问mongoengine 对某一字段进行查询？

models
class TypeInfo(Document):
    title = StringField(max_length=20)
    isDelete = BooleanField(default=False)
    t_image = ImageField()
    

def good(request):
    type2 = TypeInfo.objects.only('title')#获得title的全部数据
    context = {'type': type2}
    return render(request, 'manage/goods_site.html', context)

                        <div class="form_group form_group3">
                            <label>类别：</label>
                            {%for g in type%}
                            <input type="radio" name="gtype" value="{{g}}">{{g}}
                                {% empty %}
                               <li>nothing</li>
                            {%endfor%}<!-—for为空 --!>
                        </div>