% load i18n admin_urls static admin_list %}
{% load mptt_tags %}

{% block content %}

    <form action="" method="POST">
        {% csrf_token %}
        <div>
            <fieldset class="module aligned">
                <div class="form-row">
                    <div>
                        <label>
                            <h3>以下任务：</h3>
                        </label>
                        <ul style="list-style-type: none;">
                            {% for task in task_selected %}
                                <li style="">
                                    {{ task.name }}
                                    <input type="hidden" name="_selected_action" value="{{ task.pk }}"/>
                                </li>
                            {% endfor %}
                        </ul>
                    </div>
                </div>
                <div class="form-row">
                    <div>
                        <label class="required" for="parent_id">
                            <h3>父级任务设置为：</h3>
                        </label>
                        <ul style="list-style-type: none;">
                            {% recursetree tasks %}
                                <li style="list-style-type: none">
                                    <label>
                                        <input type="radio" id="parent_id" name="parent_id" value="{{ node.pk }}">
                                        &nbsp; {{ node.name }}
                                    </label>

                                    {% if not node.is_leaf_node %}
                                        <ul class="children" style="list-style-type: none;">
                                            {{ children }}
                                        </ul>
                                    {% endif %}
                                </li>
                            {% endrecursetree %}
                        </ul>
                    </div>
                </div>

            </fieldset>


            <div class="submit-row">
                <input type="hidden" name="action" value="do_batch_update_parent"/>
                <input type="submit" name="apply" value="提交"/> &nbsp
                <button type="button" name="cancel" onclick="history.back(-1);" class="module">取消</button>
            </div>

        </div>

    </form>

{% endblock %}